Abstract:
A method for controlling devices connected together, and which includes determining a type of a first device when the first device is connected to a transmitting device, determining what key buttons on a remote controller are needed to operate the detetermined type of the first device, activating the key buttons on the remote controller that are needed to operate the determined type of the first device, receiving an input signal indicating a selection of at least one key button needed to operate the determined type of the first device, transmitting the received input signal to a second device that is different than the first device, generating, by the second device, a remote control signal corresponding to the received input signal, transmitting, by the second device, the generated remote control signal to the first device, and performing a function on the first device corresponding the input signal indicating the selection of said at least one key button on the remote controller.

Description:
CROSS-REFERENCE TO A RELATED APPLICATION 
       [0001]    Pursuant to 35 U.S.C. §119(a), this application claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2009-0082187, filed on Sep. 1, 2009, Korean Application No. 10-2009-0089320, filed on Sep. 22, 2009, and Korean Application No. 10-2009-0089499, filed on Sep. 22, 2009, the contents of which are hereby incorporated by reference herein in their entireties. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a method for controlling an external device and a remote controller thereof, and more particularly, to a method for controlling an external device in a system transmitting and receiving a media signal using a wireless network. 
         [0004]    2. Discussion of the Related Art 
         [0005]    A display device includes a receiver that receives a media signal including video and audio from a broadcasting system, a cable system, and other external apparatuses (VCR, DVD, etc.) and processes and outputs the received media signal. The display device also includes a display unit that displays the video of the processed media signal on a screen. In addition, the receiver and the display unit can be individually separated from each other. For example, a wireless type display system can transmit a media signal received using an additional receiving device through wireless communication and displays the transmitted media signal on the display. 
         [0006]    The display device can also be interfaced with several different types of devices such as a disc player, home theatre systems, game player devices, etc. Thus, the user must operate several different remote control devices to operate the individual devices. The operation of the several different devices is often cumbersome and tedious for users. 
       SUMMARY OF THE INVENTION 
       [0007]    Accordingly, an object of the present invention is to address the above-noted and other problems. 
         [0008]    Another object of the present invention is to provide a novel system and method for operating devices connected together. 
         [0009]    To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, the present invention provides in one aspect a method for controlling devices connected together, and which includes determining a type of a first device when the first device is connected to a transmitting device, determining what key buttons on a remote controller are needed to operate the detetermined type of the first device, activating only the key buttons on the remote controller that are needed to operate the determined type of the first device, receiving an input signal indicating a selection of at least one key button needed to operate the determined type of the first device, transmitting the received input signal to a second device that is different than the first device, generating, by the second device, a remote control signal corresponding to the received input signal, transmitting, by the second device, the generated remote control signal to the first device, and performing a function on the first device corresponding the input signal indicating the selection of said at least one key button on the remote controller. 
         [0010]    In another aspect, the present invention provides a system for controlling devices connected together, and which includes a display device including a remote control interace and an extraction device, a remote control configured to interface and control an operation of the display device through the remote control interface, and a transmitting device configured to interface with an external apparatus and the display device. Further, when an input key is selected on the remote control intended for performing an operation on the external apparatus, the remote control is further configured to generate a first remote control signal including control data corresponding to performing the operation on the external apparatus and to transmit the remote control signal to the remote control interface of the display device, the display device is further configured to convert the first remote control signal received from the remote control including the control data into a wireless control communication signal different than the first remote control signal and to transmit the wireless communication signal to the transmitting device, and the transmitting device is further configured to receive the wireless communication signal from the receciving device, generate a second remote control signal that includes the control data and transmit the second remote control signal including the control data to the external apparatus such that the external apparatus can be operated via the remote control interfacing with the display device. 
         [0011]    Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings, which are given by illustration only, and thus are not limitative of the present invention, and wherein: 
           [0013]      FIG. 1  is a block diagram of a transmitting/receiving system according to an embodiment of the present invention; 
           [0014]      FIG. 2  is a block diagram illustrating a transmitting/receiving system according to another embodiment of the present invention; 
           [0015]      FIG. 3  is a block diagram illustrating a transmitting device according to an embodiment of the present invention; 
           [0016]      FIG. 4  is a block diagram illustrating a receiving device and a remote controller according to an embodiment of the present invention; 
           [0017]      FIG. 5  is a flowchart illustrating a method for controlling an external device according to an embodiment of the present invention; 
           [0018]      FIG. 6  is a flowchart illustrating a method for controlling an external device according to an embodiment of the present invention; 
           [0019]      FIG. 7  is a diagram illustrating a code format of an infrared signal according to an embodiment of the present invention; 
           [0020]      FIG. 8  is a block diagram illustrating a transmitting/receiving system according to yet another embodiment of the present invention; 
           [0021]      FIG. 9  is a block diagram illustrating a transmitting/receiving system according to still another embodiment of the present invention; 
           [0022]      FIG. 10  is a block diagram illustrating a remote controller according to an embodiment of the present invention; 
           [0023]      FIG. 11  is a flowchart illustrating a method for controlling an external device according to a third embodiment of the present invention; 
           [0024]      FIGS. 12 to 14  are diagrams illustrating methods for displaying a key button of a remote controller according to an embodiment of the present invention; 
           [0025]      FIG. 15  is a block diagram illustrating a transmitting/receiving system according to another embodiment of the present invention; 
           [0026]      FIG. 16  is a diagram illustrating a method for displaying a key button of a remote controller according to another embodiment of the present invention; 
           [0027]      FIG. 17  is a block diagram illustrating a transmitting/receiving system according to still another embodiment of the present invention; and 
           [0028]      FIGS. 18 to 20  are diagrams illustrating a method for displaying a key button of a remote controller according to other embodiments of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0029]    Hereinafter, a method for controlling an external device and a remote controller thereof according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
         [0030]      FIG. 1  is a block diagram illustrating a signal transmitting/receiving system according to an embodiment of the present invention. As shown, the transmitting/receiving system includes a transmitting device  100  and a receiving device  200 . Further, the transmitting device  100  receives a media signal including video and audio from a broadcasting system, a cable system, or external apparatuses and converts the received media signal into data of a wireless transmittable format and wirelessly transmits the data to the receiving device  200 . 
