Abstract:
Disclosed herein is a carbonated water producing apparatus which guides a replacement of a cylinder using sound generated when carbon dioxide is supplied from the cylinder, and a refrigerator having the same. In accordance with one aspect of the present disclosure, a carbonated water producing apparatus comprising: a carbonated water producing unit including a cylinder configured to store carbon dioxide and configured to supply the carbon dioxide to a container; a microphone configured to obtain sound generated in the carbonated water producing unit; a filter configured to pass a signal having a frequency of a predetermined cutoff frequency or more of signals obtained by the microphone; a user interface unit configured to display information related to carbonated water production; and a controller configured to obtain the sound generated in the carbonated water producing unit by driving the microphone when the carbonated water producing unit operates, and configured to display a message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when an intensity of a signal passing through the filter is less than a predetermined reference value.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2015-0153848, filed on Nov. 3, 2015 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       TECHNICAL FIELD 
       [0002]    Embodiments of the present disclosure relate to a carbonated water producing apparatus for producing and supplying carbonated water, a refrigerator having the same, and a method of controlling the same. 
       BACKGROUND 
       [0003]    A refrigerator is an apparatus which keeps stored goods such as food, beverages, and the like in a fresh state for a long time, and includes a storage compartment, which may keep stored goods in a frozen or refrigerated state, and a machine compartment including a compressor, a condenser, an expansion valve, an evaporator, and the like which perform a refrigeration cycle of compression-condensation-expansion-evaporation. 
         [0004]    The refrigerator maintains a temperature in the storage compartment at a freezing temperature or a refrigerating temperature using cold air which exchanges heat in the evaporation process of the refrigeration cycle. 
         [0005]    Recently, with improvement in living standards, a capacity of a refrigerator is expanding in order to keep a large amount and a variety of stored goods, and functionality thereof is being diversified in order to improve a user&#39;s convenience. 
         [0006]    In response to a user&#39;s demand, the refrigerator may include an ice-making device which generates ice, and a dispenser through which water or ice is withdrawn to the outside without opening a door. 
       SUMMARY 
       [0007]    Therefore, it is an aspect of the present disclosure to provide a carbonated water producing apparatus which guides a replacement of a cylinder using sound generated when carbon dioxide is supplied from the cylinder, and a refrigerator having the same. 
         [0008]    In accordance with one aspect of the present disclosure, a carbonated water producing apparatus comprising: a carbonated water producing unit including a cylinder configured to store carbon dioxide and configured to supply the carbon dioxide to a container; a microphone configured to obtain sound generated in the carbonated water producing unit; a filter configured to pass a signal having a frequency of a predetermined cutoff frequency or more of signals obtained by the microphone; a user interface unit configured to display information related to carbonated water production; and a controller configured to obtain the sound generated in the carbonated water producing unit by driving the microphone when the carbonated water producing unit operates, and configured to display a message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when an intensity of a signal passing through the filter is less than a predetermined reference value. 
         [0009]    The controller displays the message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when the intensity of the signal passing through the filter is less than the predetermined reference value and the carbon dioxide is supplied from the carbonated water producing unit to the container. 
         [0010]    The carbonated water producing unit includes an interrupter configured to interrupt a supply of the carbon dioxide and a hall sensor configured to detect an operating state of the interrupter; and the controller displays the message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when the intensity of the signal passing through the filter is less than the predetermined reference value and an operation of the interrupter is detected by the hall sensor. 
         [0011]    The controller operates the microphone when a carbonated water production command is input through the user interface unit. 
         [0012]    The carbonated water producing unit includes an interrupter configured to interrupt a supply of the carbon dioxide; and the controller operates the microphone when the interrupter operates. 
         [0013]    The controller calculates a root mean square (RMS) value of the signal passing through the filter, and displays the message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when the calculated RMS value is less than the predetermined reference value. 
         [0014]    The microphone includes a first microphone and a second microphone which are spaced a predetermined distance apart; and the apparatus further comprises a beamformer configured to remove a phase difference between sound signals obtained by the first microphone and the second microphone and then to sum the sound signals. 
         [0015]    The filter passes a signal having a frequency of the predetermined cutoff frequency or more of the sound signals summed by the beamformer. 
         [0016]    In accordance with one aspect of the present disclosure, a refrigerator comprising: a carbonated water producing unit including a cylinder configured to store carbon dioxide and configured to supply the carbon dioxide to a container; a dispenser provided in a door and including a discharge port configured to discharge carbon dioxide supplied from the carbonated water producing unit and having the container detachably provided therein; a microphone configured to obtain sound generated in the carbonated water producing unit; a filter configured to pass a signal having a frequency of a predetermined cutoff frequency or more of signals obtained by the microphone; a user interface unit configured to display information related to carbonated water production; and a controller configured to obtain the sound generated in the carbonated water producing unit by driving the microphone when the carbonated water producing unit operates, and configured to display a message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when an intensity of a signal passing through the filter is less than a predetermined reference value. 
         [0017]    The controller displays the message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when the intensity of the signal passing through the filter is less than the predetermined reference value and the carbon dioxide is supplied from the carbonated water producing unit to the container. 
         [0018]    The carbonated water producing unit includes an interrupter configured to interrupt a supply of the carbon dioxide; and the controller operates the microphone when the interrupter operates. 
         [0019]    The microphone includes a first microphone and a second microphone which are spaced a predetermined distance apart; and the refrigerator further comprises a beamformer configured to remove a phase difference between sound signals obtained by the first microphone and the second microphone and then to sum the sound signals. 
         [0020]    The filter passes a signal having a frequency of the predetermined cutoff frequency or more of the sound signals summed by the beamformer. 
         [0021]    In accordance with one aspect of the present disclosure, a method of controlling a refrigerator, the method comprising: obtaining a sound generated in a carbonated water producing unit by driving a microphone when the carbonated water producing unit operates; separating, by a filter, a signal having a frequency of a predetermined cutoff frequency or more of obtained sound signals; displaying a message which requests that a cylinder which stores carbon dioxide be replaced on a user interface unit when an intensity of the separated signal is less than a predetermined reference value. 
         [0022]    The displaying of the message which requests that the cylinder be replaced on the user interface unit includes displaying the message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when an intensity of a signal passing through the filter is less than the predetermined reference value and the carbon dioxide is supplied from the carbonated water producing unit to the container. 
         [0023]    The displaying of the message which requests that the cylinder be replaced on the user interface unit includes displaying the message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when an intensity of a signal passing through the filter is less than the predetermined reference value and an operation of an interrupter is detected by a hall sensor. 
         [0024]    The obtaining of the sound generated in the carbonated water producing unit by driving the microphone includes operating the microphone when an interrupter operates. 
         [0025]    The displaying of the message which requests that the cylinder be replaced on the user interface unit includes: calculating an RMS value of a signal passing through the filter; and displaying the message which requests that the cylinder which stores the carbon dioxide be replaced on the user interface unit when the calculated RMS value is less than the predetermined reference value. 
         [0026]    The microphone includes a first microphone and a second microphone which are spaced a predetermined distance apart; and 
         [0027]    The method further comprises removing, by a beamformer, a phase difference between sound signals obtained by the first microphone and the second microphone and then summing the sound signals. 
         [0028]    The separating of the signal having a frequency of the predetermined cutoff frequency or more of the obtained sound signals by the filter includes passing, by the filter, a signal having a frequency of the predetermined cutoff frequency or more of the sound signals summed by the beamformer. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0029]    These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
           [0030]      FIG. 1  is a perspective view of a refrigerator according to one embodiment. 
           [0031]      FIG. 2  is a view of an exemplary inside of the refrigerator according to one embodiment. 
           [0032]      FIG. 3  is a front view of the dispenser provided in the refrigerator according to one embodiment. 
           [0033]      FIG. 4  is a cross-sectional view of the dispenser illustrated in  FIG. 3 . 
           [0034]      FIG. 5  is a view of an exemplary container fastened to the dispenser illustrated in  FIG. 3 . 
           [0035]      FIG. 6  is a view of a fastening structure of the carbonated water producing apparatus and the container of the dispenser illustrated in  FIG. 5 . 
           [0036]      FIG. 7  is a schematic diagram of the carbonated water producing apparatus according to one embodiment. 
           [0037]      FIG. 8  is a control block diagram of the refrigerator according to one embodiment. 
           [0038]      FIGS. 9, 10   a  and  10   b  are a view of an exemplary user interface unit of the refrigerator according to one embodiment. 
           [0039]      FIG. 11  is a block diagram illustrating a configuration of the sound obtainer of the refrigerator according to one embodiment. 
           [0040]      FIG. 12  is a flowchart illustrating a method of controlling the refrigerator according to one embodiment. 
           [0041]      FIG. 13  is a block diagram illustrating a configuration of a sound obtainer of a refrigerator according to another embodiment. 
           [0042]      FIG. 14  is a view conceptually illustrating beamforming of a sound signal obtained by the sound obtainer of the refrigerator according to another embodiment. 
           [0043]      FIG. 15  is a flowchart illustrating a method of controlling the refrigerator according to another embodiment. 
       
