Abstract:
A method for use in an electronic device having an interface unit, comprising: selecting a first pin set from a plurality of pin sets that are part of the interface unit, wherein the first pin set is associated with a first communication channel; grounding a second pin set in the plurality of pin sets, wherein the second pin set is associated with a second communication channel; and processing a signal for the first pin set.

Description:
CLAIM OF PRIORITY 
       [0001]    This application claims priority under 35 U.S.C. §119(a) to Korean Application Serial No. 10-2015-0046260, which was filed in the Korean Intellectual Property Office on Apr. 1, 2015, the entire content of which is hereby incorporated by reference. 
       TECHNICAL FIELD 
       [0002]    The present disclosure relates to electronic devices in general, and more particularly to an apparatus and a method for processing a signal in an electronic device. 
       BACKGROUND 
       [0003]    In general, electronic devices have various functions and can perform a complex function. The electronic devices may access each other and exchange signals. For example, the electronic devices may access each other wirelessly or through a wire. That is, the electronic devices may access each other through a cable. The electronic devices may use various types of interfaces. That is, the electronic devices may include ports, and the ports may be connected through the cable. The ports of the electronic devices may have various interface structures. Accordingly, the electronic devices may exchange signals through the cable. 
         [0004]    However, the electronic devices have a problem in that the access is not easy. That is, according to interface structures of the electronic devices, the cable is determined. This is because, for the access of the electronic device, the cable should support all of the interface structures of the electronic devices. Accordingly, if users of the electronic devices do not have proper cables, the electronic devices cannot access each other. Therefore, the use efficiency of the electronic devices is low and the convenience of the users is also low. 
       SUMMARY 
       [0005]    According to aspects of the disclosure, a method is provided in an electronic device having an interface unit, comprising: selecting a first pin set from a plurality of pin sets that are part of the interface unit, wherein the first pin set is assoicated with a first communication channel; grounding a second pin set in the plurality of pin sets, wherein the second pin set is associated with a second communication channel; and processing a signal for the first pin set. 
         [0006]    According to aspects of the disclosure, an apparatus is provided comprising: an interface unit comprising a plurality of pin sets; a signal processing unit for processing a signal; a grounding unit for grounding at least one of the plurlality of pin sets; and at least one controller configured to: select a first pin set from the plurality of pin sets, wherein the first pin set is assoicated with a first communication channel; ground a second pin set in the plurality of pin sets, wherein the second pin set is associated with a second communication channel; and process a signal for the first pin set. 
         [0007]    A non-transitory computer-readable medium storing one or more instructions which when executed by an electronic device cause the electronic device to perform a method comprising the steps of: selecting a first pin set from a plurality of pin sets that are part of an interface unit, wherein the first pin set is assoicated with a first communication channel; grounding a second pin set in the plurality of pin sets, wherein the second pin set is associated with a second communication channel; and processing a signal for the first pin set. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    The above and other aspects, features, and advantages of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: 
           [0009]      FIG. 1  is a block diagram of an example of a communication system, according to aspects of the disclosure; 
           [0010]      FIG. 2  is a block diagram of the communication system of  FIG. 1 , according to aspects of the disclosure; 
           [0011]      FIG. 3  is a block diagram of an example of an electronic device, according to aspects of the disclosure; 
           [0012]      FIG. 4  is a block diagram of an example of an interface, according to aspects of the disclosure; 
           [0013]      FIG. 5  is a block diagram of an example of a controller, according to aspects of the disclosure; 
           [0014]      FIG. 6  is a circuit diagram of an example of a connection unit, according to aspects of the disclosure; 
           [0015]      FIG. 7  is a flowchart of an example of a process, according to aspects of the disclosure; and 
           [0016]      FIG. 8  is a flowchart of an example of a process, according to aspects of the disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0017]    Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Here, it is noted that identical reference numerals denote the same structural elements in the accompanying drawings.  FIG. 1  is a block diagram of an example of a communication system, according to aspects of the disclosure. More particularly, as illustrated in  FIG. 1 , a communication system  10  including an electronic device  110  and an electronic device  120 . The electronic devices  110  and  120  may be the same or different from each other. 
         [0018]    The electronic devices  110  and  120  may connect to each other and exchange signals. The electronic devices  110  and  120  may communicate through a communication network. Additionally or alternatively, the electronic devices  110  and  120  may connect to each other through a wired connection. The electronic devices  110  and  120  may connect to each other through a cable  200 . The electronic devices  110  and  120  may have a signal interface structure. The cable  200  may support the single interface structure. For example, when the electronic devices  110  and  120  are the same, the electronic devices  110  and  120  may have the same interface structure. In instances in which the electronic devices  110  and  120  are different, the electronic devices  110  and  120  may have the same interface structure. 
         [0019]      FIG. 2  is a block diagram of the communication system of  FIG. 1 , according to aspects of the disclosure. More particularly, as illustrated in  FIG. 2 , the first electronic device  110  and the second electronic device  120  may connect to each other and exchange signals. For example, the first electronic device  110  and the second electronic device  120  may connect to each other via a wired connection. The first electronic device  110  and the second electronic device  120  may connect to each other through the cable  200 . 