         [0031]    The receiving device  200  then receives and processes data wirelessly transmitted from the transmitting device  100  using one or more wireless communication schemes for wirelessly transmitting and receiving data previously established between the transmitting device  100  and the receiving device  200 . The receiving device  200  may also be a television or a receiving device  200  associated with a television. Further, the transmitting device  100  includes various input terminals such as a high-definition multimedia interface (HDMI) terminal connected with an antenna or external apparatuses, a universal serial bus (USB) terminal, a component terminal, an external input terminal, an RGB terminal, an antenna cable terminal, etc. and can receive the media signal using the input terminals. For example, the media signal may include a media signal received using the antenna, a cable, or the like or video signals and audio signals received from connected external devices in the transmitting device  100 . 
         [0032]    In addition, the transmitting device  100  may be a set-top box (STB) that receives the media signal using a wired or wireless network and converts and wireless transmits the received media signal to the receiving device  200 . However, the transmitting device  100  according to an embodiment of the present invention is not limited to the set-top box (STB) and may include all kinds of devices that can receive the media signal transmitted from the outside and wirelessly transmit the received media signal to the receiving device  200 . For example, the transmitting device  100  may be implemented by being provided in a computer or a portal terminal such as a cellular phone, etc. 
         [0033]    Further, the receiving device  200  receives and processes the data wirelessly transmitted from the transmitting device  100 , and thereafter outputs the video or audio included in the media signal. For example, the receiving device  200  can convert the video signal wirelessly transmitted from the transmitting device  100  into a displayable format and output the video signal on a display screen. More specifically, when the video signal wireless transmitted from the transmitting device  100  is encoded by a coding scheme such as an MPEG, etc., the receiving device  200  decodes the received video signal to output the decoded video signal to the display screen. 
         [0034]    According to one embodiment of the present invention, the transmitting device  100  and the receiving device  200  can transmit and receive the media signal using various wireless communication schemes, for example, wireless communication schemes such as wireless HD (WiHD), wireless home digital interface (WHDi), wireless Lan (WiFi), etc. In more detail, the WiHD uses a frequency band of approximately 60 GHz and can transmit and receive data at a transmission rate of approximately 4 Gbps to thereby transmit HD video data of 1080p (1902×1080) without compression. However, WiHD uses a high frequency band of 60 GHz such that a data transmitting/receiving distance is approximately 10 m and the transmission/reception quality may be easily influenced by obstacles in the vicinity of an installation space. 
         [0035]    In addition, WHDi can transmit and receive the data at transmission rate of approximately 1.8 Gbps using a frequency band of approximately 5 GHz. Further, WHDi uses a comparatively low high frequency band of 5 GHz such that the data transmitting/receiving distance is approximately 30 m and the transmission/reception quality is not greatly influenced by obstacles in the vicinity of the installation space. Meanwhile, when HD video data of 1080p (1920×1080) is transmitted using WHDi at the transmission rate of approximately 1.8 Gbps, the transmitting device  100  needs to partially compress and transmit the HD video data. 
         [0036]    Further, WiFi can transmit and receive the data at transmission rate of approximately 54 Mbp using a frequency band of approximately 2.4 GHz. The WiFi also uses a comparatively low high frequency band of 2.4 GHz such that the data transmitting/receiving distance is approximately 50 to 200 m and the transmission/reception quality is not significantly influenced by obstacles in the vicinity of the installation space. Meanwhile, when HD video data of 1080p (1920×1080) is transmitted using WiFi at the low transmission rate of approximately 54 Mbp, the transmitting device  100  needs to compress and transmit the HD video data and as a result, the image quality of the video signal received from the receiving device  200  may be deteriorated. 
         [0037]    Further, the transmitting device  100  and the receiving device  200  can wirelessly transmit and receive data for the media signal using various short-range wireless communication schemes, for example, communication schemes such as Bluetooth, ZigBee, or binary code division multiple access (CDMA), etc. in addition to the above-mentioned wireless communication schemes. Also, the transmitting device  100  and the receiving device  200  can transmit video and audio data using any one of various wireless communication schemes. In addition, the transmitting device  100  and the receiving device  200  can transmit and receive the video and audio data using two or more schemes of the wireless communication schemes, for example, any one of two or more supportable schemes can be selected according to the performance, installation environment, video resolution, etc. of each of the transmitting device  100  and the receiving device  200  to be used for data transmission/reception. 
         [0038]    Next,  FIG. 2  is a block diagram illustrating a transmitting/receiving system according to another embodiment of the present invention. As shown, the system includes the transmitting device  100 , the receiving device  200 , an external apparatus  300 , and a remote controller  400 . The transmitting device  100  and the receiving device  200  were discussed with respect to  FIG. 1 . Also, as discussed above, the transmitting device  100  and the receiving device  200  can transmit and receive data using a wireless communication scheme, i.e., WiHD, WHDi, WiFi, or the like. 