    
    
     DETAILED DESCRIPTION 
       [0044]    Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. 
         [0045]      FIG. 1  is a perspective view of a refrigerator according to one embodiment, and  FIG. 2  is a view of an exemplary inside of the refrigerator according to one embodiment. 
         [0046]    As illustrated in  FIG. 1 , a refrigerator  1  includes a main body  100 , which forms an exterior thereof and is provided with a storage compartment  110  and a machine compartment  120  therein, and a dispenser  200  which supplies water, ice, and carbon dioxide and water for producing carbonated water. 
         [0047]    As illustrated in  FIG. 2 , the storage compartment  110  of the refrigerator  1  is an accommodating space formed in the main body  100 , an intermediate partition  113  is provided in the accommodating space, and the accommodating space in the main body  100  is divided into a left part and a right part by the intermediate partition  113 . 
         [0048]    That is, the storage compartment  110  includes a freezer compartment  111  and a refrigerator compartment  112  which are divided into the left part and the right part by the intermediate partition  113 . 
         [0049]    Here, the freezer compartment  111  may be kept at a temperature of about minus 18.5° C. to maintain food in a frozen state, and the refrigerator compartment  112  may be maintained at a temperature of about 3° C. to keep food in a refrigerated state. 
         [0050]    Shelves and storage boxes for storing food are mounted inside the freezer compartment  111  and the refrigerator compartment  112 . 
         [0051]    The storage compartment  110  may further include an ice-making compartment  114  which makes ice, and the ice-making compartment  114  may be provided inside the freezer compartment  111 . 
         [0052]    Alternatively, the ice-making compartment  114  may be provided in the refrigerator compartment  112 . 
         [0053]    A compressor (not illustrated) which compresses refrigerant and discharges the refrigerant in a high-temperature and high-pressure state, a condenser (not illustrated) which condenses the refrigerant compressed in the compressor in the high-temperature and high-pressure state through heat dissipation, and a fan for condensing (not illustrated) which cools the condenser are disposed in the machine compartment  120 . 
         [0054]    A duct  121  in which air flows is formed in an internal space of the main body  100 , and an evaporator (not illustrated), which cools surrounding air by a cooling action in which surrounding latent heat is absorbed while evaporating the refrigerant provided from the condenser (not illustrated), and a fan for evaporation (not illustrated), which transfers air heat-exchanged in the evaporator, are disposed in the duct  121 . 
         [0055]    That is, the evaporator serves to lower a temperature of the storage compartment  110  ( 111  and  112 ). 
         [0056]    Such evaporators may be respectively positioned at a duct corresponding to the freezer compartment  111 , a duct corresponding to the refrigerator compartment  112 , and a duct corresponding to the ice-making compartment  114 . 
         [0057]    Alternatively, the evaporator may be positioned only at the duct corresponding to the freezer compartment  111 . 
         [0058]    The main body  100  includes a plurality of holes provided at walls of the storage compartment  110 . 
         [0059]    The plurality of holes are paths through which the air in the duct  121  and the storage compartment  110  is moved to another space. That is, the air is moved between the duct  121  and the storage compartment  110  through the plurality of holes. 
         [0060]    The refrigerator  1  further includes doors  130  ( 131  and  132 ) which are respectively provided at openings of front surfaces of the freezer compartment  111  and the refrigerator compartment  112  to open and close the freezer compartment  111  and the refrigerator compartment  112 , respectively. 
         [0061]    The doors  130  ( 131  and  132 ) shield the freezer compartment  111  and the refrigerator compartment  112  from the outside. A plurality of door shelves for storing food are mounted on an inner surface of each of the doors  130  ( 131  and  132 ). 
         [0062]    The refrigerator  1  further includes the dispenser  200  which supplies water or ice to a user without the doors being opened and supplies water and carbon dioxide for producing carbonated water. 
         [0063]    The dispenser  200  may be provided in the door  131  of the freezer compartment  111  or the door  132  of the refrigerator compartment  112 . 
         [0064]    Alternatively, unlike the embodiment of  FIGS. 1 and 2 , a refrigerator may have an accommodating space, which is divided into an upper part and a lower part by an intermediate partition, inside a main body thereof. 
         [0065]    Such a refrigerator includes a refrigerator compartment, which is an upper space of a storage compartment, and a freezer compartment, which is a lower space of the storage compartment, and further includes a door for the refrigerator compartment which opens and closes the refrigerator compartment and a door for the freezer compartment which opens and closes the freezer compartment. 
         [0066]    The door for the refrigerator compartment may be rotatable and may be provided in a side-by-side type, and the door for the freezer compartment may be forwardly slidable and may be provided in a drawer type. 
         [0067]    An ice-making compartment which generates ice may be provided in the refrigerator compartment, and a tank which stores water supplied from an external water supply source may be provided in the refrigerator compartment. The water stored in the tank may be water purified by a water purifying filter. 
         [0068]    Such a refrigerator may further include a dispenser which is provided in any one of a pair of doors for the refrigerator compartment, supplies the water in the tank or ice in the ice-making compartment to the user without the door being opened, and supplies water and carbon dioxide for producing carbonated water. 
         [0069]    That is, the dispenser may be provided in a refrigerator having French-type doors as well as the refrigerator having the side-by-side doors illustrated in  FIGS. 1 and 2 . 
         [0070]    As such, the dispenser  200  provided in the refrigerator may include a carbonated water producing apparatus  200   a  which supplies water and carbon dioxide for producing carbonated water, and may further include a water purifier which supplies purified water other than carbonated water and an ice supplier which receives ice and discharges the ice. 
         [0071]    Such a dispenser  200  will be described with reference to  FIGS. 3 to 6 . 
         [0072]      FIG. 3  is a front view of the dispenser provided in the refrigerator according to one embodiment,  FIG. 4  is a cross-sectional view of the dispenser illustrated in  FIG. 3 , and  FIG. 5  is a view of an exemplary container fastened to the dispenser illustrated in  FIG. 3 . 
         [0073]    The dispenser  200  includes a housing  210  disposed in an accommodating groove of the door  131  for the freezer compartment and a lever  220  which opens and closes an opening-and-closing member provided in a discharger  212  when ice or water is discharged, and further includes a user interface unit  230  which receives and outputs carbonated water production information and water and ice discharge information. 
         [0074]    More specifically, as illustrated in  FIGS. 3 and 4 , the housing  210  includes a recessed unit  211  which is inwardly recessed from a front surface thereof and forms a space for receiving an object, and the discharger  212  which is disposed above the recessed unit  211  and discharges the object. 
         [0075]    The discharger  212  includes a first discharge port  212   a  which discharges water and carbon dioxide for producing carbonated water, and a second discharge port  212   b  which discharges water or ice. 
         [0076]    A first water supply pipe, which supplies water for producing carbonated water, and a nozzle for injecting carbon dioxide may be disposed in the first discharge port  212   a , and a second water supply pipe for discharging purified water and an ice supply pipe  213   a  for discharging ice may be disposed in the second discharge port  212   b.    
         [0077]    That is, the dispenser  200  further includes the second water supply pipe for discharging purified water and the ice supply pipe  213   a  for discharging ice. 
         [0078]    The dispenser  200  further includes the carbonated water producing apparatus  200   a  having the first water supply pipe which supplies water and a nozzle for jetting carbon dioxide. 
