JP2013081134A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user to select an appropriate output destination for outputting a voice data to be reproduced from a source device, and to view a content in an appropriate state.SOLUTION: A communication device includes: first detection means for detecting whether or not a first voice output device is associated with a first channel; second detection means for detecting, when a second voice output device is connected to the first voice output device, whether or not the second voice output means is associated with the first channel; and control means for, using at least one detection means out of the first detection means and the second detection means, controlling to transmit to the first voice output device either a first voice data associated with the first channel or a second voice data associated with a second channel different from the first channel.

Description

  The present invention relates to a communication device that transmits audio data.

  Currently, a communication system that conforms to the High Definition Multimedia Interface (HDMI) (registered trademark) standard has been proposed (hereinafter referred to as “HDMI system”). The HDMI system includes a source device for transmitting video data and audio data, and a sink device for viewing video data and audio data received from the source device.

  In recent years, in order to view multi-channel audio data played back by a source device, an HDMI system is known in which a source device and a sink device are connected to different audio output devices, and the audio output device and the sink device are connected. Yes.

  In such an HDMI system, the user can select whether the audio data reproduced from the source device is output from the audio output device or the sink device.

  In the HDMI system as described above, it is known to automatically select whether the audio data reproduced from the source device is output from the audio output device or the sink device depending on the type of the source device. (Patent Document 1).

JP 2007-124552 A

  However, when the source device plays back multi-channel audio data, even if the output destination of audio data is selected according to the type of source device, select a device that does not support multi-channel audio data output. May end up. In this case, there is a problem in that the multi-channel audio data reproduced by the source device is not properly output, and the user cannot view content including the multi-channel audio data.

  Accordingly, an object of the present invention is to select an appropriate output destination in order to output audio data reproduced from a source device so that a user can view content in an appropriate state.

  In the communication apparatus according to the present invention, the first audio data corresponding to the first channel and the second audio data corresponding to the second channel different from the first channel are used as the first audio. Transmission means for transmitting to the output device, first detection means for detecting whether or not the first audio output device corresponds to the first channel, the first audio output device, and the second When the second audio output device is connected to the second audio output device, the second audio output device detects whether or not the second audio output device corresponds to the first channel, the first detection device, and the second detection device. Control means for controlling the transmission means using at least one of the detection means.

  According to the present invention, an appropriate output destination is selected to output audio data reproduced from the source device, and the user can view the content in an appropriate state.

It is an example of the block diagram which shows the communication system which concerns on Example 1 of this invention. It is an example of the flowchart which shows the selection process which concerns on Example 1 of this invention. It is an example of the flowchart which shows the audio | voice output process which concerns on Example 1 of this invention. It is an example of the block diagram which shows the communication system which concerns on Example 2 of this invention. It is an example of the flowchart which shows the selection process which concerns on Example 2 of this invention. It is an example of the flowchart which shows the audio | voice output process which concerns on Example 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the following examples are merely examples, and the present invention is not limited to the following examples.

[Example 1]
As shown in FIG. 1, the communication system according to the first embodiment includes a communication device 100, a first audio output device 200, a second audio output device 300, a connection cable 400, a connection cable 500, and a connection cable 600. The communication device 100 and the first audio output device 200 are connected via a connection cable 400. The first audio output device 200 and the second audio output device 300 are connected via a connection cable 500. Furthermore, the first audio output device 200 and the audio output device 300 are connected via a connection cable 600.

  The communication device 100 is a data output device that can transmit video data, audio data, and auxiliary data to the first audio output device 200 via the connection cable 400. The first audio output device 200 displays the video data received from the communication device 100 and the second audio output device 300 on a display, and the audio data received from the communication device 100 and the second audio output device 300 is a speaker. It is an electronic device that outputs from. Further, the first audio output device 200 can output audio data to the second audio output device 300 via the connection cable 600. The second audio output device 300 can transmit video data, audio data, and auxiliary data to the first audio output device 200 via the connection cable 500. Further, the second audio output device 300 can output the audio data received from the first audio output device 200 from the speaker. The communication device 100, the first audio output device 200, and the second audio output device 300 can transmit and receive control commands using at least one of the connection cable 400 and the connection cable 500.

  In the first embodiment, the communication device 100, the display device 200, the audio output device 300, the connection cable 400, and the connection cable 500 are assumed to conform to the HDMI (High Definition Multimedia Interface) standard. Therefore, the communication device 100 is a source device that functions as an HDMI source (Source) in the HDMI standard, and the first audio output device 200 is a sink device that functions as an HDMI sink (Sink) in the HDMI standard. The second audio output device 300 is a repeater device that functions as an HDMI repeater in the HDMI standard.

  In the first embodiment, the communication device 100, the first audio output device 200, and the second audio output device 300 are assumed to conform to the CEC (Consumer Electronics Control) protocol defined in the HDMI standard. Control commands transmitted between the communication device 100, the first audio output device 200, and the second audio output device 300 conform to the CEC protocol. Hereinafter, a control command conforming to the CEC protocol is referred to as a “CEC command”.