         [0020]    The cable  200  may comport to an interface that is supported by both the first electronic device  110  and the second electronic device  120 . In this regard, the first electronic device  110  includes a first interface unit  111  and the second electronic device  120  includes a second interface unit  121 . For example, the first interface unit  111  and the second interface unit  121  have a single interface structure. The cable  200  may support the single interface structure. For example, when the first electronic device  110  and the second electronic device  120  are the same, the first interface unit  111  and the second interface unit  121  may have the same interface structure. When the first electronic device  110  and the second electronic device  120  are different, the first interface unit  111  and the second interface unit  121  may have the same interface structure. 
         [0021]    Between the first electronic device  110  and the second electronic device  120 , a plurality of communication channels  210  and  220  may be formed. That is, the first interface unit  111  and the second interface unit  121  may provide the communication channels  210  and  220 . Further, the cable  200  may support the communication channels  210  and  220 . The communication channels  210  and  220  may include detection paths  211  and  221 , transmission paths  213  and  223 , and reception paths  215  and  225 , respectively. The detection paths  211  and  221  may be used to detect the connection between the first electronic device  110  and the second electronic device  120  in the communication channels  210  and  220 . The transmission paths  213  and  223  may be used to transmit signals from the second electronic device  120  to the first electronic device  110 . The reception paths  215  and  225  may be used to transmit signals from the first electronic device  110  to the second electronic device  120 . 
         [0022]    Further, the first electronic device  110  may use both the communication channels  210  and  220 . For example, the first electronic device  110  may use one of the communication channels  210  and  220  to exchange communications with the second electronic device  120 . The first electronic device  110  may detect that it is connected to the second electronic device  120  through the detection paths  211  and  221 . Further, the first electronic device  110  may receive signals from the second electronic device  120  through the transmission paths  213  and  223 . Additionally or alternatively, the first electronic device  110  may transmit signals to the second electronic device  120  through the reception paths  215  and  225 . 
         [0023]    Additionally or alternatively, the second electronic device  120  may use one of the communication channels  210  and  220 . That is, the second electronic device  120  may use one of the communication channels  210  and  220  to exchange communications with the first electronic device  110 . The second electronic device  120  may detect that it is connected to the first electronic device  110  through one of the detection paths  211  and  221 . Further, the second electronic device  120  may transmit a signal to the first electronic device  110  through one of the transmission paths  213  and  223 . Additionally or alternatively, the second electronic device  120  may receive a signal from the first electronic device  110  through one of the reception paths  215  and  225 . 
         [0024]      FIG. 3  is a block diagram of an example of an electronic device, according to aspects of the disclosure. More particularly, as illustrated in  FIG. 3 , a signal processing device  300  according to the present embodiment includes a communication unit  310 , an input unit  320 , a display unit  330 , an interface unit  340 , a power supply unit  350 , a grounding unit  360 , a storage unit  370 , a controller  380 , and an audio processing unit  390 . 
         [0025]    The communication unit  310  may include a wireless communication unit. For example, the communication unit  310  may communicate with an external device through various communication schemes. In this regard, the communication unit  310  may connect to at least one of a mobile communication network and a data communication network. Additionally or alternatively, the communication unit  310  may perform short-range communications. The communication unit  310  may include an antenna (ANT)  311 . For example, the external device may include an electronic device, a base station, a server, and a satellite. The communication schemes may include Long Term Evolution (LTE), Wideband Code Division Multiple Access (WCDMA), Global System for Mobile Communications (GSM), Wi-Fi, Bluetooth, and Near Field Communications (NFC). 
         [0026]    The input unit  320  generates input data in the signal processing device  300 . For example, the input unit  320  may generate input data in accordance with a user input of the signal processing unit  300 . The input unit  320  may include at least one input means. The input unit  320  may include a keypad, a dome switch, a physical button, a touch panel, a jog &amp; shuttle, and a sensor. 
         [0027]    The display unit  330  outputs display data in the signal processing device  300 . The display unit  330  may include a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display, an Organic LED (OLED) display, a Micro Electro Mechanical System (MEMS) display, and an electronic paper display. The display unit  330  may include a plurality of light emitting diodes. The display unit  330  may be coupled with the input unit  320  to be implemented as a touch screen. 
         [0028]    The interface unit  340  provides an interface for the signal processing device  300 . For example, the interface unit  340  may have a single interface structure. To this end, the interface unit  340  may be connected to the external device through the cable  200 . 
         [0029]      FIG. 4  is a block diagram of an example of an interface, according to aspects of the disclosure. More particularly, as illustrated in  FIG. 4 , the interface unit  340  of the signal processing device  300  according to the present embodiment may include a plurality of detection pins  411  and  413 , a plurality of communication pin sets  420 ,  430 ,  440 ,  451 , and  453 , a plurality of power supply pins  461 ,  463 ,  465 , and  467 , and a plurality of ground pins  471 ,  473 ,  475 , and  477 . For example, an interface structure of the interface unit  340  is vertically symmetrical and horizontally symmetrical. The interface structure of the interface unit  340  may include twelve columns (labeled A and B) and two rows (labeled 1 through 12), such that pin addresses may be formed by concatenating the pins&#39; respective row and column labels. For example, the pin addresses may include A 1 , A 2 , A 3 , A 4 , A 5 , A 6 , A 7 , A 8 , A 9 , A 10 , A 11 , A 12 , B 1 , B 2 , B 3 , B 4 , B 5 , B 6 , B 7 , B 8 , B 9 , B 10 , B 11 , and B 12 . 