         [0079]    As illustrated in  FIG. 5 , the carbonated water producing apparatus  200   a  may be provided inside the housing  210  of the dispenser  200 . 
         [0080]    The housing  210  of the dispenser  200  further includes an accommodation unit  214  which accommodates a carbon dioxide cylinder  251 , and a cover  215  which opens and closes the accommodation unit  214 . 
         [0081]    A container  2  which receives water and carbon dioxide for producing carbonated water is detachably fastened to the first discharge port  212   a  of the dispenser  200 . That is, the container  2  may be detachably fastened to the carbonated water producing apparatus  200   a  of the dispenser  200  through the first discharge port  212   a . As such, after the container  2  is fastened to the carbonated water producing apparatus  200   a , the container  2  receives water and carbon dioxide, the carbon dioxide dissolves in the water at this time, and thus carbonated water may be immediately produced. 
         [0082]    The carbonated water producing apparatus  200   a  which produces carbonated water using the container  2  detachably fastened thereto will be described with reference to  FIGS. 6 and 7 . 
         [0083]      FIG. 6  is a view of a fastening structure of the carbonated water producing apparatus and the container of the dispenser illustrated in  FIG. 5 , and  FIG. 7  is a schematic diagram of the carbonated water producing apparatus  200   a  according to one embodiment. 
         [0084]    As illustrated in  FIG. 6 , the carbonated water producing apparatus  200   a  includes a fastener  240  detachably fastened to the container  2 . Here, the fastener  240  may be disposed in the first discharge port  212   a  of the dispenser. 
         [0085]    The fastener  240  includes a body  241  having an insertion groove  240   a  into which an inlet  2   a  of the container  2  is inserted and a mounting groove  240   b  on which a protrusion  2   b  of the container  2  is mounted, a packing member  242 , which is disposed in the insertion groove  240   a  of the body  241 , comes into close contact with the inlet  2   a  of the container  2  when the container  2  is inserted in the insertion groove  240   a , and prevents water and carbon dioxide inside the container  2  from leaking to the outside, and a nozzle  243  which is disposed to be movable in the body  241  and jets the carbon dioxide. 
         [0086]    The packing member  242  includes a plurality of holes. The nozzle  243  is disposed to pass through any one of the plurality of holes of the packing member  242 . That is, the nozzle  243  reciprocates in the container  2 . 
         [0087]    A first water supply pipe  244  and a pressure adjusting pipe  245  may be disposed in the body  241  of the fastener  240 , and the first water supply pipe  244  and the pressure adjusting pipe  245  may also be disposed to pass through the holes of the packing member  242 . 
         [0088]    That is, since the first water supply pipe  244  and the pressure adjusting pipe  245  are disposed to pass through the holes of the packing member  242 , the first water supply pipe  244  and the pressure adjusting pipe  245  may be positioned inside the container  2  that is closed to the outside. 
         [0089]    Further, a water level detector  246  which detects a water level of the container  2  and a fastening detector  247  which detects whether the container  2  is fastened may be selectively disposed in the body  241  of the fastener  240 . 
         [0090]    Here, the water level detector  246  may be a moisture detector which detects overflow of water inside the container  2 , and may include an electrode. The fastening detector  247  may include a micro switch. 
         [0091]    A configuration of the carbonated water producing apparatus  200   a  will be described in detail with reference to  FIG. 7 , and a configuration of the water purifier connected to the carbonated water producing apparatus  200   a  will also be described with reference to  FIG. 7 . 
         [0092]    The carbonated water producing apparatus  200   a  includes a cylinder  251  which stores carbon dioxide and discharges the stored carbon dioxide when carbonated water is produced, an interrupter  252  which is disposed between an outlet of the cylinder  251  and the nozzle  243  and interrupts a flow of the carbon dioxide which moves from the cylinder  251  to the nozzle  243 , and a rotational angle detector  253  which detects an operational state of the interrupter  252 . 
         [0093]    Here, the interrupter  252  may include a motor, and the rotational angle detector  253  may include a hole sensor which detects a rotational angle of the motor. 
         [0094]    The carbonated water producing apparatus  200   a  includes a first adjuster  254  which is provided in the first water supply pipe  244  and adjusts an amount of purified water supplied from an external tank to the container  2 , and a second adjuster  255  which is provided in the pressure adjusting pipe  245  and adjusts pressure in the container  2 . 
         [0095]    Here, the first adjuster  254  may include a first valve, and the second adjuster  255  may include a second valve. The first valve may be a double check (DC) valve, and the second valve may be a vent valve. 
         [0096]    The water purifier may be connected to an external water supply source such as a spigot, and may include a tank  262  which stores purified water purified through a water purifying filter  261 , a third adjuster  263  which is connected to the tank  262  and supplies the purified water stored in the tank  262  or blocks the supply of the purified water, a flow rate detector  264  which detects an amount of the purified water supplied from the third adjuster  263 , and a fourth adjuster  265  which adjusts an amount of the purified water supplied to the second water supply pipe  213   b  through the third adjuster  263 . 
         [0097]    The water purifier may further include a fifth adjuster  266  which supplies the purified water in the tank  262  to an ice-making apparatus  267  of the ice-making compartment. 
         [0098]    Here, each of the third adjuster  263  and the fifth adjuster  266  includes a solenoid valve, and the fourth adjuster  265  includes a DC valve. Further, the water of the water supply source may be directly supplied to the second water supply pipe  213   b  and the ice-making apparatus  267  without purifying the water of the water supply source. In this case, the third adjuster  263  and the fifth adjuster  266  block a strong pressure of the water supply source and adjust the supply of the water to the second water supply pipe  213   b  and the ice-making apparatus  267 . 
         [0099]    The ice-making apparatus  267  is positioned at the ice-making compartment  114  and includes an ice-maker, which receives purified water to generate ice, and a storage unit, which stores the generated ice therein. The storage unit is connected to the ice supply pipe  213   a  of the ice supplier of the dispenser and discharges the stored ice to the ice supply pipe  213   a  of the ice supplier in response to an ice discharge command. 
         [0100]      FIG. 8  is a control block diagram of the refrigerator according to one embodiment. 
         [0101]    The refrigerator includes a user interface unit  230 , a plurality of detectors, a sound obtainer  248 , a controller  270 , and a storage  271  which are components for controlling the dispenser. 
         [0102]    The user interface unit  230  includes an input unit  231  which receives an operation command of the refrigerator, and an output unit  232  which displays operation information of the refrigerator. 
         [0103]    Such a user interface unit  230  will be described with reference to  FIGS. 9, 10A, and 10B . 
         [0104]    As illustrated in  FIG. 9 , the input unit  231  and the output unit  232  of the user interface unit  230  may be integrally implemented. 
         [0105]    The input unit  231  may be implemented as a plurality of buttons or a touch panel. 
         [0106]    As illustrated in  FIGS. 10A and 10B , the output unit  232  may include a display film  230   a  on which text is printed, an inlay film  230   b  on which text and an icon b 1  are carved, and a lamp  230   c  which provides light to the text and the icon b 1  of the inlay film  230   b.    
         [0107]    That is, the user interface unit  230  outputs light from the lamp  230   c  to the outside through the text and the icon b 1  of the inlay film  230   b  to notify the user of operation information of the refrigerator. 