  In the first embodiment, a digital video camera (hereinafter “video camera”) is used as an example of the communication apparatus 100 below. Note that the communication device 100 is not limited to a video camera, and an electronic device such as a digital still camera, a recorder, a player, or a mobile phone may be used as the communication device 100 as long as the device operates as an HDMI source.

  In the first embodiment, hereinafter, a television receiver (hereinafter referred to as “TV”) is used as an example of the first audio output device 200. Note that the first audio output device 200 is not limited to the television, and an electronic device such as a projector or a personal computer may be used as the first audio output device 200 as long as the device operates as an HDMI sink.

  In the first embodiment, an AV amplifier (hereinafter referred to as “amplifier”) is used as an example of the second audio output device 300. Note that the second audio output device 300 is not limited to an amplifier, and an electronic device such as a set-top box or an audio processor may be used as the second audio output device 300 as long as the device operates as an HDMI repeater. Good.

  In the first embodiment, an HDMI cable corresponding to HDMI is used as an example of the connection cable 400 and the connection cable 500. Note that the connection cable 400 and the connection cable 500 may be interfaces compatible with HDMI. Note that the connection cable 400 and the connection cable 500 may be wired interfaces or wireless interfaces. In addition, as an example of the connection cable 400 and the connection cable 500, it may correspond to DiVA (Digital Interface for Video and Audio).

  In the first embodiment, an optical cable is used as an example of the connection cable 600. Of course, the connection cable 600 is not limited to an optical cable, and may be an analog cable or a wireless interface as long as the interface can transmit audio data.

  Hereinafter, in the first embodiment, the communication device 100 is referred to as “video camera 100”, the first audio output device 200 is referred to as “television 200”, and the second audio output device 300 is referred to as “amplifier 300”. In the first embodiment, the connection cable 400 is referred to as “HDMI cable 400”, the connection cable 500 is referred to as “HDMI cable 500”, and the connection cable 600 is referred to as “optical cable 600”.

  Next, the HDMI cable 400 will be described with reference to FIG.

  The HDMI cable 400 includes a power transmission line, an HPD (Hot Plug Detect) line, and a TMDS (Transition Minimized Differential Signaling) line 401. Further, the HDMI cable 400 includes a DDC (Display Data Channel) line 402 and a CEC line 403.

  The TMDS line 401 is a transmission line for transmitting video data, audio data, and auxiliary data from the video camera 100 to the television 200. The TMDS line 401 includes a TMDS channel 0, a TMDS channel 1, a TMDS channel 2, and a TMDS clock channel.

  The DDC line 402 is a transmission line for transmitting device information of the television 200 from the television 200 to the video camera 100.

  The device information of the television 200 is EDID (Extended display identification data) or E-EDID (Enhanced EDID) of the television 200. Both EDID and E-EDID include, as device information of the television 200, identification information of the television 200 relating to the television 200, information relating to the display capability of the television 200, information relating to the audio output capability of the television 200, and the like. For example, EDID and E-EDID include information on resolution, scanning frequency, aspect ratio, color space, and the like supported by the television 200. E-EDID is an extension of EDID and includes more capability information than EDID. For example, the E-EDID includes information related to the format of video data and audio data supported by the television 200. Hereinafter, both EDID and E-EDID are referred to as “EDID”.

  The CEC line 403 is a transmission line for bidirectionally transmitting a CEC command between the video camera 100 and the television 200. The television 200 can control the video camera 100 by transmitting a CEC command for controlling the video camera 100 to the video camera 100 via the CEC line 403. Further, the video camera 100 can receive a CEC command from the television 200 via the CEC line 403.

  Similar to the HDMI cable 400, the HDMI cable 500 includes a power transmission line, an HPD line, a TMDS line 501, a DDC line 502, and a CEC line 503.

  The TMDS line 501 is a transmission line for transmitting video data, audio data, and auxiliary data from the amplifier 300 to the television 200. The TMDS line 501 includes a TMDS channel 0, a TMDS channel 1, a TMDS channel 2, and a TMDS clock channel.

  The DDC line 502 is a transmission line for transmitting the EDID of the television 200 from the television 200 to the amplifier 300.

  The CEC line 503 is a transmission line for bidirectionally transmitting a CEC command between the amplifier 300 and the television 200. The television 200 can control the amplifier 300 by transmitting a CEC command for controlling the amplifier 300 to the amplifier 300 via the CEC line 503. In addition, the amplifier 300 can receive a CEC command from the television 200 via the CEC line 503.

<Video camera 100>
Next, an example of the configuration of the video camera 100 will be described with reference to FIG.

  As illustrated in FIG. 1, the video camera 100 includes a CPU (Central Processing Unit) 101, a memory 102, a communication unit 103, a display unit 104, an operation unit 105, an imaging unit 106, a recording unit 107, and a recording medium 108. Hereinafter, the video camera 100 will be described.