         [0030]    The detection pins  411  and  413  are provided to detect a connection to an external device by the signal processing device  300 . That is, the detection pins  411  and  413  are provided to determine the respective states of the communication channels  210  and  220 . For example, the detection pins  411  and  413  detect the communication channels  210  and  220 . When the signal processing device  300  forms the communication channels  210  and  220  with the external device, one of the detection pins  311  and  314  may detect one of the communication channels  210  and  220 . 
         [0031]    The detection pins  411  and  413  include a first detection pin  411  and a second detection pin  413 . The first detection pin  411  and the second detection pin  413  are vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the first detection pin  411  and the second detection pin  413  may be arranged in A 5  and B 5 . One of the first detection pin  411  or the second detection pin  413  may be an active detection pin, and the other may be an inactive detection pin. The active detection pin may be activated to indicate that one of the communication channels  210  and  220  are used to form a connection with an external device. The active detection pin may identify the first communication channel  210  and the second communication channel  220 . For example, the active detection pin may detect that one of the first communication channel  210  and the second communication channel  220  are used to form a connection with an external device. The inactive detection pin may be deactivated and may not be used for detecting the state of the communication channels  210  and  220 . 
         [0032]    The communication pin sets  420 ,  430 ,  440 ,  451 , and  453  are provided to exchange signals in the signal processing device  300 . That is, the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  transmit or receive signals. For example, at least one of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  may transmit or receive signals. 
         [0033]    The communication pin sets  420 ,  430 ,  440 ,  451 , and  453  may include a first communication pin set  420 , a second communication pin set  430 , a third communication pin set  440 , and fourth communication pin sets  451  and  453 . The first communication pin set  420  and the second communication pin set  430  may have the same transmission rate. Additionally or alternatively, the third communication pin set  440  and the fourth communication pin sets  451  and  453  may have transmission rates that are different from those of the first communication pin set and the second communication pin set. 
         [0034]    The first communication channel  210  may be allocated to the first communication pin set  420 . The first communication pin set  420  may include a first transmission pin set  421  and a first reception pin set  425 . The first communication pin set  420  may have a predetermined transmission rate. The first transmission pin set  421  may include a first positive transmission pin  422  and a first negative transmission pin  424 . The first reception pin set  425  may include a first positive reception pin  426  and a first negative reception pin  428 . The first transmission pin set  421  may transmit signals through the first communication channel  210 . The first positive transmission pin  422  may transmit a positive type signal through the first transmission path  213 , and the first negative transmission pin  424  may transmit a negative type signal through the first transmission path  213 . Additionally or alternatively, the first reception pin set  425  may receive signals through the first communication channel  210 . The first positive reception pin set  426  may receive a positive type signal through the first reception path  215 , and the first negative reception pin  428  may receive a negative type signal through the first reception path  215 . 
         [0035]    The second communication channel  220  may be allocated to the second communication pin set  430 . The second communication pin set  430  may include a second transmission pin set  431  and a second reception pin set  435 . The second communication pin set  430  may have the same transmission rate as that of the first communication pin set  420 . The second transmission pin set  431  may include a second positive transmission pin  432  and a second negative transmission pin  434 . The second reception pin set  435  may include a second positive reception pin  436  and a second negative reception pin  438 . The second transmission pin set  431  may transmit signals through the second communication channel  220 . The second positive transmission pin  432  may transmit a positive type signal through the second transmission path  223 , and the second negative transmission pin  434  may transmit a negative type signal through the second transmission path  223 . Additionally or alternatively, the second reception pin set  435  may receive signals through the second communication channel  220 . The second positive reception pin  436  may receive a positive type signal through the second reception path  225 , and the second negative reception pin  438  may receive a negative type signal through the second reception path  225 . 
         [0036]    The first communication pin set  420  and the second communication pin set  430  are vertically and horizontally symmetrical with respect to the center of the interface unit  340 . That is, the first transmission pin set  421  and the second transmission pin set  431  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . More specifically, the first positive transmission pin  422  and the second positive transmission pin  432  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 , and the first negative transmission pin  424  and the second negative transmission pin  434  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the first positive transmission pin  422  and the second positive transmission pin  432  may be arranged in A 2  and B 2 , and the first negative transmission pin  424  and the second negative transmission pin  434  may be arranged in A 3  and B 3 . Further, the first reception pin set  425  and the second reception pin set  435  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . More specifically, the first positive reception pin  426  and the second positive reception pin  436  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 , and the first negative reception pin  428  and the second negative reception pin  438  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the first positive reception pin  426  and the second positive reception pin  436  may be arranged in B 11  and A 11 , and the first negative reception pin  428  and the second negative reception pin  438  may be arranged in B 10  and A 10 . 
         [0037]    A third communication channel (not shown) may be allocated to the third communication pin set  440 . The third communication channel may be different from the first communication channel  210  and the second communication channel  220 . The third communication pin set  440  may have a transmission rate different from that of the first communication pin set  420  and the second communication pin set  430 . The third communication pin set  440  may include two positive communication pins  441  and  443  and two negative communication pins  445  and  447 . The positive communication pins  441  and  443  may transmit and receive positive type signals through the third communication channels. The negative communication pins  445  and  447  may transmit and receive negative type signals through the third communication channel. The positive communication pins  441  and  443  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the positive communication pins  441  and  443  may be arranged in A 6  and B 6 . Further, the negative communication pins  445  and  447  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the negative communication pins  445  and  447  may be arranged in A 7  and B 7 . 