         [0108]    Further, when the input unit  231  is formed to have a plurality of buttons (not illustrated), the plurality of buttons may be disposed at positions corresponding to the text and the icon b 1  of the inlay film  230   b.    
         [0109]    The user interface unit  230  includes a first input-and-output unit  233 , which receives an operation command corresponding to carbonated water production and displays operation information corresponding to the carbonated water production, and a second input-and-output unit  234 , which receives a purified water or ice discharge command and displays purified water or ice discharge information. 
         [0110]    More specifically the first input-and-output unit  233  includes a first carbonated water information area  233   a , which receives a carbonated water producing command and a stop command from the user and displays whether carbonated water is produced, a second carbonated water information area  233   b , which receives a concentration of carbonated water from the user and displays the received concentration of the carbonated water, and a third carbonated water information area  233   c , which receives a carbonic acid addition command from the user and displays whether carbonic acid is added. 
         [0111]    The second carbonated water information area  233   b  may include a seven-segment display which displays the concentration of the carbonated water as a number. 
         [0112]    The second input-and-output unit  234  includes a first discharge information area  234   a , which receives a purified water discharge command and displays purified water discharge information, and a second discharge information area  234   b , which receives the ice discharge command and displays ice discharge information. 
         [0113]    Further, the user interface unit  230  further includes a third input-and-output unit  235 , which receives target temperatures of the freezer compartment and the refrigerator compartment and displays the received target temperatures of the freezer compartment and the refrigerator compartment. 
         [0114]    The third input-and-output unit  235  may include a plurality of seven-segment displays which display the target temperatures of the freezer compartment and the refrigerator compartment. 
         [0115]    The user interface unit  230  includes an alarm output unit  236  which outputs alarm information. 
         [0116]    The alarm output unit  236  includes a water overflow alarm display  236   a  which notifies the user of water overflow of the container  2  when carbonated water is produced. Further, the alarm output unit  236  may include a cylinder replacement display  236   b  which notifies the user of cylinder replacement. 
         [0117]    Further, the user interface unit  230  may receive a function such as special freezing, in which a target temperature is set to about minus 30° C., removing of microorganisms/deodorizing, or the like, and display operation information of the received function. 
         [0118]    Further, the input unit  231  may be implemented as a touch panel, and the output unit  232  may be implemented as a flat display panel such as a liquid crystal display (LCD), a plasma display panel (PDP), an organic light-emitting diode (OLED), or the like. 
         [0119]    That is, the user interface unit  230  may be implemented as a touch screen in which a touch panel and a flat display panel are integrally formed. 
         [0120]    The plurality of detectors include a lever manipulation detector  221  which detects whether the lever  220 , which instructs that purified water be discharged or that water be discharged, is pressed, the water level detector  246  which detects a level of water supplied into the container  2 , the fastening detector  247  which detects whether the container  2  is fastened to the fastener  240  of the carbonated water producing apparatus, the rotational angle detector  253  which detects operation information of the interrupter  252  which interrupts the discharge of the carbon dioxide of the cylinder  251 , and the flow rate detector  264  which detects an amount of purified water supplied from the tank. 
         [0121]    The sound obtainer  248  obtains a sound generated when the carbon dioxide is supplied from the cylinder through the nozzle  243 . A detailed description thereof will be described below. 
         [0122]    Here, each of the detectors  221 ,  246 ,  247 ,  253 , and  264  and the sound obtainer  248  transmit detected signals to the controller  270 . 
         [0123]    The controller  270  controls operations of the dispenser  200  based on the signals detected by the plurality of detectors, a sound signal obtained by the sound obtainer  248 , and a signal of the input unit  231  of the user interface unit  230 . 
         [0124]    Here, the control of the operations of the dispenser  200  includes controlling opening and closing the first adjuster  254 , the second adjuster  255 , the third adjuster  263 , the fourth adjuster  265 , and the fifth adjuster  266 , and controlling rotation of the interrupter  252 . 
         [0125]    More specifically, the controller  270  determines a current amount of purified water stored in the tank  262 . When the determined current amount of purified water is a predetermined amount or less, the controller  270  controls water supply of the water supply source, controls filtering the water of the water supply source, and controls the filtered purified water to be stored in the tank  262 . 
         [0126]    The controller  270  may control as much water as is insufficient in the tank  262  to be supplied from the water supply source and to be filtered. 
         [0127]    Here, the amount of purified water that is insufficient may be determined from a difference between a maximum amount of purified water which is storable in the tank  262  and a current amount of purified water. 
         [0128]    Further, the current amount of purified water may be determined based on a signal detected by the water level detector (not illustrated) provided in the tank  262 . 
         [0129]    The controller  270  determines whether the container  2  is fastened to the fastener  240  by checking a detection signal of the fastening detector  247 . When it is determined that the container  2  is fastened to the fastener  240 , the controller  270  controls the first input-and-output unit  233  to be activated. 
         [0130]    The controller  270  controls the lamp  230   c  provided in the first input-and-output unit  233  to be turned on when the first input-and-output unit  233  is controlled to be activated. 
         [0131]    The controller  270  determines whether the first carbonated water information area  233   a  is selected while the first input-and-output unit  233  is activated. When it is determined that the first carbonated water information area  233   a  is selected, the controller  270  controls the first adjuster  254  and the third adjuster  263  to be opened so that the purified water stored in the tank  262  is supplied into the container  2 . 
         [0132]    The determination of whether the first carbonated water information area  233   a  is selected includes determining whether a signal corresponding to the carbonated water producing command is input to the first input-and-output unit  233 . 
         [0133]    The controller  270  determines an amount of the purified water supplied into the container  2  based on a detection signal of the flow rate detector  264  when supplying the purified water, and compares the determined amount of the purified water with a first reference amount. When the determined amount of the purified water is the first reference amount, the controller  270  controls the first adjuster  254  and the third adjuster  263  to be closed so that the supply of the purified water is blocked. 
         [0134]    The controller  270  may control the purified water to be supplied for a predetermined time when supplying the purified water. When the supply of the purified water is completed, the controller  270  may control the first adjuster  254  and the third adjuster  263  to be closed. 
         [0135]    Further, the controller  270  controls the second adjuster  255  to be open before the purified water is supplied in order to prevent the pressure of the container  2  from increasing according to the supply of the purified water. 
         [0136]    Thus, a path of the pressure adjusting pipe  245  inserted into the container  2  is open. 
         [0137]    That is, in a case in which the carbonated water producing command is input, the controller  270  controls the first adjuster  254  and the third adjuster  263  to be opened when a first time has elapsed from a time point at which the second adjuster  255  is open. 