         [0039]    In addition, the transmitting device  100  is connected to the external apparatus  300  and can receive a video signal and an audio signal from the external apparatus  300 . For example, the transmitting device  100  can include input/output terminals such as an HDMI, a USB, a component, an RGB, etc. for transmitting and receiving data to and from the external apparatus  300 . Further, the external apparatus  300  may be various devices including a video playing device such as a DVD player, a Divix player, a blue-ray player, or the like, a set-top box such as an IPTV set-top box, a cable set-top box, a satellite set-top box, or the like, a PC, a game machine, a home theater, a portable terminal, a hard disk (HDD) recorder, etc. However, the external apparatus  300  connected to the transmitting device  100  according to the embodiment of the present invention is not limited to the above-mentioned devices and may include various devices that are connected to the transmitting device  100  to output a media signal such as the video signal to the transmitting device  100 . 
         [0040]    In addition, the remote controller  400  transmits a remote control signal for controlling the receiving device  200  according to a user input, and the receiving device  200  receives the remote control signal from the remote controller  400  to perform an operation corresponding to the remote control signal. For example, the remote controller  400  includes a plurality of key buttons for a user&#39;s key input and generates and transmits a remote control signal corresponding to the user&#39;s input for any one of the plurality of key buttons to the receiving device  200 . 
         [0041]    More specifically, the remote controller  400  can generate and transmit an infrared signal corresponding to the user&#39;s key input, and the receiving device  200  can receive the infrared signal and perform an operation corresponding to the received infrared signal. For example, the remote controller  400  and the receiving device  200  can include an IR transmitter and an IR receiver for transmitting and receiving the infrared signal, respectively. However, the present invention is not limited to transmission and reception of the remote control signal using the infrared communication scheme and the remote control signal can be transmitted and received between the remote controller  400  and the receiving device  200  using various wireless communication methods, for example, a communication method using an RF signal or an optical signal different than the infrared communication scheme. 
         [0042]    According to an embodiment of the present invention, the remote controller  400  can also transmit a remote control signal for controlling the external apparatus  300 , for example, an infrared signal to the receiving device  200 . That is, the remote controller  400  can receive key inputs corresponding to a predetermined operation of the external apparatus  300  from a user, and generate and transmit an infrared signal corresponding to the key inputs to the receiving device. In this instance, the receiving device  200  receives the infrared signal for the external apparatus  300  from the remote controller  400  and wirelessly transmits data for controlling the external apparatus  300 , which is included in the received infrared signal to the transmitting device  100 . Thus, the receiving device  200  converts the signal received for the remote controller  400  (e.g., an infrared signal) into a WiHD, WHDi, WiFi, etc. signal used to communicate with the transmitting device  100 . 
         [0043]    More specifically, the receiving device  200  wirelessly transmits control data for the external apparatus  300  to the transmitting device  100  using a wireless network connected to the transmitting device  100 , for example, the wireless communication scheme such as the WiHD, WHDi, WiFi, or the like. In addition, the transmitting device  100  can wirelessly receive the control data from the receiving device  200  and transmit the received control data to the external apparatus  300 . Therefore, the external apparatus  300  can perform an operation corresponding to user&#39;s key input using the remote controller  400 . 
         [0044]    Also, in order to control the external apparatus  300 , the transmitting device  100 , and the receiving device  200  shown in  FIG. 2 , the user previously had to use a plurality of remote control devices corresponding to the devices. Also, in order to control any one device of the devices, the user had to move near a location adjacent to the device with the correct remote control device and perform key input in the remote control device, which corresponds to his/her desired operation. Therefore, when the external apparatus  300  is installed far away from the receiving device  200 , the user who watches a broadcast at a location adjacent to the receiving device  200  has to inconveniently move to the location where the corresponding apparatus is installed in order to control the external apparatus  300 . 
         [0045]    However, according to an embodiment of the present invention, the receiving device  200  receives the remote control signal for controlling the external apparatus  300  connected to the transmitting device  100  from the remote controller  400  and transmits the control data for the received remote control signal to the transmitting device  100  using the wireless communication scheme connected to the transmitting device  100  to allow the corresponding device to perform an operation corresponding to the remote control signal. Thus, the user can control the operation of the external apparatus  300  using the remote controller  400  at a location adjacent to the receiving device  200 . 
         [0046]    Further, when the receiving device  200  is a television, the user usually is watching the screen of the television. Thus, the user can continue to view the television while controlling the external apparatus  300 . That is, the user does not have to stop viewing the television to control the external apparatus  300 , but can continually look at or view information on the television while controlling the external apparatus  300 . 
         [0047]    Next,  FIG. 3  is a block diagram illustrating a transmitting device according to an embodiment of the present invention. As shown, the transmitting device  100  includes an interface unit  110 , a first signal processing unit  120 , a first RF transmitting/receiving unit  130 , an IR generation unit  140 , and an IR transmitting unit  150 . In addition, the interface unit  110  transmits and receives a signal to and from the external apparatus  300  via input terminals such as an HDMI, a USB, a component, an RGB, etc. for connecting the external apparatus  300 . 