         [0038]    The fourth communication pin sets  451  and  453  in the signal processing device  300  support the interface with the external device. The fourth communication pin sets  451  and  453  may support the third communication pin set  440 . That is, when the third communication pin set  440  transmits or receives a signal, the fourth communication pin sets  451  and  453  may transmit or receive an additional signal. Thus, in some implementations, the fourth communication pin sets  451  and  453  may have the same transmission rate as that of the third communication pin set. The fourth communication pin sets  451  and  453  may include a first sub pin  451  and a second sub pin  453 . The first sub pin  451  and the second sub pin  453  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the first sub pin  451  and the second sub pin  453  may be arranged in A 8  and B 8 . The power supply pins  461 ,  463 ,  465 , and  467  are provided to receive power in the signal processing device  300 . The power supply pins  461 ,  463 ,  465 , and  467  may receive power for driving the signal processing device  300 . The power supply pins  461 ,  463 ,  465 , and  467  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the power supply pins  461 ,  463 ,  465 , and  467  may be arranged in A 4 , A 9 , B 4 , and B 9 . 
         [0039]    The ground pins  471 ,  473 ,  475 , and  477  may be provided for a ground connection in the signal processing device  300 . The ground pins  471 ,  473 ,  475 , and  477  may ground the detection pins  411  and  413  and the power supply pins  461 ,  463 ,  465 , and  467 . The ground pins  471 ,  473 ,  475 , and  477  may be vertically and horizontally symmetrical with respect to the center of the interface unit  340 . For example, the ground pins  471 ,  473 ,  475 , and  477  may be arranged in A 1 , A 12 , B 1 , and B 12 . 
         [0040]    The power supply unit  350  supplies power to the signal processing device  300 . The power supply unit  350  may receive power from the power supply pins  461 ,  463 ,  465 , and  467  of the interface unit  340 . Further, the power supply unit  350  may supply power to the components of the signal processing device  300 . 
         [0041]    The grounding unit  360  grounds the signal processing device  300 . The grounding unit  360  may ground the elements of the signal processing device  300 . Further, the grounding unit  360  may be connected to the ground pins  471 ,  473 ,  475 , and  477  of the interface unit  340 . 
         [0042]    The storage unit  370  may include any suitable type of volatile or non-volatile memory, such as Random-access Memory (RAM), Read-Only Memory (ROM), 
         [0043]    Network Accessible Storage (NAS), cloud storage, a Solid State Drive (SSD), etc. The storage unit  370  stores operation programs of the signal processing device  300 . The storage unit  370  may store a program for processing a signal of one of the communication channels  210  and  220 . The storage unit  370  may store a program for connecting the other communication channel  210  or  220  to the grounding unit  360 . In some implementations, the storage unit  370  may store data generated during the execution of the operation programs. 
         [0044]    The controller  380  may include any suitable type of processing circuitry, such as one or more general-purpose processors (e.g., ARM-based processors), a Digital Signal Processor (DSP), a Programmable Logic Device (PLD), an Application-Specific 
         [0045]    Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), etc. In operation, the controller  380  may transmit or receive a signal through at least one of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453 . To this end, the controller  380  may select one of the first communication pin set  420 , the second communication pin set  430 , and the third communication pin set  440 . When the third communication pin set  440  is selected, the controller  380  may determine whether to use the fourth communication pin sets  451  and  453 . 
         [0046]    The controller  380  may determine the states of the communication channels  210  and  220 . The controller  380  may detect the state of one of the first communication channel  210  and the second communication channel  220  through the detection pins  411  and  413  of the interface unit  340 . In response to the detection, the controller  380  may select one of the first communication pin set  420  and the second communication pin set  430 . The controller  380  may ground the other communication pin set  420  or  430 . The controller  380  may process (e.g., generate) a signal for transmission over one of the first communication pin set  420  and the second communication pin set  430 . 
         [0047]      FIG. 5  is a block diagram of an example of a controller, according to aspects of the disclosure. More particularly, as illustrated in  FIG. 5 , the controller  380  of the signal processing device  300  according to the present embodiment may include a detection unit  510 , a signal processing unit  520 , and a connection unit  530 . 
         [0048]    The detection unit  510  may detect the states of the communication channels  210  and  220 . The detection unit  510  may detect the states of the communication channels  210  and  220  by using the detection pins  411  and  413  of the interface unit  340 . The detection unit  510  may detect the states of the communication channels  210  and  220  through one of the detection pins  411  and  413 , for example, the active detection pin. Accordingly, the detection unit  510  detects one of the communication channels  210  and  220 . When the signal processing device  300  forms the communication channels  210  and  220  with the external device, the active detection pin may detect one of the communication channels  210  and  220 . 
         [0049]    Further, the detection unit  510  may select one of the first communication pin set  420  and the second communication pin set  430 . When the first communication channel  210  is detected, the detection unit  510  may select the first communication pin set  420 . Additionally or alternatively, when the second communication channel  220  is detected, the detection unit  510  may select the second communication pin set  430 . The detection unit  510  may generate a selection signal indicating the selection. The detection unit  510  may generate a first selection signal when the first communication pin set  420  is selected and a second selection signal when the second communication pin set  430  is selected. For example, the first selection signal may be a high signal and the second selection signal may be a low signal. 