         [0138]    The controller  270  determines whether the water level of the purified water inside the container  2  is a predetermined water level or more when the supply of the purified water is completed. When it is determined that the water level of the purified water inside the container  2  is the predetermined water level or more, the controller  270  controls the carbonated water production to be stopped. 
         [0139]    The determination of whether the water level of the purified water inside the container  2  is the predetermined water level or more includes determining, by the flow rate detector, whether the water level of the purified water inside the container  2  is the predetermined water level or more by an amount of water previously stored in the container  2  before supplying the purified water even though less than the predetermined water level of purified water is supplied in the container. 
         [0140]    In this case, the controller  270  controls the first input-and-output unit  233  to be deactivated, and controls the water overflow icon to be illuminated by controlling the operation of the lamp  230   c  disposed on the water overflow alarm display  236   a  of the alarm output unit  236 . 
         [0141]    Thus, the user may recognize a water overflow state of the container  2 . 
         [0142]    As such, the purified water of the container  2  may be maintained at the predetermined amount based on the detection signal of the flow rate detector  264  and the detection signal of the water level detector  246 . 
         [0143]    When it is determined that the water level of the purified water inside the container  2  is less than the predetermined water level in a state in which the supply of the purified water is completed, the controller  270  controls the operation of the interrupter  252  so that the carbon dioxide in the cylinder  251  is discharged, and controls a rotational angle of the interrupter  252  based on a detection signal of the rotational angle detector  253 . Here, the interrupter  252  may include a motor, and the rotational angle detector  253  may include a hole sensor which detects a rotational angle of the motor. 
         [0144]    Thus, the cylinder  251  may discharge a predetermined amount of carbon dioxide at a predetermined pressure. 
         [0145]    Further, the controller  270  controls the operation of the interrupter  252  when a second time has elapsed from a time point at which the water supply is completed. 
         [0146]    When a third time has elapsed from a time point at which the discharge of the carbon dioxide is completed, the controller  270  controls the second adjuster  255  to be opened in order to reduce the pressure in the container  2 . 
         [0147]    When the carbonated water production is completed, the controller  270  may control carbonated water production completion information to be displayed. 
         [0148]    The controller  270  determines whether the first carbonated water information area  233   a  is reselected during the carbonated water production. When it is determined that the first carbonated water information area  233   a  is reselected, the controller  270  controls the carbonated water production to be stopped. 
         [0149]    Here, the determination of whether the first carbonated water information area  233   a  is reselected includes determining whether a signal corresponding to a carbonated water production stop command is input. 
         [0150]    The controller  270  determines a concentration of the carbonated water, which is set before the carbonated water production, and controls carbon dioxide to be jetted at the number of times corresponding to the determined concentration thereof. 
         [0151]    The controller  270  controls the nozzle to be moved downward so that the nozzle is immersed in the water in the container  2  before the carbon dioxide is jetted. When the jet of the carbon dioxide is completed, the controller  270  controls the nozzle to be moved upward. 
         [0152]    Further, the controller  270  controls the pressure in the container  2  to be reduced by controlling the second adjuster to be opened each time the carbon dioxide is jetted. 
         [0153]    The controller  270  determines whether the third carbonated water information area  233   c  is selected when the carbonated water production is completed. When it is determined that the third carbonated water information area  233   c  is selected, the controller  270  controls the carbon dioxide to be additionally jetted into the container  2  by controlling the operation of the interrupter  252 . 
         [0154]    Here, the determination of whether the third carbonated water information area  233   c  is selected includes determining whether a signal corresponding to a carbonic acid addition jet command is input. 
         [0155]    The controller  270  controls the water level detector which detects the water level of the container  2  to be deactivated when the carbon dioxide is jetted. 
         [0156]    Thus, the water level of the container may be detected to be the determined water level or more due to sloshing of the water inside the container  2  by the jet of the carbon dioxide, and thus the carbonated water production may be prevented from stopping. 
         [0157]    The controller  270  determines whether the third carbonated water information area  233   c  is reselected within a predetermined time. When it is determined that the third carbonated water information area  233   c  is reselected, the controller  270  may determine that the carbonic acid addition jet command is canceled, and control the jet of the carbon dioxide to be stopped. 
         [0158]    The controller  270  determines whether the container  2  is separated from the fastener  240  based on the detection signal of the fastening detector  247 . When it is determined that the container  2  is separated from the fastener  240 , the controller  270  controls the first input-and-output unit  233  to be deactivated. 
         [0159]    In this case, the controller  270  controls the lamp  230   c  provided in the first input-and-output unit  233  to be turned off. 
         [0160]    As such, carbonated water having a concentration desired by the user may be provided by producing carbonated water having the concentration of carbonated water set by the user or by producing carbonated water having an additionally increased concentration of carbonated water by the user. Further, since carbonated water is provided by being directly produced at a time point desired by the user, the quality of the carbonated water may be maintained whenever the carbonated water is produced. 
         [0161]    The controller  270  determines whether the first discharge information area  234   a  of the second input-and-output unit  234  is selected in a state in which the container  2  is not fastened to the fastener  240 . When it is determined that the first discharge information area  234   a  is selected, the controller  270  controls the lamp  230   c  of the first discharge information area  234   a  to be turned on. 
         [0162]    Here, the determination of whether the first discharge information area is selected includes determining whether a signal corresponding to the purified water discharge command is input. 
         [0163]    The controller  270  determines whether a manipulation signal is received from the lever manipulation detector  221  in a state in which the first discharge information area  234   a  is selected. When it is determined that a manipulation signal of the lever  220  is received, the controller  270  controls the third adjuster  263  and the fourth adjuster  265  to be opened. 
         [0164]    The controller  270  determines an amount of purified water supplied based on the detection signal of the flow rate detector  264  during the purified water discharge, and compares the determined amount of the purified water with a second reference amount. When the determined amount of the purified water is the second reference amount, the controller  270  controls the third adjuster  263  and the fourth adjuster  265  to be closed so that the discharge of the purified water is stopped. 
         [0165]    Further, the controller  270  may discharge purified water for a predetermined time by controlling the third adjuster  263  and the fourth adjuster  265  to be opened. 
         [0166]    When the discharge of purified water is completed, the controller  270  controls the lamp  230   c  of the first discharge information area  234   a  to be turned off. 
         [0167]    The controller  270  determines whether the second discharge information area  234   b  of the second input-and-output unit  234  is selected in the state in which the container  2  is not fastened to the fastener  240 . When it is determined that the second discharge information area  234   b  is selected, the controller  270  controls the lamp  230   c  of the second discharge information area  234   b  to be turned on. 