  The CPU 101 controls the video camera 100 according to a computer program stored in the memory 102. The CPU 101 can also control the video camera 100 using the EDID of the television 200. The CPU 101 controls the video camera 100 by analyzing data supplied from the video camera 100.

  The memory 102 functions as a work area for the CPU 101. Information stored in the memory 102 includes EDID of the television 200, identification information of the television 200 and the amplifier 300, capability information of the amplifier 300, and the like. The memory 102 also records settings relating to flags for the operation of each unit. The memory 102 also records the results of calculations and analysis performed by the CPU 101. The memory 102 stores information indicating the vendor ID of the video camera 100 in advance. The work area of the CPU 101 is not limited to the memory 102 but may be an external recording device such as a hard disk device.

  The communication unit 103 has an HDMI terminal for connecting the HDMI cable 400, and acquires the EDID of the television 200 via the HDMI cable 400. Further, the communication unit 103 transmits video data, audio data, auxiliary data, and the like to the television 200 via the HDMI cable 400. The communication unit 103 transmits and receives CEC commands via the HDMI cable 400.

  The communication unit 103 includes a data processing unit 103a, an EDID acquisition unit 103b, and a command processing unit 103c.

  The data processing unit 103a can transmit video data, audio data, and auxiliary data to the television 200 via the TMDS line 401.

  The CPU 101 generates video data corresponding to the display capability of the television 200, audio data corresponding to the audio capability of the television 200, and auxiliary data according to the EDID of the television 200 acquired by the EDID acquisition unit 103b, and a data processing unit 103a. The video data, audio data, auxiliary data, and the like supplied to the data processing unit 103a are controlled by the CPU 101 so as to be transmitted to the television 200 via the TMDS line 401.

  The EDID acquisition unit 103b requests the EDID from the television 200, and acquires the EDID of the television 200 from the television 200 via the DDC line 402. The EDID acquired by the EDID acquisition unit 103b is supplied to the CPU 101 and analyzed by the CPU 101. The EDID of the television 200 analyzed by the CPU 101 is recorded in the memory 102.

  The command processing unit 103 c can receive the CEC command transmitted from the television 200 via the CEC line 403. The CEC command received from the television 200 is supplied from the command processing unit 103c to the CPU 101, and the CPU 101 controls the video camera 100 according to the CEC command received by the command processing unit 103c from the television 200.

  In addition, the command processing unit 103 c transmits a CEC command for controlling the television 200 to the television 200 via the CEC line 403. A CEC command for controlling the television 200 is generated by the CPU 101 and supplied from the CPU 101 to the command processing unit 103c.

  When the command processing unit 103 c transmits a CEC command to the television 200 via the CEC line 403, the television 200 transmits a response signal to the CEC command to the video camera 100 when receiving the CEC command from the video camera 100. The response signal includes an Ack (Acknowledge) signal indicating a positive response and a Nack (Negative Acknowledge) signal indicating a negative response. When the television 200 can correctly receive the CEC command transmitted from the video camera 100, it returns an Ack signal to the video camera 100. When the television 200 cannot correctly receive the CEC command transmitted from the video camera 100, it returns a Nack signal to the video camera 100. The command processing unit 103 c can receive the Ack signal or the Nack signal via the CEC line 403.

  The display unit 104 includes a display device such as a liquid crystal display. When the operation mode of the video camera 100 is the shooting mode, the display unit 104 displays the video data generated by the imaging unit 106. When the operation mode of the video camera 100 is the playback mode, the display unit 104 displays the video data read from the recording medium 108 by the recording unit 107.

  The operation unit 105 provides a user interface for operating the video camera 100. The operation unit 105 has a plurality of buttons for operating the video camera 100. Each button included in the operation unit 105 includes a switch, a touch panel, and the like. The CPU 101 can control the video camera 100 in accordance with a user instruction input via the operation unit 105.

  The operation unit 105 includes a power button, a mode change button, a start / stop button, a menu button, a + button, a − button, a SET button, and the like.

  When the operation mode of the video camera 100 is the shooting mode, the imaging unit 106 captures a subject and generates video data from the optical image of the subject. The video data generated by the imaging unit 106 may be either a moving image or a still image. The video data generated by the imaging unit 106 is supplied from the imaging unit 106 to the data processing unit 103a, the display unit 104, and the recording unit 107. When the EDID of the television 200 can be received from the television 200, the imaging unit 106 converts the video data supplied from the imaging unit 106 to the data processing unit 103a into video data suitable for the display capability of the television 200. The video data supplied from the imaging unit 106 to the data processing unit 103a is transmitted to the television 200 via the TMDS line 401. The video data supplied from the imaging unit 106 to the recording unit 107 is recorded on the recording medium 108. The video data supplied from the imaging unit 106 to the display unit 104 is displayed on the display unit 104.