         [0050]    The signal processing unit  520  may process a signal for one of the communication channels  210  and  220 . The signal processing unit  520  may process a signal to be transmitted to one of the communication channels  210  and  220 . Additionally or alternatively, the signal processing unit  520  may process a signal received from one of the communication channels  210  and  220 . The signal processing unit  520  may include a transmitter for encoding and modulating the signal to be transmitted and a receiver for demodulating and decoding the signal. The signal processing unit  520  may include a MODEM and a CODEC. The CODEC may include a data CODEC for processing packet data and the like, and an audio CODEC for processing an audio signal such as a voice and the like. 
         [0051]    The connection unit  530  controls connections for the communication channels  210  and  220 . That is, the connection unit  530  controls connections between the first communication pin set  420 , the second communication pin set  430 , the signal processing unit  520 , and the grounding unit  360 . The connection unit  530  may connect one of the first communication pin set  420  and the second communication pin set  430  to the signal processing unit  520 . The connection unit  530  may connect the other communication pin set  420  or  430  to the grounding unit  360 . When the detection unit  510  selects the first communication pin set  420 , the connection unit  530  may connect the first communication pin set  420  to the signal processing unit  520  and the second communication pin set  430  to the grounding unit  360 . Additionally or alternatively, when the detection unit  510  selects the second communication pin set  430 , the connection unit  530  may connect the second communication pin set  430  to the signal processing unit  520  and the first communication pin set  420  to the grounding unit  360 . For example, the connection unit  530  may include a switching device. 
         [0052]      FIG. 6  is a circuit diagram of an example of a connection unit, according to aspects of the disclosure. More particularly, as illustrated in  FIG. 6 , the connection unit  530  may include a detection terminal  610 , a first communication terminal set  620 , a second communication terminal set  630 , a connection terminal set  640 , a ground terminal  650 , a first connection switch set  660 , a second connection switch set  670 , a first ground switch set  680 , and a second ground switch set  690 . 
         [0053]    The detection terminal  610  may be connected to the detection unit  510 . The detection terminal  610  may receive a signal from the detection unit  510  in accordance with one of the first communication pin set  420  and the second communication pin set  430 . The selection signal may include a first selection signal corresponding to the first communication pin set  420  and a second selection signal corresponding to the second communication pin set  430 . For example, the first selection signal may be a high-level signal and the second selection signal may be a low signal. 
         [0054]    The first communication terminal set  620  may be connected to the first communication pin set  420  of the interface unit  340 . The first communication terminal set  620  may include a first transmission terminal set  621  and a first reception terminal set  625 . The first transmission terminal set  621  may include a first positive transmission terminal  622  and a first negative transmission terminal  624 . The first reception terminal set  625  may include a first positive reception terminal  626  and a first negative reception terminal  628 . The first transmission terminal set  621  may be connected to the first transmission pin set  421 . The first positive transmission terminal  622  may be connected to the first positive transmission pin  422 , and the first negative transmission terminal  624  may be connected to the first negative transmission pin  424 . Additionally or alternatively, the first reception terminal set  625  may be connected to the first reception pin set  425 . The first positive reception terminal  626  may be connected to the first positive reception pin  426 , and the first negative reception terminal  628  may be connected to the first negative reception pin  428 . 
         [0055]    The second communication terminal set  630  may be connected to the second communication pin set  430  of the interface unit  340 . The second communication terminal set  630  may include a second transmission terminal set  631  and a second reception terminal set  635 . The second transmission terminal set  631  may include a second positive transmission terminal  632  and a second negative transmission terminal  634 . The second reception terminal set  635  may include a second positive reception terminal  636  and a second negative reception terminal  638 . The second transmission terminal set  631  may be connected to the second transmission pin set  621 . The second positive transmission terminal  632  may be connected to the second positive transmission pin  432 , and the second negative transmission terminal  634  may be connected to the second negative transmission pin  434 . Additionally or alternatively, the second reception terminal set  635  may be connected to the second reception pin set  435 . The second positive reception terminal  636  may be connected to the second positive reception pin  436 , and the second negative reception terminal  638  may be connected to the second negative reception pin  438 . 
         [0056]    The connection terminal set  640  may be connected to the signal processing unit  520 . The connection terminal set  640  may include an output terminal set  641  and an input terminal set  645 . The output terminal set  641  may include a positive output terminal  642  and a negative output terminal  644 . The input terminal set  645  may include a positive input terminal  646  and a negative input terminal  648 . 
         [0057]    The ground terminal  650  may be connected to the grounding unit  360 . 
         [0058]    The first connection switch set  660  may be disposed between the first communication terminal set  620  and the connection terminal set  640 . The first connection switch set  660  may include a first positive output switch  661 , a first negative output switch  663 , a first positive input switch  665 , and a first negative input switch  667 . The first positive output switch  661  may be arranged between the first positive transmission terminal  622  and the positive output terminal  642 , and the first negative output switch  663  may be arranged between the first negative transmission terminal  624  and the negative output terminal  644 . The first positive input switch  665  may be arranged between the first positive reception terminal  626  and the positive input terminal  646 , and the first negative input switch  667  may be arranged between the first negative reception terminal  628  and the negative input terminal  648 . 