         [0168]    Here, the determination of whether the second discharge information area  234   b  is selected includes determining whether a signal corresponding to the ice discharge command is input. 
         [0169]    The controller  270  determines whether the manipulation signal is received from the lever manipulation detector  221  in a state in which the second discharge information area  234   b  is selected. When it is determined that the manipulation signal of the lever  220  is received, the controller  270  discharges ice to the second discharge port  212   b  through the ice supply pipe  213   a  by controlling the opening-and-closing member (not illustrated) disposed on the ice supply pipe to be opened for a determined time. 
         [0170]    When the discharge of ice is completed, the controller  270  controls the lamp  230   c  of the second discharge information area  234   b  to be turned off. 
         [0171]    When it is determined that an amount of ice of the storage unit of the ice-making device is a predetermined amount or less, the controller  270  controls the purified water stored in the tank  262  to be supplied to the ice-maker of the ice-making device by controlling the fifth adjuster  266  to be opened. 
         [0172]    The storage  271  stores the first reference amount of purified water for producing carbonated water, the second reference amount for discharging the purified water, the predetermined water level for determining the water overflow of the container, a first time from a time point at which the carbonated water producing command is received to a time point before the supply of the water is started, the second time from a time point at which the supply of the water is completed to a time point before the jet of the carbon dioxide is started, and the third time from a time point at which the jet of the carbon dioxide is completed to a time point before the pressure of the container is adjusted. 
         [0173]    Here, the first time is a time that the second valve, which is the second adjuster  255 , is opened in advance in order to prevent the pressure in the container  2  from increasing before the water is supplied thereto, and the third time is a time from a time point at which the jet of the carbon dioxide is completed to a time point before the second valve which is the second adjuster  255  is opened in order to reduce the pressure in the container  2 . 
         [0174]    The storage  271  stores jet information of carbon dioxide corresponding to the concentration of carbon dioxide and jet information of carbon dioxide corresponding to the carbonic acid addition command. Here, the jet information includes a jet condition for carbon dioxide jetting. 
         [0175]    That is, the storage  271  stores the number of times to jet carbon dioxide corresponding to the concentration of carbonated water, and the number of times to jet carbon dioxide corresponding to the carbon dioxide addition command. 
         [0176]    Here, the controller  270  may be a processor, a central processing unit (CPU), a micro controller unit (MCU), and the like, and the storage  271  may be a memory such as a random access memory (RAM) which may read and write data, a read only memory (ROM) which may read data, and the like. 
         [0177]    Meanwhile, the refrigerator according to the disclosed embodiment includes the sound obtainer  248  provided to obtain a sound generated when carbon dioxide is supplied from the cylinder  251  to the container  2  through the nozzle  243  as described above. Since a sound generated in the cylinder  251  when carbon dioxide is jetted in a case in which there is sufficient carbon dioxide in the cylinder  251  is different from a sound generated when the carbon dioxide is jetted in the cylinder  251  in a case in which there is insufficient carbon dioxide in the cylinder  251 , the refrigerator according to the disclosed embodiment determines a replacement time of the cylinder  251  using a difference between the sounds. When it is determined that it is the replacement time of the cylinder  251 , the controller  270  notifies the user of the replacement time of the cylinder  251  by turning on the lamp  230   c  provided in the cylinder replacement display  236   b  of the user interface unit  230 . Hereinafter, a method of determining the replacement time of the cylinder  251  using the sound obtainer  248  and notifying the user of the replacement time of the cylinder  251  through the user interface unit  230  will be described in detail. 
         [0178]      FIG. 11  is a block diagram illustrating a configuration of the sound obtainer  248  of the refrigerator  1  according to one embodiment, and  FIG. 12  is a flowchart illustrating a method of controlling the refrigerator  1  according to one embodiment. 
         [0179]    As illustrated in  FIG. 11 , the sound obtainer  248  according to one embodiment includes a single microphone M provided to obtain a sound generated in the cylinder  251 , and a high pass filter F which filters a sound signal obtained by the microphone M. 
         [0180]    The controller  270  turns on the microphone M at a time point at which carbon dioxide is supplied so that the microphone M obtains a sound generated when carbon dioxide of the cylinder  251  is supplied through the nozzle  243 . The microphone M obtains peripheral noise as well as the sound generated by the supply of the carbon dioxide. The microphone M may obtain a variety of noises such as noises generated from home appliances such as a vacuum cleaner, a washing machine, a hair dryer, and the like, an external noise such as a car sound, and noise generated from a kitchen when washing dishes and cooking. Therefore, the refrigerator according to the disclosed embodiment excludes the peripheral noise as much as possible, does not operate the microphone M at normal times so that the sound generated when the carbon dioxide is supplied from the cylinder  251  is mainly obtained, and temporally filters the peripheral noise by turning the microphone M on at the time point at which the carbon dioxide is supplied from the cylinder  251 . 
         [0181]    For example, the controller  270  may turn the microphone M on in conjunction with a carbonated water production command when the carbonated water production command is input through the user interface unit  230 . Alternatively, the controller  270  may turn on the microphone M at a time point at which the interrupter  252  operates so that the microphone M operates at a time closer to a time at which the carbon dioxide is jetted. Since the interrupter  252  interrupts flow of the carbon dioxide which moves from the cylinder  251  to the nozzle  243 , the operating of the microphone M in conjunction with an operation time point of the interrupter  252  may be further matched to the purpose of temporally filtering peripheral noise. 
         [0182]    The controller  270  turns the microphone M on in conjunction with the operation time point of the interrupter  252  as described above and turns the microphone M off when a time of about 1 second has elapsed. The above-described 1 second is only an example, and a time during which the microphone M operates may be preset and stored as a time appropriate to temporally filter the peripheral noise. 
         [0183]    Even when the microphone M is driven in conjunction with the operation time point of the interrupter  252 , noise generated at such a time point may be obtained by the microphone M. The sound obtainer  248  according to the disclosed embodiment includes the filter F in order to remove noise indicative of the peripheral noise from the sound signal obtained by the microphone M and to separate the sound generated when the carbon dioxide is jetted through the nozzle  243 . The filter F may include a 34th finite impulse response (FIR) filter having about 2 kHz of cutoff frequency. Alternatively, the filter F may include a band pass filter through which a frequency of a band ranging from about 2 kHz to 4 kHz passes. Since noise, which is emphasized in a band of about 2 kHz or more or in the band ranging from about 2 kHz to 4 kHz in everyday life, is uncommon while the sound generated when the carbon dioxide is jetted through the nozzle  243  is emphasized in the band ranging from about 2 kHz to 4 kHz, the above-described filter F is used. 
         [0184]    The controller  270  calculates a root mean square (RMS) value of the signal passing through the filter F, and determines whether there is insufficient carbon dioxide based on the calculated RMS value. The following Table 1 shows RMS values corresponding to types of sound. 
         [0000]    
       