  When the imaging unit 106 generates video data, a microphone unit (not shown) generates audio data. Audio data generated by the microphone unit is supplied from the microphone unit to the data processing unit 103a, the recording unit 107, and a speaker unit (not shown). The microphone unit can generate audio data corresponding to 5.1 channels (hereinafter referred to as “5.1 ch”) and audio data corresponding to two channels (hereinafter referred to as “2 ch”).

  When the EDID of the television 200 can be received from the television 200, the microphone unit converts the audio data supplied from the microphone unit to the data processing unit 103a into audio data suitable for the audio capability of the television 200. The audio data supplied from the microphone unit to the data processing unit 103a is transmitted to the television 200 via the TMDS line 401. The audio data supplied from the microphone unit to the recording unit 107 is recorded on the recording medium 108. Audio data supplied from the microphone unit to the display unit 104 is output from a speaker unit (not shown).

  When the operation mode of the video camera 100 is the playback mode, the imaging unit 106 stops shooting the subject and stops generating video data from the optical image of the subject.

  When the operation mode of the video camera 100 is the shooting mode, the recording unit 107 records the video data generated by the imaging unit 106 and the audio data generated by a microphone unit (not shown) on the recording medium 108. Recording of video data and audio data generated by the imaging unit 106 and the microphone unit onto the recording medium 108 is controlled by the CPU 101 in accordance with a user instruction input via the operation unit 105. The CPU 101 can also control recording of video data and audio data generated by the imaging unit 106 and the microphone unit on the recording medium 108 in accordance with the CEC command received from the television 200.

  The recording unit 107 can reproduce the video data and audio data selected by the user from the recording medium 108 when the operation mode of the video camera 100 is the reproduction mode. Video data and audio data reproduced from the recording medium 108 are selected by the CPU 101 in accordance with a user instruction input via the operation unit 105. The CPU 101 may select the video data and audio data reproduced from the recording medium 108 according to the CEC command received from the television 200.

  Video data reproduced by the recording unit 107 from the recording medium 108 is supplied from the recording unit 107 to the data processing unit 103 a and the display unit 104. When the EDID of the television 200 can be received from the television 200, the CPU 101 converts the video data supplied from the recording unit 107 to the data processing unit 103a into video data suitable for the display capability of the television 200. The video data supplied from the recording unit 107 to the data processing unit 103 a is transmitted to the television 200 via the TMDS line 401. The video data supplied from the recording unit 107 to the display unit 104 is displayed on the display unit 104. The audio data reproduced from the recording medium 108 by the recording unit 107 is supplied from the recording unit 107 to the data processing unit 103a and a speaker unit (not shown). When the EDID of the television 200 can be received from the television 200, the CPU 101 converts the audio data supplied from the recording unit 107 to the data processing unit 103a into audio data suitable for the audio capability of the television 200. The audio data supplied from the recording unit 107 to the data processing unit 103a is transmitted to the television 200 via the TMDS line 401. The audio data supplied from the recording unit 107 to the speaker unit is output from the speaker unit.

  When the operation mode of the video camera 100 is the shooting mode, the recording unit 107 records video data supplied from the imaging unit 106 and audio data supplied from a microphone unit (not shown) on the recording medium 108.

  The recording medium 108 is a recording medium such as a memory card or a hard disk device. The recording medium 108 may be built in the video camera 100 or removable from the video camera 100.

<TV 200>
Next, an example of the configuration of the television 200 will be described with reference to FIG.

  As illustrated in FIG. 1, the television 200 includes a CPU 201, a first communication unit 202, a second communication unit 203, a display unit 204, an audio output unit 205, and a data processing unit 206.

  The CPU 201 controls the television 200 according to a computer program stored in a memory (not shown).

  The first communication unit 202 has an HDMI terminal for connecting the HDMI cable 400. The first communication unit 202 can receive video data, audio data, and auxiliary data transmitted from the video camera 100 via the TMDS line 401. Video data received from the video camera 100 is displayed on the display unit 204. Audio data received from the video camera 100 is output from the audio output unit 205. The auxiliary data received from the video camera 100 is supplied to the CPU 201. The CPU 201 can control the television 200 according to the auxiliary data received from the video camera 100.

  The first communication unit 202 can receive the CEC command transmitted from the video camera 100 via the CEC line 403. The CEC command received from the video camera 100 is supplied from the first communication unit 202 to the CPU 201. The CPU 201 can control the television 200 according to the CEC command received from the video camera 100. The first communication unit 202 can also transmit a CEC command for controlling the video camera 100 to the video camera 100 via the CEC line 403. A CEC command for controlling the video camera 100 is generated by the CPU 201 and supplied from the CPU 201 to the first communication unit 202.

  Further, the first communication unit 202 can transmit the EDID of the television 200 stored in a memory (not shown) to the video camera 100 via the DDC line 402.

  Note that a vendor ID of the television 200 is stored in a memory (not shown) in addition to the EDID.