         [0059]    The first connection switch set  660  may connect the first communication terminal set  620  to the connection terminal set  640  or release the connection between the first communication terminal set  620  and the connection terminal set  640  in accordance with the selection signal of the detection unit  510 . That is, when the first selection signal is received through the detection terminal  610 , the first connection switch set  660  may be closed and may connect the first communication terminal set  620  to the connection terminal set  640 . The first positive output switch  661 , the first negative output switch  663 , the first positive input switch  665 , and the first negative input switch  667  may be collectively closed. Additionally or alternatively, when the second selection signal is received through the detection terminal  610 , the first connection switch set  660  may be opened and may release the connection between the first communication terminal set  620  and the connection terminal set  640 . The first positive output switch  661 , the first negative output switch  663 , the first positive input switch  665 , and the first negative input switch  667  may be collectively opened. 
         [0060]    The second connection switch set  670  may be disposed between the second communication terminal set  630  and the connection terminal set  640 . The second connection switch set  670  may include a second positive output switch  671 , a second negative output switch  673 , a second positive input switch  675 , and a second negative input switch  677 . The second positive output switch  671  may be disposed between the second positive transmission terminal  632  and the positive output terminal  642 , and the second negative output switch  673  may be disposed between the second negative transmission terminal  634  and the negative output terminal  644 . The second positive input switch  675  may be disposed between the second positive reception terminal  636  and the positive input terminal  646 , and the second negative input switch  677  may be disposed between the second negative reception terminal  638  and the negative input terminal  648 . 
         [0061]    The second connection switch set  670  may connect the second communication terminal set  630  to the connection terminal set  640  or release the connection between the second communication terminal set  630  and the connection terminal set  640  in accordance with the selection signal of the detection unit  510 . That is, when the first selection signal is received through the detection terminal  610 , the second connection switch set  670  may be opened and may release the connection between the second communication terminal set  630  and the connection terminal set  640 . The second positive output switch  671 , the second negative output switch  673 , the second positive input switch  675 , and the second negative input switch  667  may be collectively opened. Additionally or alternatively, when the second selection signal is received through the detection terminal  610 , the second connection switch set  670  may be closed and may connect the second communication terminal set  630  and the connection terminal set  640 . The second positive output switch  671 , the second negative output switch  673 , the second positive input switch  675 , and the second negative input switch  667  may be collectively closed. 
         [0062]    The first ground switch set  680  may be disposed between the first communication terminal set  620  and the ground terminal  650 . The first ground switch set  680  may include a plurality of first ground switches  681 ,  683 ,  685 , and  687 . The first ground switches  681 ,  683 ,  685 , and  687  may be disposed between the first positive transmission terminal  622  and the ground terminal  650 , between the first negative transmission terminal  624  and the ground terminal  650 , between the first positive reception terminal  626  and the ground terminal  650 , and between the first negative reception terminal  628  and the ground terminal  650 . 
         [0063]    The first ground switch set  680  may connect the first communication terminal set  620  to the ground terminal  650  or release the connection between the first communication terminal set  620  and the ground terminal  650  in accordance with the selection signal of the detection unit  510 . That is, when the first selection signal is received through the detection terminal  610 , the first ground switch set  680  may be opened and may release the connection between the first communication terminal set  620  and the ground terminal  650 . The first ground switches  681 ,  683 ,  685 , and  687  may be collectively opened. Additionally or alternatively, when the second selection signal is received through the detection terminal  610 , the first ground switch set  680  may be closed and may connect the first communication terminal set  620  and the ground terminal  650 . The first ground switches  681 ,  683 ,  685 , and  687  may be collectively closed. 
         [0064]    The second ground switch set  690  may be disposed between the second communication terminal set  630  and the ground terminal  650 . The second ground switch set  690  may include a plurality of second ground switches  691 ,  693 ,  695 , and  697 . The second ground switches  691 ,  693 ,  695 , and  697  may be disposed between the second positive transmission terminal  632  and the ground terminal  650 , between the second negative transmission terminal  634  and the ground terminal  650 , between the second positive reception terminal  636  and the ground terminal  650 , and between the second negative reception terminal  638  and the ground terminal  650 . 
         [0065]    The second ground switch set  690  may connect the second communication terminal set  630  to the ground terminal  650  or release the connection between the second communication terminal set  630  and the ground terminal  650  in accordance with the selection signal of the detection unit  510 . Additionally or alternatively, when the first selection signal is received through the detection terminal  610 , the second connection switch set  690  may be closed and may connect the second communication terminal set  630  and the ground terminal  650 . The second ground switches  691 ,  693 ,  695 , and  697  may be collectively closed. Additionally or alternatively, when the second selection signal is received through the detection terminal  610 , the second connection switch set  690  may be opened and may connect the second communication terminal set  630  and the ground terminal  650 . The second ground switches  691 ,  693 ,  695 , and  697  may be collectively opened. 
         [0066]    The audio processing unit  390  may process an audio signal. For example, the audio processing unit  390  includes a speaker (SPK)  391  and a microphone (MIC)  393 . That is, the audio processing unit  390  may reproduce the audio signal through the speaker  391 . The audio processing unit  390  may collect the audio signal through the microphone  393 . 