         [0048]    In addition, the first signal processing unit  120  can convert signals received from the external apparatus  300 , for example, a video signal and an audio signal into data of a wireless transmittable format in accordance with a predetermined wireless communication scheme and output the converted data. For example, when the signals received from the external apparatus  300  are encoded by a coding scheme such as MPEG, the first signal processing unit  120  can include an A/V processing unit for decoding the video and audio signals received from the external apparatus  300 . 
         [0049]    Also, the first RF transmitting/receiving unit  130  wirelessly transmits the signal output from the first signal processing unit  120  to the receiving device  200 . To do this, the first RF transmitting/receiving unit  130  includes an antenna and a converter, i.e., an up-converter and a down-converter. Further, according to the embodiment of the present invention, the first RF transmitting/receiving unit  130  can receive control data for controlling the operation of the external apparatus  300  from the receiving device  200  using the wireless communication scheme, i.e., WiFi, WHDi, WiFi, or the like. 
         [0050]    In addition, the IR generation unit  140  generates a remote control signal for controlling the operation of the external apparatus  300 , that is, an infrared signal for the control data received from the receiving device  200 . Further, the IR transmitting unit  150  transmits the infrared signal generated by the IR generation unit  140  to the external apparatus  300  and the external apparatus  300  performs an operation corresponding to the infrared signal transmitted from the IR transmitting unit  150  of the transmitting device  100 . Therefore, the operation of the external apparatus  300  can be controlled using the infrared signal. 
         [0051]    According to another embodiment of the present invention, the transmitting device  100  can transmit the control data wirelessly transmitted from the receiving device  200  to the external apparatus  300  through the interface unit  110 . For example, the first signal processing unit  120  can convert the received control data into a signal of a format to be transmitted to the external apparatus  300  in accordance with an interface with the external apparatus  300  and output the signal, and the interface unit  110  can transmit the control data processed by the first signal processing unit  120  to the external apparatus  300 . Accordingly, the external apparatus  300  can receive the control data through the interface unit  110  of the transmitting device  100  and perform an operation corresponding to the inputted control data. 
         [0052]    Next,  FIG. 4  is a block diagram illustrating the receiving device  200  according to an embodiment of the present invention. As shown, the receiving device  200  includes a second RF transmitting/receiving unit  210 , a second signal processing unit  220 , a band pass filter  230 , and an IR receiving unit  240 . Further, the second RF transmitting/receiving unit  210  can wirelessly receive the media signal, for example, the video signal and the audio signal from the transmitting device  100  and for doing this includes an antenna and a converter, more specifically, an up-converter and a down-converter. 
         [0053]    In addition, the second signal processing unit  220  can convert the signal received by the second RF transmitting/receiving unit  210  into a format that can be output in a display device. For example, when the signal received from the transmitting device  100  is encoded in accordance with a coding scheme such as MPEG, etc., the second signal processing unit  220  includes an A/V processing unit for decoding the received video and audio signals. Also, the IR receiving unit  240  can receive an infrared signal for controlling the operation of the external apparatus  300  connected to the transmitting device  100  from the remote controller  400 . The band pass filter  230  also filters and extracts data for controlling the external apparatus  300  from the received infrared signal. Meanwhile, the extracted control data can be converted into a format wirelessly transmittable through the second signal processing unit  220 , and thereafter be transmitted to the transmitting device  100  through the second RF transmitting/receiving unit  210 . For example, the control data for the external apparatus  300  can be transmitted to the transmitting device  100  by using the wireless communication scheme such as the WiHD, WHDi, WiFi, or the like. 
         [0054]    Hereinafter, a method for processing a remote control signal according to an embodiment of the present invention will be described. In more detail, an example in which a control signal is transmitted and received between the remote controller  400  and the receiving device  200  and between the transmitting device  100  and the external apparatus  300  will be described. However, the present invention is not limited to transmission and reception of the control signal using the infrared communication scheme and the remote control signal may be transmitted and received using various wireless communication methods, for example, the communication method using the RF signal or the optical signal in addition to the infrared communication scheme. Components in  FIGS. 1 to 4  will also be referred to throughout the description. 
         [0055]    Turning first to  FIG. 5 , a flowchart illustrating a method for controlling an external device according to an embodiment of the present invention is shown. As shown in  FIG. 5 , the IR receiving unit  240  of the receiving device  200  receives an infrared signal transmitted from the remote controller  400  (step  500 ). As discussed above, the received infrared signal is a remote control signal for controlling an operation of the external apparatus  300  connected to the transmitting device  100 . In more detail, the remote controller  400  can receive key inputs for controlling the operation of the external apparatus  300  connected to the transmitting device  100 , and generate and transmit the infrared signal corresponding to the key inputs. The IR receiving unit  240  then receives the infrared signal transmitted from the remote controller  400 . 
         [0056]    Further, the band pass filter  230  extracts data for controlling the operation of the external apparatus  300  from the received infrared signal (step  510 ). For example, as shown in  FIG. 7 , the infrared signal received from the remote controller  400  includes a leader code, a custom code, and a data code as data for controlling the external apparatus  300 , and more specifically includes the leader code, the custom code, a custom code verification byte, the data code, and a data code verification byte. Further, each of the codes may have data of 2 bytes, that is, 8 bits and the infrared signal may include an ending signal bit ( 10 ). 