  The second communication unit 203 has an HDMI terminal for connecting the HDMI cable 500. The second communication unit 203 can receive the video data, audio data, and auxiliary data transmitted from the amplifier 300 via the TMDS line 501. The video data received from the amplifier 300 is displayed on the display unit 204. The audio data received from the amplifier 300 is output from the audio output unit 205. The auxiliary data received from the amplifier 300 is supplied to the CPU 201. The CPU 201 can control the television 200 according to the auxiliary data received from the amplifier 300.

  The second communication unit 203 can receive the CEC command transmitted from the amplifier 300 via the CEC line 503. The CEC command received from the amplifier 300 is supplied from the second communication unit 203 to the CPU 201. The CPU 201 can control the television 200 according to the CEC command received from the amplifier 300. The second communication unit 203 can also transmit a CEC command for controlling the amplifier 300 to the amplifier 300 via the CEC line 503. A CEC command for controlling the amplifier 300 is generated by the CPU 201 and supplied from the CPU 201 to the second communication unit 203.

  Further, the second communication unit 203 can transmit the EDID of the television 200 stored in a memory (not shown) to the amplifier 300 via the DDC line 502.

  Note that the number of HDMI terminals included in the television 200 is arbitrary depending on the television 200, and the television 200 can connect source devices and repeater devices other than the video camera 100 and the amplifier 300 via the HDMI cable as many as the number of HDMI terminals. .

  The display unit 204 includes a display device such as a liquid crystal display. The display unit 204 displays video data supplied from at least one of a tuner unit (not shown), the first communication unit 202, and the second communication unit 203. When the video data received by the first communication unit 202 and the second communication unit 203 is supplied to the display unit 204, the display unit 204 receives the video data received from any one of the video camera 100 and the amplifier 300. Is displayed.

  The audio output unit 205 outputs audio data supplied from at least one of a tuner unit (not shown), the first communication unit 202, and the second communication unit 203. When the audio data received from the first communication unit 202 and the second communication unit 203 is supplied to the audio output unit 205, the audio output unit 205 receives from either the video camera 100 or the amplifier 300. Audio data is output. Note that the audio output unit 205 includes a speaker or the like. Note that the audio output unit 205 can output at least one of audio data compatible with 2ch and audio data compatible with 5.1ch.

  The data processing unit 206 has a terminal for connecting the optical cable 600, and converts audio data supplied from at least one of a tuner unit (not shown), the first communication unit 202, and the second communication unit 203 into audio. The signal is output to the amplifier 300 via the line 601. When the audio data received by the first communication unit 202 and the second communication unit 203 is supplied, the data processing unit 206 converts the audio data received from any one of the video camera 100 and the amplifier 300 into audio. The signal is output to the amplifier 300 via the line 601.

  The CPU 201 can set the audio data received from the video camera 100 by the first communication unit 202 to be output by any one of the audio output unit 205 and the amplifier 300.

<Amplifier 300>
Next, an example of the configuration of the amplifier 300 will be described with reference to FIG.

  As illustrated in FIG. 1, the amplifier 300 includes a CPU 301, a communication unit 302, an audio output unit 303, and a data processing unit 304.

  The CPU 301 controls the amplifier 300 according to a computer program stored in a memory (not shown). The CPU 201 can control the amplifier 300 according to the CEC command received from the television 200.

  Note that a vendor ID of the amplifier 300 is stored in a memory (not shown).

  The communication unit 302 has an HDMI terminal for connecting the HDMI cable 500, and acquires the EDID of the television 200 via the HDMI cable 500. Further, the communication unit 302 transmits video data, audio data, auxiliary data, and the like to the television 200 via the HDMI cable 500. The communication unit 302 transmits and receives CEC commands via the HDMI cable 500.

  The audio output unit 303 outputs the audio data supplied from the data processing unit 304. Note that the audio output unit 303 includes a speaker or the like. Note that the audio output unit 303 can output at least one of audio data compatible with 2ch and audio data compatible with 5.1ch.

  The data processing unit 304 has a terminal for connecting the optical cable 600, and can receive audio data from the television 200 via the optical cable 600. The data processing unit 304 supplies the received audio data to the audio output unit 303.

<Selection process>
Next, with reference to FIG. 2, the selection process performed in the video camera 100 according to the first embodiment will be described. FIG. 2 is a flowchart for explaining an example of the selection process performed by the video camera 100 according to the first embodiment. The selection process is a process performed by the CPU 101 when the HDMI terminal of the video camera 100 and the HDMI terminal of the television 200 are connected via the HDMI cable 400. The computer program for causing the video camera 100 to execute the selection process of FIG. 2 may be a computer program recorded in the memory 102. The computer program for causing the video camera 100 to execute the selection process of FIG. 2 may be a computer program based on an OS (Operating System) running on the computer.

  In the selection process, the video camera 100 selects an output destination of audio data reproduced by the video camera 100 according to information indicating the audio output capability of the television 200 and information indicating the audio output capability of the amplifier 300. It is processing.