         [0067]      FIG. 7  is a flowchart of an example of a process, according to aspects of the disclosure. More particularly, as illustrated in  FIG. 7 , the signal processing method according to the present embodiment starts detecting a connection with an external device by the controller  380  in operation  711 . For example, the interface unit  340  may be connected to the external device. The interface unit  340  may be connected to the external device through the cable  200 . When the interface unit  340  is connected to the external device, the controller  380  may detect the connection to the external device through one of the detection pins  411  and  413 . The detection unit  510  may detect the connection of the external device by using the active detection pin. For example, when the interface unit  340  is connected to the external device, one of the communication channels  210  and  220  may be established between the active detection pin and the external device. When one of the communication channels  210  and  220  is formed, an impedance change may be generated in the active detection pin. Accordingly, the detection unit  510  detects the impedance change in the active detection pin and thus detects the connection of the external device. 
         [0068]    Subsequently, when the connection of the external device is detected in operation  711 , the controller  380  detects the respective states of the communication channels  210  and  220  in operation  713 . The controller  380  may detect the respective states of the communication channels  210  and  220  through one of the detection pins  411  and  413 . The detection unit  510  may identify the first communication channel  210  and the second communication channel  220  through the active detection pin. Further, the detection unit  510  may detect one of the first communication channel  210  and the second communication channel  220  through the active detection pin. 
         [0069]    Subsequently, the controller  380  controls connections of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  in operation  715 . That is, the controller  380  controls the connections of the first communication pin set  420  and the second communication pin set  430  according to the states of the communication channels  210  and  220 . For example, the connection unit  530  may control connections between the first communication pin set  420 , the second communication pin set  430 , the signal processing unit  520 , and the grounding unit  360 . The connection unit  530  may connect one of the first communication pin set  420  and the second communication pin set  430  to the signal processing unit  520 . The connection unit  530  grounds the other communication pin set  420  or  430 . 
         [0070]      FIG. 8  is a flowchart of an example of a process, according to aspects of the disclosure. More particularly, as illustrated in  FIG. 8 , the controller  380  may select one of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  in operation  811 . The controller  380  may select one of the first communication pin set  420  and the second communication pin set  430  according to the states of the communication channels  210  and  220 . The detection unit  510  may select one of the first communication pin set  420  and the second communication pin set  430  in accordance with one of the first communication channel  210  and the second communication channel  220 . That is, when the first communication channel  210  is detected, the detection unit  510  may select the first communication pin set  420 . Additionally or alternatively, when the second communication channel  220  is detected, the detection unit  510  may select the second communication pin set  430 . 
         [0071]    The detection unit  510  may generate a selection signal in accordance with one of the first communication pin set  420  and the second communication pin set  430 . For example, when the first communication pin set  420  is selected, the detection unit  510  may generate a first selection signal. As another example, when the second communication pin set  430  is selected, the detection unit  510  may generate a second selection signal. Further, the detection unit  510  may output the selection signal to the detection terminal  610  of the connection unit  530 . 
         [0072]    Next, the controller  380  connects the selected one of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  to the signal processing unit  520  in operation  813 . For example, the controller  380  connects one of the first communication set  420  and the second communication pin set  430  to the signal processing unit  520 . That is, when the first communication pin set  420  is selected, the connection unit  530  may connect the first communication pin set  420  to the signal processing unit  520 . Additionally or alternatively, when the second communication pin set  430  is selected, the connection unit  530  may connect the second communication pin set  430  to the signal processing unit  520 . 
         [0073]    The connection unit  530  may connect one of the first communication pin set  420  and the second communication pin set  430  to the signal processing unit  520  in accordance with the selection signal of the detection unit  510 . For example, when the first selection signal is received through the detection terminal  610 , the first connection switch set  660  may be closed and the second connection switch set  670  may be opened. Accordingly, the first connection switch set  660  may connect the first communication terminal set  620  and the connection terminal set  640 , and the second connection switch set  670  may release the connection between the second communication terminal set  630  and the connection terminal set  640 . Additionally or alternatively, when the second selection signal is received through the detection terminal  610 , the first connection switch set  660  may be opened and the second connection switch  670  set may be closed. Accordingly, the first connection switch set  660  may release the connection between the first communication terminal set  620  and the connection terminal set  640 , and the second connection switch set  670  may connect the second communication terminal set  630  to the connection terminal set  640 . 
         [0074]    Next, the controller  380  connects one or more of the remaining communication pin sets of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  to the grounding unit  360  in operation  815 . The controller  380  may connect the other communication pin set  420  or  430  to the grounding unit  360 . That is, when the first communication pin set  420  is selected, the connection unit  530  may connect the second communication pin set  430  to the grounding unit  360 . Additionally or alternatively, when the second communication pin set  430  is selected the connection unit  530  may connect the first communication pin set  420  to the grounding unit  360 . Thereafter, the controller  380  may proceed to operation  717 . 
         [0075]    The connection unit  530  may connect the other communication pin set  420  or  430  to the grounding unit  360  in accordance with the selection signal of the detection unit  510 . For example, when the first selection signal is received through the detection terminal  610 , the first ground switch set  680  may be opened and the second ground switch set  690  may be closed. Accordingly, the first ground switch set  680  may release the connection between the first communication terminal set  620  and the ground terminal  650 , and the second ground switch set  690  may connect the second communication terminal set  630  and the ground terminal  650 . Additionally or alternatively, when the second selection signal is received through the detection terminal  610 , the first ground switch set  680  may be closed and the second ground switch  690  set may be opened. Accordingly, the first ground switch set  680  may connect the first communication terminal set  620  and the ground terminal  650 , and the second ground switch set  690  may release the connection between the second communication terminal set  630  and the ground terminal  650 . 