         [0057]    Meanwhile, the control data can be transmitted from the remote controller  400  to the receiving device  200  by being loaded on a carrier signal having a predetermined frequency and a predetermined duty ratio. That is, the remote controller  400  can generate a baseband signal as the control data corresponding to the operation of the external apparatus  300 , which the user inputs, and generate and transmit the infrared signal to the receiving device  200  by synthesizing the baseband signal with the carrier signal having the predetermined frequency and the predetermined duty ratio. Further, the carrier signal may have a frequency of 30 kHz to 60 kHz and a duty ratio of 1/2 to 1/3. The signals transmitted from the remote control  400  to the receiving device  200  will hereinafter be referred to as remote control signal or infrared signal. 
         [0058]    Thus, according to the embodiment of the present invention, the infrared signal can be transmitted by synthesizing the baseband signal including the control data of the external apparatus  300  with the carrier signal having the frequency of 37 kHz and the duty ratio 1/3. For example, in the control data included in the baseband signal, the leader code may be constituted by a high of 9 ms and a low of 4.5 ms, bit ‘ 1 ’ may be constituted by a high of 0.56 ms and a low of 1.69 ms, and bit ‘ 0 ’ may be constituted by a high of 0.56 ms and a low of 0.565 ms. Further, the leader code, the custom code, and the data code may constitute one frame and the frame may be repeated at a cycle of 108 ms. 
         [0059]    Also, in step  510 , the band pass filter  230  can extract the baseband signal including the control data for the external data  300  by filtering the infrared signal received from the remote controller  400 , and in which the baseband signal may be an envelope of the received infrared signal. For example, the band pass filter  230  may be a 38 kHz band pass filter. Therefore, the band pass filter  230  can extract the control data for controlling the external apparatus  300  by removing only the carrier frequency from the infrared signal input from the IR receiving unit  240  to detect only waveforms of the leader code, the custom code, and the data code. 
         [0060]    The second RF transmitting/receiving unit  210  then wirelessly transmits the control data of the external apparatus  300 , which is extracted by the band pass filter  230  to the transmitting device  100  (step  520 ). For example, the second signal processing unit  220  can convert the control data included in the baseband signal output from the band pass filter  230 , that is, the leader code, the custom code, and the data code into data of a format which is wirelessly transmittable using the predetermined wireless communication scheme, i.e., the WiHD, the WHDi, the WiFi, or the like and output the signal to the second RF transmitting/receiving unit  210 . The second RF transmitting/receiving unit  210  can then wirelessly transmit the control data of the external apparatus  300 , which is output from the second signal processing unit  220 , to the transmitting device  100 . 
         [0061]    As described above, the receiving device  200  extracts the baseband signal from the infrared signal received from the remote controller  400  and wirelessly transmits only the control data of the external apparatus  300 , which is included in the baseband signal to the transmitting device  100  so as to reduce the amount of data wirelessly transmitted and received between the transmitting device  100  and the receiving device  200 . 
         [0062]    Next,  FIG. 6  is a flowchart illustrating a method for controlling a remote control signal according to an embodiment of the present invention. In particular,  FIG. 6  illustrates the transmitting device  100  processing the control data of the external apparatus  300 , which wirelessly transmitted from the receiving device  200  as described in  FIG. 5 . As shown  FIG. 6 , the first RF transmitting/receiving unit  130  of the transmitting device  100  receives the control data of the external apparatus  300 , which is wirelessly transmitted from the receiving device  200  (step  600 ). 
         [0063]    For example, the control data received into the first RF transmitting/receiving unit  130  may be data included in the baseband signal among the infrared signal received into the receiving device  200  from the remote controller  400  in order to control the external apparatus  300  connected to the transmitting device  100 . Further, in step S 600 , the control data of the external apparatus  300  received from the receiving device  200  includes the leader code, the custom code, and the data code. The IR generation unit  140  then generates an infrared signal, which is the remote control signal for controlling the operation of the external apparatus  300 , using the control data received in the first RF transmitting/receiving unit  130  (step  610 ). 
         [0064]    For example, the IR generation unit  140  can generate the baseband signal including the control data of the external apparatus  300  and generate the infrared signal by synthesizing the generated baseband signal with a carrier signal having a predetermined frequency and a predetermined duty ratio. More specifically, the IR generation unit  140  can generate the baseband signal to include the leader code, the custom code, and the data code of the control data received by the first RF transmitting/receiving unit  130 , and synthesize the generated baseband signal with a carrier signal having a frequency of 37 kHz and a duty ratio of 1/3 and output the generated infrared signal. Further, the IR transmitting unit  150  transmits the infrared signal generated to the external apparatus  300  in order to control the operation of the external apparatus  300  (step  620 ). Therefore, the external apparatus  300  performs an operation corresponding to the infrared signal received from the IR transmitting unit  150  of the transmitting device  100 . 
         [0065]    Next,  FIG. 8  is a block diagram illustrating a transmitting/receiving system according to another embodiment of the present invention. As shown in  FIG. 8 , a plurality of external apparatuses  300 ,  310 , and  320  are connected to the transmitting device  100 . The plurality of external apparatuses  300 ,  310 , and  320  may be apparatuses that are connected to the transmitting device  100  to supply the media signal, for example, the video signal and the audio signal to the transmitting device  100 . Further, the external apparatuses  300 ,  310 , and  320  may be various devices including a video playing device such a Divix player, a blue-ray player, or the like, a set-top box such as an IPTV set-top box, a cable set-top box, a satellite set-top box, or the like, a PC, a game machine, a home theater, a portable terminal, a hard disk recorder, etc. 