         
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
             
             
               
                   
                   
               
               
                   
                 Type of sound 
               
             
          
           
               
                   
                   
                 CO 2   
                 Washing 
                 Vacuum 
                   
                   
               
               
                   
                 CO 2   
                 insuf- 
                 machine 
                 cleaner 
                 Wind 
                 Car 
               
               
                   
                 normal 
                 ficient 
                 operation 
                 operation 
                 Sound 
                 sound 
               
               
                   
                   
               
             
          
           
               
                 RMS [dB] 
                 38.6 
                 11.7 
                 12.6 
                 23.5 
                 12.8 
                 20.4 
               
               
                   
               
             
          
         
       
     
         [0185]    Since an RMS value calculated when an amount of CO 2  is normal is greater than RMS values calculated when an amount of CO 2  is insufficient and peripheral noise is about 12 dB or more, it may be determined that there is insufficient carbon dioxide by detecting the sound generated when the carbon dioxide is jetted from the cylinder  251  through the nozzle  243 . That is, the controller  270  may compare an RMS value of a signal passing through the filter F with a predetermined reference value c. When the calculated RMS value is less than the reference value, the controller  270  may determine that there is insufficient carbon dioxide in the cylinder  251 . The reference value c may be pre-stored by setting an RMS value when the amount of CO 2  is normal as a predetermined margin and considering an RMS value when the amount of CO 2  is insufficient based on the RMS value when the amount of CO 2  is normal. When it is determined that there is insufficient carbon dioxide by comparing the RMS value with the reference value, the controller  270  turns the lamp  230   c  provided in the cylinder replacement display  236   b  of the user interface unit on to notify the user of the replacement time of the cylinder  251 . 
         [0186]    As such, the refrigerator according to the disclosed embodiment temporally filters peripheral noise through the control of a turn-on time point of the microphone M as described above, filters noise again through the filter F, and thus the sound generated when the carbon dioxide is jetted from the cylinder  251  through the nozzle  243  may be accurately obtained. 
         [0187]    A method of notifying the user of the replacement time of the cylinder  251  will be described in more detail with reference to  FIG. 12 . 
         [0188]    As illustrated in  FIG. 12 , when the interrupter  252  operates (S 500 ), the rotational angle detector  253  detects a rotational angle of the interrupter  252  (S 510 ), and when the rotational angle detector  253  detects an operation of the interrupter  252 , carbonated water is produced (S 520 ). Since a process of producing carbonated water has already been described, a description thereof will be omitted. 
         [0189]    When the interrupter  252  operates, the controller  270  operates the microphone M (S 530 ), and the high pass filter F filters sound obtained by the microphone M when the sound is detected by the microphone M (S 540 ). The controller  270  calculates an RMS value of a signal passing through the filter F and compares the RMS value with a predetermined reference value (S 550 ), and displays a replacement message of the cylinder  251  on a user interface unit when the RMS value is less than the reference value and the operation of the interrupter  252  is detected by the rotational angle detector  253  (S 560 ). 
         [0190]    The controller  270  turns on the microphone M at a time point at which carbon dioxide is supplied so that a sound generated when carbon dioxide of the cylinder  251  is supplied through the nozzle  243  is obtained by the microphone M. The microphone M obtains peripheral noise as well as the sound generated by the supply of the carbon dioxide. Therefore, the refrigerator according to the disclosed embodiment excludes the peripheral noise as much as possible, does not operate the microphone M at normal times so that the sound generated when the carbon dioxide is supplied from the cylinder  251  is mainly obtained, and temporally filters the peripheral noise by turning the microphone M on at the time point at which carbon dioxide is supplied from the cylinder  251 . 
         [0191]    For example, the controller  270  may turn the microphone M on at a time point at which the interrupter  252  operates so that the microphone M operates at a time closer to a time at which carbon dioxide is jetted. Since the interrupter  252  interrupts a flow of carbon dioxide which moves from the cylinder  251  to the nozzle  243 , the microphone M being operated in conjunction with an operation time point of the interrupter  252  may be further matched to a purpose of temporally filtering the peripheral noise. 
         [0192]    The controller  270  turns the microphone M on in conjunction with the operation time point of the interrupter  252  as described above and turns the microphone M off when a time of about 1 second has elapsed. The above-described 1 second is only an example, and the time during which the microphone M operates may be preset and stored as a time appropriate to temporally filter the peripheral noise. 
         [0193]    Even when the microphone M is driven in conjunction with the operation time point of the interrupter  252 , noise generated at such a time point may be obtained by the microphone M. The sound obtainer  248  according to the disclosed embodiment includes the filter F in order to remove noise indicative of the peripheral noise from a sound signal obtained by the microphone M and to separate the sound generated when carbon dioxide is jetted through the nozzle  243 . The filter F may include a 34 th  FIR filter having about 2 kHz of cutoff frequency. Alternatively, the filter F may include a band pass filter through which a frequency of a band ranging from about 2 kHz to 4 kHz passes. Since noise, which is emphasized in a band of about 2 kHz or more or in the band ranging from about 2 kHz to 4 kHz in everyday life, is uncommon while the sound generated when the carbon dioxide is jetted through the nozzle  243  is emphasized in the band ranging from about 2 kHz to 4 kHz, the above-described filter F is used. 
         [0194]    The controller  270  calculates an RMS value of the signal passing through the filter F, and determines whether there is insufficient carbon dioxide based on the calculated RMS value. That is, the controller  270  may compare the RMS value of the signal passing through the filter F with the predetermined reference value c, and may determine that there is insufficient carbon dioxide in the cylinder  251  when the calculated RMS value is less than the reference value. When it is determined that there is insufficient carbon dioxide by comparing the RMS value with the reference value, the controller  270  turns the lamp  230   c  provided in the cylinder replacement display  236   b  of the user interface unit on to notify the user of the replacement time of the cylinder  251 . 
         [0195]      FIG. 13  is a block diagram illustrating a configuration of a sound obtainer  248  of a refrigerator according to another embodiment, and  FIG. 14  is a view conceptually illustrating beamforming of a sound signal obtained by the sound obtainer  248  of the refrigerator according to another embodiment.  FIG. 15  is a flowchart illustrating a method of controlling the refrigerator according to another embodiment. 
         [0196]    As illustrated in  FIG. 13 , the sound obtainer  248  according to another embodiment includes a first microphone M 1  and a second microphone M 2  which are provided to obtain sound generated in a cylinder  251 , a beamformer B which performs beamforming on the sound obtained by the first microphone M 1  and the second microphone M 2 , and a high pass filter F which filters a signal beamformed by the beamformer B. 
         [0197]    A controller  270  turns the microphones M 1  and M 2  on at a time point at which carbon dioxide is supplied so that a sound generated when carbon dioxide of the cylinder  251  is supplied through a nozzle  243  is obtained by the microphones M 1  and M 2 . The microphones M 1  and M 2  obtain peripheral noise as well as the sound generated by the supply of the carbon dioxide. Therefore, the refrigerator according to the disclosed embodiment excludes the peripheral noise as much as possible, does not operate the microphone M 1  and M 2  at normal times so that the sound generated when the carbon dioxide is supplied from the cylinder  251  is mainly obtained, and temporally filters the peripheral noise by turning the microphone M 1  and M 2  on at the time point at which carbon dioxide is supplied from the cylinder  251 . Since a description thereof is the same as the above-described description, the description thereof will be omitted. 
         [0198]    The sound obtainer  248  according to the present embodiment may include the first microphone M 1  and the second microphone M 2 , that is, two microphones, and may amplify the sound generated when carbon dioxide is jetted from the cylinder  251  through the nozzle  243 . As illustrated in  FIG. 14 , a sound which is generated while the nozzle  243  operates is obtained by each of the first microphone M 1  and the second microphone M 2  which are spaced a predetermined distance apart. In this case, a difference between a time at which a sound generated in the nozzle  243  reaches the first microphone M 1  and a time at which the sound generated in the nozzle  243  reaches the second microphone M 2  occurs, and the difference is indicative of a phase difference between signals obtained by the first microphone M 1  and the second microphone M 2  as illustrated in  FIG. 14 . 
         [0199]    A phase difference T 1  which occurs in this case may be represented as a function of an arrangement distance d between the first microphone M 1  and the second microphone M 2  and a forward angle θ of the sound. The following Equation 1 shows the above-described phase difference τ 1 . 
         [0000]      τ1 =d ·cos θ· f   s   /c   &lt;Equation 1&gt;
 