  When the HDMI terminal of the video camera 100 and the HDMI terminal of the TV 200 are connected via the HDMI cable 400, the CPU 101 controls the EDID acquisition unit 103b so as to acquire the EDID of the TV 200 from the TV 200 in S201. . In this case, when the EDID acquisition unit 103b requests the EDID from the television 200 and receives an Ack signal corresponding thereto, the EDID acquisition unit 103b acquires the EDID of the television 200 from the television 200 via the DDC line 402. The EDID of the television 200 acquired by the EDID acquisition unit 103b is analyzed by the CPU 101, and the EDID analysis result is recorded in the memory 102. When the request for acquiring the EDID is made to the television 200 by the EDID acquiring unit 103b, the process proceeds from S201 to S202. When the EDID acquisition unit 103b requests the TV 200 for an EDID, the EDID acquisition unit 103b cannot acquire the EDID of the TV 200 from the TV 200 if the Ack signal corresponding to the EDID request cannot be received. In this case, this flowchart ends.

  In step S <b> 202, the CPU 101 determines whether the audio output capability of the television 200 is compatible with 5.1 ch, using the EDID analysis result recorded in the memory 102. Note that the CPU 101 detects the audio output capability of the television 200 by referring to the Short Audio Descriptor defined in the EDID. When the CPU 101 determines that the audio output capability of the television 200 is compatible with 5.1ch (YES in S202), the process proceeds from S202 to S203. If the CPU 101 determines that the audio output capability of the television 200 does not support 5.1ch (NO in S202), the process proceeds from S202 to S204. If the CPU 101 determines that the audio output capability of the television 200 does not support 5.1ch (NO in S202), the CPU 101 determines that the audio output capability of the television 200 corresponds to 2ch. .

  In step S <b> 203, the CPU 101 sets a 5.1 ch flag indicating that it corresponds to 5.1 ch in the memory 102 to ON. The 5.1ch flag is information indicating whether or not a device capable of outputting audio data corresponding to 5.1ch exists in the communication system according to the first embodiment. When the 5.1ch flag in the memory 102 is on, the CPU 101 determines that at least one of the audio output capability of the television 200 and the audio output capability of the amplifier 300 corresponds to 5.1ch. When the 5.1ch flag in the memory 102 is not on, the CPU 101 determines that at least one of the audio output capability of the television 200 and the audio output capability of the amplifier 300 does not support 5.1ch. When the 5.1ch flag in the memory 102 is turned on, this flowchart ends.

  If the CPU 101 determines that the audio output capability of the television 200 does not support 5.1ch (NO in S202), an apparatus that can output audio data reproduced from the video camera 100 in addition to the television 200. Determine if it exists. In the case of the first embodiment, the CPU 101 determines whether or not the amplifier 300 is connected to the television 200.

  In step S <b> 204, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for determining whether or not the amplifier 300 is connected to the television 200 to the amplifier 300 via the television 200. The CEC command for determining whether or not the amplifier 300 is connected to the television 200 is a <Polling Message> command including the logical address “5”. The <Polling Message> command is one of CEC commands defined in the CEC protocol.

  The logical address “5” is a logical address corresponding to “Audio System”. The device corresponding to the logical address “5” is a device having a voice output capability. Therefore, the CPU 101 transmits a <Polling Message> command including the logical address “5”, and determines whether the amplifier 300 is connected to the television 200 based on a response to the command. Note that the <Polling Message> command including the logical address “5” is generated by the CPU 101.

  When the <Polling Message> command including the logical address “5” is transmitted via the CEC line 403 by the command processing unit 103c, the process proceeds from S204 to S205. Note that the CEC command for determining whether or not the amplifier 300 is connected to the television 200 may be a command other than the <Polling Message> command including the logical address “5”, or may be a vendor command. Be good.

  In step S205, the CPU 101 determines whether the command processing unit 103c has received an Ack signal for the <Polling Message> command including the logical address “5” transmitted in step S204.

  When the CPU 101 determines that the command processing unit 103c has received the Ack signal, the CPU 101 determines that the television 200 and the amplifier 300 are connected. If the CPU 101 determines that the command processing unit 103c has received an Ack signal (YES in S205), the process proceeds from S205 to S206.

  When the CPU 101 determines that the command processing unit 103c has not received the Ack signal, the CPU 101 determines that the television 200 and the amplifier 300 are not connected. When the CPU 101 determines that the command processing unit 103c has not received the Ack signal (NO in S205), the follow chart ends.

  When the TV 200 and the amplifier 300 are connected (YES in S205), the CPU 101 selects whether to output the audio data reproduced by the video camera 100 to the TV 200 or the amplifier 300. The sound output capability of the amplifier 300 is detected. For this purpose, the CPU 101 detects the audio output capability of the amplifier 300 by acquiring the Short Audio Descriptor of the amplifier 300 from the amplifier 300.

  The following two methods can be cited as a method for acquiring the Short Audio Descriptor of the amplifier 300. One is a first method for acquiring the Short Audio Descriptor of the amplifier 300 using a vendor command of the CEC protocol. The second method is a second method for acquiring the Short Audio Descriptor of the amplifier 300 using the CEC command defined in the CEC protocol.