         [0066]    In addition, a user can perform key input for controlling the operation of any one of the plurality of external apparatuses  300 ,  310 , and  320  using the remote controller  400 , and the remote controller  400  then generates an infrared signal corresponding to the user&#39;s key input and transmits the generated infrared signal to the receiving device  200 . Thus, as described above, the receiving device  200  can extract the control data for controlling the corresponding external apparatus from the infrared signal received from the remote controller  400  and transmit the control data of the external apparatus to the transmitting device  100  using the wireless communication scheme such as the WiHD, WHDi, WiFi, or the like. 
         [0067]    Also, when the received remote control signal is the signal for controlling the operation of any one of the transmitting device  100  or the plurality of external apparatuses  300 ,  310 , and  320 , the received remote control signal can be wirelessly transmitted to the transmitting device  100  in addition to the apparatus identification information using the wireless communication scheme such as the WiHD, WHDi, WiFi, or the like. Further, the transmitting device  100  generates an infrared signal for controlling the corresponding external apparatus by using the control data received from the receiving device  200 , and for example, can generate the infrared signal by synthesizing the baseband signal including the control data with a carrier signal having a predetermined frequency and a predetermined duty ratio as discussed above. 
         [0068]    In addition, the transmitting device  100  transmits the generated infrared signal to the corresponding external apparatus. The transmitting device  100  can also verify which external apparatus of the plurality of external apparatuses  300 ,  310 , and  320  the control data is used to control by analyzing the received control data. For example, the transmitting device  100  generates the infrared signal using the received control data to transmit the generated infrared signal to the first external apparatus  300  when the received control data is used to control the first external apparatus  300 . 
         [0069]    Meanwhile, in  FIG. 8 , the remote controller  400  is shown, but according to another embodiment of the present invention, a plurality of remote controllers corresponding to the plurality of external apparatuses  300 ,  310 , and  320 , respectively may be provided. Accordingly, an infrared signal transmitted from a predetermined remote controller may be transmitted to an external apparatus corresponding to the remote controller among the plurality of external apparatuses  300 ,  310 , and  320  through the receiving device  200  and the transmitting device  100 . 
         [0070]    Next,  FIG. 9  is a block diagram illustrating a transmitting/receiving system according to another embodiment of the present invention. As shown in  FIG. 9 , a display device  700  includes the receiving device  200  having the above-mentioned configuration and a display module  710 . That is, the transmitting device  100  receives the media signal from the external apparatus  300  and wirelessly transmits the received media signal to the receiving device  200 , and the receiving device  200  provided in the display device  700  processes the wirelessly transmitted data into a video signal of a displayable format and outputs the processed data to the display module  710 . Thus, in this embodiment, the receiving device  200  is integrated within the display device  700 . 
         [0071]    Further, the display module  710  can display a video using the video signal input from the receiving device  200 . In particular, the display module  710  includes display panels of various display types such as a liquid crystal display (LCD), a plasma display panel (PDP), an electro luminescent display (ELD), a vacuum fluorescent display (VFD), etc. In addition, an IR receiving unit  720  provided in the display device  700  can receive the infrared signal for controlling the external apparatus  300 , which is transmitted from the remote controller  400 . Also, as described above, the receiving device  200  provided in the display device  700  extracts the control data of the external apparatus  300  from the infrared signal received from the remote controller  400  to wirelessly transmit the extracted control data to the transmitting device  100 . 
         [0072]    Next,  FIG. 10  is a block diagram illustrating the remote controller  400  according to an embodiment of the present invention. As shown, the remote controller  400  includes an RF receiving unit  410 , a control unit  420 , a user input unit  430 , and a control signal transmitting unit  440 . Further, the RF receiving unit  410  can receive information on the external apparatus  300  wirelessly transmitted from the transmitting device  100 . Also, the user input unit  430  includes a plurality of key buttons for user inputs or displays the plurality of key buttons using a touch panel to receive an input for controlling the operation of the external apparatus  300  from the user. The control signal transmitting unit  440  can also generate and transmit the user inputs using the user input unit  430 , that is, a remote control signal corresponding to the operation of the external apparatus  300  which the user wants. 
         [0073]    Thus, according to embodiments of the present invention, the control signal transmitting unit  440  of the remote controller  400  can transmit the generated remote control signal to the receiving device  200 . Further, the external apparatus  300  can be controlled by transmitting the remote control signal transmitted to the receiving device  200  through a wireless network in the transmitting device  100 . The control unit  420  also controls the overall operation of the remote controller  400 , i.e., the operations of the user input unit  430  and the control signal transmitting unit  440 . 
         [0074]    In addition, the control unit  420  can control the user input unit  430  to display changed key buttons for user&#39;s input depending on the external apparatus  300  connected to the transmitting device  100  using the information on the external apparatus  300  received from the transmitting device  100  or the receiving device  200  through the RF receiving unit  410 . 
         [0075]    In more detail,  FIG. 11  is a flowchart illustrating a method for controlling an external apparatus according to an embodiment of the present invention. As shown in  FIG. 11 , the RF receiving unit  410  receives the information on the external apparatus  300  from the transmitting device  100  or the receiving device  200 , i.e., a signal corresponding to the type of the external apparatus  300  (step  800 ). More specifically, the RF receiving unit  410  can receive the information on the external apparatus  300  from the transmitting device  100  using various wireless communication schemes such as Bluetooth, ZigBee, RF communication, or the like. The user input unit  430  then displays the changed key buttons for the user input depending on the received information on the external apparatus  300  (step  810 ), and the user can perform input operations for controlling the operation of the external apparatus  300  using the displayed key buttons (step  820 ). 