         [0076]    Lastly, the controller  380  processes a signal for one of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  and process/transmits the signal, in operation  717 . That is, the controller  380  may process a signal for one of the communication channels  210  and  220 . When the first communication pin set  420  is connected to the signal processing unit  520 , the signal processing unit  520  may process a signal the first communication channel  210 . The signal processing unit  520  may transmit the signal to the first communication channel  210  or receive the signal from the first communication channel  210  through the first communication pin set  420 . Additionally or alternatively, when the second communication pin set  430  is connected to the signal processing unit  520 , the signal processing unit  520  may process a signal for the second communication channel  220 . The signal processing unit  520  may transmit the signal to the second communication channel  220  or receive the signal from the second communication channel  220  through the second communication pin set  430 . 
         [0077]    The signal processing unit  520  may process the signal and output the processed signal through the output terminal set  640  of the connection unit  530 . For example, when the first connection switch set  660  is closed and the second connection switch set  670  is opened, the signal may be transmitted to the first transmission terminal set  621  from the output terminal set  641  and transmitted through the first transmission set  421 . Additionally or alternatively, when the first connection switch set  660  is opened and the second connection switch set  670  is closed, the signal may be transmitted to the second transmission terminal set  631  from the output terminal set  641  and transmitted through the second transmission set  431 . Additionally or alternatively, the signal processing unit  520  may receive the signal through the input terminal set  645  of the connection unit  530  and process the received signal. For example, when the first connection switch set  660  is closed and the second connection switch set  670  is opened, the signal may be received through the first reception pin set  425  and transferred to the input terminal set  645  from the first reception terminal set  625 . Additionally or alternatively, when the first connection switch set  660  is opened and the second connection switch set  670  is closed, the signal may be received through the second reception pin set  435  and transferred to the input terminal set  645  from the second reception terminal set  635 . 
         [0078]    When processing a signal for one of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453 , the signal processing device  300  may ground the remaining communication pin sets of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453 . Accordingly, the signal processing device  300  may prevent electromagnetic interference between the communication pin sets  420 ,  430 ,  440 ,  451 , and  453 . That is, the signal processing device  300  may prevent the signal from flowing into the remaining communication pin sets of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453 . Further, the signal processing device  300  may suppress electromagnetic connections between the communication pin sets  420 ,  430 ,  440 ,  451 , and  453  and the antenna  311 . That is, the signal processing device  300  may prevent the signal from flowing into the antenna  311  through the remaining communication pin sets of the communication pin sets  420 ,  430 ,  440 ,  451 , and  453 . Accordingly, the capability of the interface of the signal processing device  300  can be improved. 
         [0079]    Therefore, because the electronic devices  100 ,  110 , and  120  have the single interface structure in the communication system  10 , the electronic devices  100 ,  110 , and  120  can connect to each other. Accordingly, users of the electronic devices  100 ,  110 , and  120  can easily connect the electronic devices  100 ,  110 , and  120  through the single cable  200 . As a result, the use efficiency and the convenience of the users of the electronic devices  100 ,  110 , and  120  can be improved. 
         [0080]      FIGS. 1-8  are provided as an example only. At least some of the operations discussed with respect to these figures can be performed concurrently, performed in different order, and/or altogether omitted. It will be understood that the provision of the examples described herein, as well as clauses phrased as “such as,” “e.g.”, “including”, “in some aspects,” “in some implementations,” and the like should not be interpreted as limiting the claimed subject matter to the specific examples. 
         [0081]    The above-described aspects of the present disclosure can be implemented in hardware, firmware or via the execution of software or computer code that can be stored in a recording medium such as a CD-ROM, a Digital Versatile Disc (DVD), a magnetic tape, a RAM, a floppy disk, a hard disk, or a magneto-optical disk or computer code downloaded over a network originally stored on a remote recording medium or a non-transitory machine-readable medium and to be stored on a local recording medium, so that the methods described herein can be rendered via such software that is stored on the recording medium using a general purpose computer, or a special processor or in programmable or dedicated hardware, such as an ASIC or FPGA. As would be understood in the art, the computer, the processor, microprocessor controller or the programmable hardware include memory components, e.g., RAM, ROM, Flash, etc. that may store or receive software or computer code that when accessed and executed by the computer, processor or hardware implement the processing methods described herein. In addition, it would be recognized that when a general purpose computer accesses code for implementing the processing shown herein, the execution of the code transforms the general purpose computer into a special purpose computer for executing the processing shown herein. Any of the functions and steps provided in the Figures may be implemented in hardware, software or a combination of both and may be performed in whole or in part within the programmed instructions of a computer. No claim element herein is to be construed under the provisions of 35 U.S.C. 112, sixth paragraph, unless the element is expressly recited using the phrase “means for”. 
         [0082]    Moreover, the embodiments disclosed in this specification are suggested for the description and understanding of technical content but do not limit the range of the present disclosure. Accordingly, the range of the present disclosure should be interpreted as including all modifications or various other embodiments based on the technical idea of the present disclosure.