  The CPU 101 selects whether to use the first method or the second method depending on whether or not the amplifier 300 is compatible with the 1.4 version of the CEC protocol of the HDMI standard.

  In step S <b> 206, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for detecting the version of the CEC protocol corresponding to the amplifier 300 to the amplifier 300 via the television 200. Note that the CEC command for detecting the version of the CEC protocol corresponding to the amplifier 300 is a <Get CEC Version> command.

  When the amplifier 300 receives a <Get CEC Version> command transmitted from the video camera 100, the amplifier 300 transmits a <CEC Version> command to the video camera 100. The <CEC Version> command transmitted from the amplifier 300 to the video camera 100 is a response command to the <Get CEC Version> command. Note that the <CEC Version> command transmitted from the amplifier 300 includes information indicating the version of the CEC protocol corresponding to the amplifier 300.

  When the command processing unit 103c receives a <CEC Version> command from the amplifier 300, the command processing unit 103c supplies the received <CEC Version> command to the CPU 101. The CPU 101 stores information indicating the version of the CEC protocol corresponding to the amplifier 300 in the memory 102 from the <CEC Version> command supplied from the command processing unit 103 c. In this case, the flowchart proceeds from S206 to S207.

  In step S <b> 207, the CPU 101 determines whether the version of the CEC protocol corresponding to the amplifier 300 is 1.4 using information indicating the version of the CEC protocol corresponding to the amplifier 300 stored in the memory 102. If the CPU 101 determines that the version of the CEC protocol corresponding to the amplifier 300 is 1.4 (YES in S207), the process proceeds from S207 to S208. When the CPU 101 determines that the version of the CEC protocol corresponding to the amplifier 300 is not 1.4 (NO in S207), the flowchart proceeds from S207 to S210.

  When the version of the CEC protocol corresponding to the amplifier 300 is 1.4 (YES in S207), the CPU 101 acquires the Short Audio Descriptor of the amplifier 300 by the second method.

  Therefore, in S208, the CPU 101 controls the command processing unit 103c to transmit a CEC command for acquiring the audio output capability of the amplifier 300 to the amplifier 300 via the CEC line 403.

  Note that the CEC command for acquiring the audio output capability of the amplifier 300 is a command for acquiring the short audio descriptor of the amplifier 300 from the amplifier 300. The CEC command for acquiring the audio output capability of the amplifier 300 is, for example, a <Request Short Audio Descriptor> command defined by the CEC protocol corresponding to version 1.4. The <Request Short Audio Descriptor> command is a CEC command that is not defined by the CEC protocol corresponding to version 1.3 or version 1.2.

  The amplifier 300 that has received the <Request Short Audio Descriptor> command from the video camera 100 transmits a <Report Short Audio Descriptor> command to the video camera 100. The <Report Short Audio Descriptor> command transmitted from the amplifier 300 to the video camera 100 is a response command to the <Request Short Audio Descriptor> command. It should be noted that the <Report Short Audio Descriptor> command transmitted from the amplifier 300 includes the Short Audio Descriptor of the amplifier 300.

  The command processing unit 103 c that has received the <Report Short Audio Descriptor> command from the amplifier 300 supplies the received <Report Short Audio Descriptor> command to the CPU 101. The CPU 101 stores the Short Audio Descriptor of the amplifier 300 in the memory 102 from the <Report Short Audio Descriptor> command supplied from the command processing unit 103 c. In this case, in the flowchart, the process proceeds from S208 to S209.

  In step S <b> 209, the CPU 101 determines whether or not the amplifier 300 is compatible with 5.1 ch audio output using the Short Audio Descriptor of the amplifier 300 stored in the memory 102. When the CPU 101 determines that the audio output capability of the amplifier 300 is compatible with 5.1ch (YES in S209), the process proceeds from S209 to S203. When the CPU 101 determines that the audio output capability of the amplifier 300 does not support 5.1ch (NO in S209), this flowchart ends.

  When the version of the CEC protocol corresponding to the amplifier 300 is not 1.4 (NO in S207), the CPU 101 obtains the Short Audio Descriptor of the amplifier 300 by the first method. When the video camera 100 controls the amplifier 300 using a vendor command of the CEC protocol, the vendor ID of the video camera 100 and the vendor ID of the amplifier 300 need to match. This is because, when the vendor ID of the video camera 100 and the vendor ID of the amplifier 300 do not match, even if the video camera 100 transmits a vendor command to the amplifier 300, the amplifier 300 operates in accordance with the vendor command from the video camera 100. It is because it does not perform.

  Therefore, the CPU 101 confirms whether or not the vendor ID of the video camera 100 and the vendor ID of the amplifier 300 match before transmitting a vendor command for acquiring the Short Audio Descriptor of the amplifier 300 to the amplifier 300. Note that a vendor command for acquiring the Short Audio Descriptor of the amplifier 300 is hereinafter referred to as “predetermined vendor command”. For this reason, in S210, the CPU 101 controls the command processing unit 103c to transmit a CEC command for obtaining the vendor ID of the amplifier 300 to the amplifier 300 via the CEC line 403. The CEC command for acquiring the vendor ID of the amplifier 300 is a <Give Device Vendor ID> command.