         [0076]    For example, the control unit  420  can determine the type of the external apparatus  300  connected to the transmitting device  100  and control the user input unit  430  to differently display the changed key buttons depending on the determined type of the external apparatus  300 . More specifically, the key buttons required to control the operation of the external apparatus  300  may be different from each other depending on the type of the external apparatus  300 . Thus, the user input unit  430  can display key buttons among the plurality of key buttons corresponding to the external apparatus  300 , that is, the key buttons required to control the operation of the external apparatus  300  to be identified to the user. 
         [0077]    In addition, in one embodiment of the present invention, the user input unit  430  can include the plurality of key buttons which the user can select and press and display the key buttons corresponding to the external apparatus  300  to be identified from the rest of key buttons among the plurality of key buttons. Thereafter, the control signal transmitting unit  440  generates the user&#39;s input using the user input unit  430 , that is, a remote control signal corresponding to the operation of the external apparatus  300  which the user wants (step  830 ) and transmits the generated remote control signal to the receiving device  200  (step  840 ). 
         [0078]    For example, as shown in  FIG. 12 , the remote controller  400 , more specifically, the user input unit  430  provided in the remote controller  400  includes a plurality of key buttons, i.e., a power on/off button  431 , numeric buttons  432 , channel up/down buttons  433 , volume up/down buttons  434 , and buttons  435  for playing video. Further,  FIG. 13  is a diagram illustrating the remote controller  400  shown in  FIG. 12  displaying changed key buttons depending on the external apparatus  300 . In this example, the external apparatus  300  connected to the transmitting device  100  through the external input is a ‘DVD player’. By considering the operation of the external apparatus  300  which is the ‘DVD player’, the numeric buttons  432  and the channel up/down buttons  433  among the key buttons shown in  FIG. 12  are key buttons that are not required to control the external apparatus  300 . 
         [0079]    Therefore, as shown in  FIG. 13 , the remote controller  400  displays the power on/off button  431 , the volume up/down buttons  434 , and the buttons  435  for playing the video that are required to control the external apparatus  300  which is the ‘DVD player’ to be identified from the rest of the unnecessary numeric buttons  432  and channel up/down buttons  433 . More specifically, the power on/off button  431 , the volume up/down buttons  434 , and the buttons  435  for playing the video corresponding to the external apparatus  300  are turned on and the rest of the numeric buttons  432  and channel up/down buttons  433  are turned off and thus are displayed dark. 
         [0080]    In more detail, each of the key buttons  431 - 435  provided in the remote controller  400  include light sources controlled by the control unit  420 . Thus, only the key buttons among the plurality of key buttons  431 - 435  corresponding to the external apparatus  300 , that is, the power on/off button  431 , the volume up/down buttons  434 , and the buttons  435  for playing the video are activated or lit, while the rest of the numeric buttons  432  and channel up/down buttons  433  are deactivated. Further, even if the key buttons that do not correspond to the external apparatus  300 , that is, the numeric buttons  432  and the channel up/down buttons  433  are pressed by the user, the resulting operation is not performed. 
         [0081]    According to yet another embodiment of the present invention, the user input unit  430  can display the key buttons corresponding to the external apparatus  300 , that is, only key buttons required to control the operation of the external apparatus  300 . For example, as shown in  FIG. 14 , the remote controller  400 , more specifically, the user input unit  430  includes a touch panel  450  for displaying the plurality of key buttons and receiving the user input for the displayed key buttons. 
         [0082]    Further, the control unit  420  displays only the key buttons corresponding to the external apparatus  300  on the touch panel  450 . That is, when the external apparatus  300  connected to the transmitting device  100  through the external input is the ‘DVD player’, only the key buttons corresponding to the external apparatus  300 , that is, the power on/off button  431 , the volume up/down buttons  434 , and the buttons  435  for playing the video that are required to control the operation of the external apparatus  300  are displayed on the touch panel  450  as shown in  FIG. 14 . 
         [0083]    Next,  FIG. 15  is a block diagram illustrating a transmitting/receiving system according to yet another embodiment of the present invention. As shown in  FIG. 15 , the plurality of external apparatuses  300 ,  310 , and  320  are connected to the transmitting device  100 . As discussed previously, the plurality of external apparatuses  300 ,  310 , and  320  may be apparatuses that are connected to the transmitting device  100  to supply the media signal, for example, the video signal and the audio signal to the transmitting device  100 . Further, the external apparatuses  300 ,  310 , and  320  may be various devices including a video playing device such a Divix player, a blue-ray player, or the like, a set-top box such as an IPTV set-top box, a cable set-top box, a satellite set-top box, or the like, a PC, a game machine, a home theater, a portable terminal, a hard disk recorder, etc. 
         [0084]    In addition, the transmitting device  100  receives a signal, i.e., the video signal and the audio signal from any one of the plurality of external apparatuses  300 ,  310 , and  320  through an external input of a signal to be wirelessly transmitted to the receiving device  200 . Also, as described above, the transmitting device  100  wirelessly transmits information on any external apparatus connected to the external input among the plurality of external apparatuses  300 ,  310 , and  320  to the remote controller  400 . Further, the remote controller  400  displays changed key buttons for user&#39;s input depending on the information on the external apparatus, which is received from the transmitting device  100 . For example, when the transmitting device  100  is connected to the second external apparatus  310  which is the ‘DVD player’ through the external input, the transmitting device  100  transmits information indicating that the currently connected external apparatus is the second external apparatus  310  which is the ‘DVD player’ to the remote controller  400 . 