         [0200]    In Equation 1, f s  represents a sampling rate of the beamformer B, and c represents the speed of sound. 
         [0201]    The beamformer B performs beamforming in which a phase difference between a sound signal obtained by the first microphone M 1  and a sound signal obtained by the second microphone M 2  is calculated by applying the arrangement distance between the first microphone M 1  and the second microphone M 2  and the forward angle of the sound to Equation 1, the calculated phase difference illustrated in  FIG. 14  is used to delay the sound signal obtained by the second microphone M 2  by the calculated phase difference, and then the delayed sound signal is summed with the sound signal obtained by the first microphone M 1 . 
         [0202]    The beamformer B may amplify the sound generated in the nozzle  243  by removing the phase difference between the signals obtained by the two microphones and summing. Since such beamforming may minimize noise generated in spaces other than a space in which the sound is generated, the beamforming may provide an effect of spatial filtering peripheral noise. Since a sound signal which will be finally filtered in the disclosed embodiment is a signal having a high frequency ranging from about 2 kHz to 4 kHz, a distance between the two microphones for optimal beamforming may be set to range from about 50 mm to 85 mm. 
         [0203]    Meanwhile, the sound obtainer  248  includes the filter F in order to remove noise indicative of the peripheral noise from the signal beamformed by the beamformer B and to separate the sound generated when carbon dioxide is jetted through the nozzle  243 . The filter F may include a 34 th  FIR filter having about 2 kHz of cutoff frequency. Alternatively, the filter F may include a band pass filter which passes a frequency of a band ranging from about 2 kHz to 4 kHz. Since noise, which is emphasized in a band of about 2 kHz or more or in the band ranging from about 2 kHz to 4 kHz in everyday life, is not uncommon while the sound generated when the carbon dioxide is jetted through the nozzle  243  is emphasized in a band ranging from about 2 kHz to 4 kHz, the above-described filter F is used. 
         [0204]    The controller  270  calculates an RMS value of the signal passing through the filter F, and determines whether there is insufficient carbon dioxide based on the calculated RMS value. Since a description thereof is the same as the above-described description, the description thereof will be omitted. 
         [0205]    When it is determined that there is insufficient carbon dioxide by comparing the RMS value with the reference value, the controller  270  turns the lamp  230   c  provided in the cylinder replacement display  236   b  of the user interface unit on to notify the user of the replacement time of the cylinder  251 . 
         [0206]    As such, the refrigerator according to the present embodiment temporally filters the peripheral noise through a control of turn-on time points of the microphones as described above, spatially filters the peripheral noise by beamforming the signals obtained by the two microphones, filters the noise again through the filter F, and thus the sound generated when the carbon dioxide is jetted from the cylinder  251  through the nozzle  243  may be accurately obtained. 
         [0207]    A method of notifying the user of the replacement time of the cylinder  251  according to the present embodiment will be described with reference to  FIG. 15 . 
         [0208]    As illustrated in  FIG. 15 , when the interrupter  252  operates (S 600 ), the rotational angle detector  253  detects a rotational angle of the interrupter  252  (S 610 ), and carbonated water is produced when an operation of the interrupter  252  is detected by the rotational angle detector  253  (S 620 ). Since the process of producing carbonated water has already been described, a description thereof will be omitted. 
         [0209]    When the interrupter  252  operates, the controller  270  operates the first microphone M 1  and the second microphone M 2  (S 630 ), and the beamformer B performs beamforming when a sound is detected by the first microphone M 1  and the second microphone M 2  (S 640 ). The high pass filter F filters a beamformed signal (S 650 ), and the controller  270  calculates an RMS value of the signal passing through the filter F and compares the calculated RMS value with a predetermined reference value (S 660 ). When it is determined that the RMS value is less than the reference value and the operation of the interrupter  252  is detected by the rotational angle detector  253 , the controller  270  displays a replacement message of the cylinder  251  on a user interface unit (S 670 ). 
         [0210]    The controller  270  turns on the microphone at a time point at which carbon dioxide is supplied so that the sound generated when the carbon dioxide of the cylinder  251  is supplied through the nozzle  243  is obtained by the microphones. The microphones obtain peripheral noise as well as the sound generated by the supply of the carbon dioxide. Therefore, the refrigerator according to the disclosed embodiment excludes the peripheral noise as much as possible, does not operate the microphones at normal times so that the sound generated when the carbon dioxide is supplied from the cylinder  251  is mainly obtained, and temporally filters the peripheral noise by turning the microphones on at the time point at which carbon dioxide is supplied from the cylinder  251 . Since a description thereof is the same as the above-described description, the description thereof will be omitted. 
         [0211]    The sound obtainer  248  according to the present embodiment may include the first microphone M 1  and the second microphone M 2 , that is, two microphones, and may amplify the sound generated when carbon dioxide is jetted from the cylinder  251  through the nozzle  243 . As illustrated in  FIG. 14 , a sound which is generated while the nozzle  243  operates is obtained by the first microphone M 1  and the second microphone M 2  which are spaced a predetermined distance apart. In this case, a difference between a time at which the sound generated in the nozzle  243  reaches the first microphone M 1  and a time at which the sound generated in the nozzle  243  reaches the second microphone M 2  occurs, and the difference is indicative of a phase difference between signals obtained by the first microphone M 1  and the second microphone M 2  as illustrated in  FIG. 14 . 
         [0212]    The phase difference T 1  which occurs in this case may be represented as a function of the arrangement distance d between the first microphone M 1  and the second microphone M 2  and the forward angle θ of the sound. The above-described Equation 1 shows the above-described phase difference τ 1 . 
         [0213]    The beamformer B performs beamforming in which a phase difference between a sound signal obtained by the first microphone M 1  and a sound signal obtained by the second microphone M 2  is calculated by applying the arrangement distance between the first microphone M 1  and the second microphone M 2  and the forward angle of the sound to Equation 1, the calculated phase difference illustrated in  FIG. 14  is used to delay the sound signal obtained by the second microphone M 2  by the calculated phase difference, and then the delayed sound signal is summed with the sound signal obtained by the first microphone M 1 . 
         [0214]    The beamformer B may amplify the sound generated in the nozzle  243  by removing phase difference and summing the signals obtained by the two microphones. Since such beamforming may minimize noise generated in spaces other than a space in which the sound is generated, the beamforming may provide an effect of spatial filtering the peripheral noise. Since a sound signal which will be finally filtered in the disclosed embodiment is a signal having a high frequency ranging from about 2 kHz to 4 kHz, a distance between the two microphones for optimal beamforming may be set to range from about 50 mm to 85 mm. 
         [0215]    Meanwhile, the sound obtainer  248  includes the filter F in order to remove the noise indicative of the peripheral noise from the signal beamformed by the beamformer B and to separate the sound generated when carbon dioxide is jetted through the nozzle  243 . The filter F may include a 34 th  FIR filter having about 2 kHz of cutoff frequency. Alternatively, the filter F may include a band pass filter which passes a frequency of a band ranging from about 2 kHz to 4 kHz. Since noise, which is emphasized in a band of about 2 kHz or more or in the band ranging from about 2 kHz to 4 kHz in everyday life, is not uncommon while the sound generated when carbon dioxide is jetted through the nozzle  243  is emphasized in the band ranging from about 2 kHz to 4 kHz, the above-described filter F is used. 
         [0216]    The controller  270  calculates an RMS value of the signal passing through the filter F, and determines whether there is insufficient carbon dioxide based on the calculated RMS value. Since a description thereof is the same as the above-described description, the description thereof will be omitted. 
         [0217]    When it is determined that there is insufficient carbon dioxide by comparing the RMS value with the reference value, the controller  270  turns the lamp  230   c  provided in the cylinder replacement display  236   b  of the user interface unit on to notify the user of the replacement time of the cylinder  251 . 
         [0000]    The carbonated water producing apparatus and the refrigerator having the same according to one embodiment notify the user of the replacement time of the cylinder exactly. 
         [0218]    Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.