         [0085]    Therefore, as shown in  FIG. 16 , key buttons corresponding to the ‘DVD player’ are displayed on the user input unit  430  provided in the remote controller  400 , for example, the touch panel  450 , and information indicating that the external apparatus which can be currently controlled by using the remote controller  400  is the ‘DVD player’ is displayed at a predetermined region  454 . According to yet another embodiment of the preset invention, as shown in  FIG. 15 , the remote controller  400  can directly transmit the remote control signal for controlling the external apparatus to the corresponding external apparatus. 
         [0086]    That is, when the user who uses the remote controller  400  is positioned sufficiently close or adjacent to the external apparatus to be controlled, the remote controller  400  can directly transmit the remote control signal to the corresponding external apparatus. However, when the user is positioned adjacent to the receiving device  200  that is far away from the external apparatus, the remote controller  400  transmits the remote control signal to the receiving device  200  so as to transmit the remote control signal to the corresponding external apparatus through the receiving device  200  and the transmitting device  100  as described above. 
         [0087]    Next,  FIG. 17  is a block diagram illustrating a transmitting/receiving system according to still another embodiment of the present invention. As shown in  FIG. 17 , the plurality of remote controllers  400 ,  401 , and  402  are used to control the plurality of external apparatuses  300 ,  310 , and  320 , respectively. Further, the plurality of remote controller  400 ,  401 , and  402  can receive information on a particular external apparatus among the plurality of external apparatuses  300 ,  310 , and  320 , which is connected to the external input from the transmitting device  100 . Meanwhile, the plurality of remote controllers  400 ,  401 , and  402  can verify whether or not to control the external apparatus currently connected through the external input using the information on the external apparatus, which is received from the transmitting device  100 . 
         [0088]    Therefore, information indicating whether or not to control the currently selected external apparatus can be displayed on each of the plurality of remote controller  400 ,  401 , and  402 . For example, when the transmitting device  100  is connected to the second external apparatus  310  which is the ‘DVD player’ through the external input, the transmitting device  100  can transmit information indicating that the currently connected external apparatus is the second external apparatus  310  which is the ‘DVD player’ to the remote controllers  400 ,  401 , and  402 . The plurality of remote controllers  400 ,  401 , and  402  that receive the information on the external apparatuses can verify whether or not to control the second external apparatus  310 . In this instance, the second remote controller  401  can control the second external apparatus  310  connected to the transmitting device  100  through the external input and the rest of the remote controllers do not control the second external apparatus  310 . 
         [0089]    Referring to  FIG. 18 , the remote controller  400  (and other remote controllers) can include a display having a region  436  indicating whether or not the corresponding controller can control the external apparatus. In this example, the region  436  indicates that the second external apparatus  310  cannot be controlled using the remote controller  400  (e.g., the light is turned off in the region  436  indicating the apparatus  310  can not be controlled). Further, at the same time, all key buttons  431 - 435  can be maintained in a deactivated state indicating the first remote controller  400  cannot control the second external apparatus  310  selected as the external input. 
         [0090]    Meanwhile, referring to  FIG. 19 , the second remote controller  401  that can control the second external apparatus  310  selected as the external input turns on the light in the region  436  and at the same time activates the power on/off button  431 , the volume up/down buttons  434 , and the buttons for playing the video to indicate the remote controller  401  can control the second external apparatus  310 . Further, referring to  FIG. 20 , the remote controller  401  can include a display region  455  for displaying the external apparatus that can be controlled (the DVD player in this example). 
         [0091]    In addition, the embodiments of the present invention have been described using the situation where the remote controller  400  receives the information on the external apparatus  300  from the transmitting device  100 . However, the present invention is not limited to this arrangement. For example, the remote controller  400  can receive the information on the external apparatus  300  currently connected to the transmitting device  100  from the receiving device  200 . To do this, the receiving device  200  receives the information on the external apparatus  300  from the transmitting device  100  using the wireless network or previously stores the information. 
         [0092]    Thus, according to embodiments of the present invention, a receiving device receives a remote control signal for an external apparatus connected to a transmitting device and wirelessly transmits the remote control signal to the transmitting device to control the external apparatus, such that a user who uses the receiving device can control external apparatuses provided in a transmitting/receiving system using a remote control device such as a remote controller, etc., thereby improving the user&#39;s convenience. Further, it is possible to easily control a plurality of external apparatuses with a small number of key buttons by displaying changed key buttons of the remote control device depending on the external apparatus connected to the transmitting device, thereby improving the user&#39;s convenience. 
         [0093]    In addition, embodiments of the present invention can be implemented by a computer-readable recording medium in which a program to be executed is recorded. The described embodiments can be stored in a computer-readable recording medium by being produced as a program to be executed in a computer. An example of the computer-readable recording medium includes a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage, etc. and in addition, also includes Internet transmissions. The computer-readable recording media are distributed on computer systems connected through a network, and thus a computer-readable code may be stored and executed by a distribution scheme. In addition, a functional program, a code, and code segments for implementing the control method will be easily interred by programmers skilled in the art. 
         [0094]    The present invention encompasses various modifications to each of the examples and embodiments discussed herein. According to the invention, one or more features described above in one embodiment or example can be equally applied to another embodiment or example described above. The features of one or more embodiments or examples described above can be combined into each of the embodiments or examples described above. Any full or partial combination of one or more embodiment or examples of the invention is also part of the invention. 
         [0095]    As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.