  When the amplifier 300 receives a <Give Device Vendor ID> command from the video camera 100, the amplifier 300 transmits a <Device Vendor ID> command to the video camera 100. The <Device Vendor ID> command transmitted from the amplifier 300 to the video camera 100 is a response command to the <Give Device Vendor ID> command. Note that the <Device Vendor ID> command transmitted from the amplifier 300 includes information indicating the vendor ID of the amplifier 300.

  When the command processing unit 103c receives a <Device Vendor ID> command from the amplifier 300, the command processing unit 103c supplies the received <Device Vendor ID> command to the CPU 101. The CPU 101 stores the vendor ID of the amplifier 300 in the memory 102 from the <Device Vendor ID> command supplied from the command processing unit 103c. In this case, the flowchart proceeds from S210 to S211.

  In step S <b> 211, the CPU 101 determines whether or not the vendor ID of the amplifier 300 acquired in step S <b> 210 matches the vendor ID of the video camera 100 stored in the memory 102 in advance. If the CPU 101 determines that the vendor ID of the amplifier 300 and the vendor ID of the video camera 100 match (YES in S211), the process proceeds from S211 to S212.

  If the CPU 101 determines that the vendor ID of the amplifier 300 and the vendor ID of the video camera 100 do not match (NO in S211), this flowchart ends.

  In S212, the CPU 101 controls the command processing unit 103c to transmit a predetermined vendor command to the amplifier 300 via the CEC line 403.

  When the amplifier 300 receives a predetermined vendor command from the video camera 100, the amplifier 300 transmits a vendor command for a response corresponding to the predetermined vendor command to the video camera 100. Note that the vendor command for the response includes the Short Audio Descriptor of the amplifier 300. The vendor command for response is hereinafter referred to as “response command”.

  When the command processing unit 103c receives a response command from the amplifier 300, the command processing unit 103c supplies the received response command to the CPU 101. The CPU 101 stores the short audio descriptor of the amplifier 300 in the memory 102 from the response command supplied from the command processing unit 103 c. In this case, in the flowchart, the process proceeds from S212 to S209.

  If the process of turning on the 5.1ch flag in the memory 103 in S203 is not performed, the video camera 100 transmits audio data corresponding to 2ch to at least one of the television 200 and the amplifier 300. To do. Therefore, when the television 200 and the amplifier 300 are not connected (NO in S205), the video camera 100 does not transmit audio data corresponding to 5.1ch to the television 200.

  If it is determined that the vendor ID of the amplifier 300 and the vendor ID of the video camera 100 do not match (NO in S211), the video camera 100 cannot detect the audio output capability of the amplifier 300. For this reason, the video camera 100 does not transmit audio data corresponding to 5.1ch to at least one of the television 200 and the amplifier 300 until it is determined that the audio output capability of the amplifier 300 is compatible with 5.1ch. To.

  If the audio output capability of the amplifier 300 does not support 5.1 ch (NO in S209), the video camera 100 does not transmit audio data corresponding to 5.1 ch to at least one of the television 200 and the amplifier 300. Like that.

  In S204, the CPU 101 controls the command processing unit 103c to transmit a CEC command for determining whether or not the amplifier 300 is connected to the television 200 to the amplifier 300 via the television 200. . However, the CEC command for determining whether or not the amplifier 300 is connected to the television 200 may be a command other than the <Polling Message> command including the logical address “5”.

  In S204 and S205, the CPU 101 determines whether or not the amplifier 300 is connected to the television 200 by a method other than transmitting a CEC command for determining whether or not the amplifier 300 is connected to the television 200. It shall be good.

  In S206, the CPU 101 controls the command processing unit 103c to transmit a CEC command for detecting the version of the CEC protocol corresponding to the amplifier 300 to the amplifier 300 via the television 200. However, the CEC command for detecting the version of the CEC protocol corresponding to the amplifier 300 may be a command other than the <Get CEC Version> command.

  In S206 and S207, the CPU 101 determines whether the version of the CEC protocol corresponding to the amplifier 300 is 1.4 by a method other than transmitting a CEC command for detecting the version of the CEC protocol corresponding to the amplifier 300. You may judge.

  In S207, the CPU 101 determines whether the version of the CEC protocol corresponding to the amplifier 300 is 1.4. However, in step S <b> 207, the CPU 101 may determine whether the command processing unit 103 c can transmit a <Request Short Audio Descriptor> command to the amplifier 300. In this case, when the CPU 101 determines that the command processing unit 103c can transmit the <Request Short Audio Descriptor> command to the amplifier 300 (YES in S207), the CPU 101 performs the process of S208. If the CPU 101 determines that the command processing unit 103c cannot transmit the <Request Short Audio Descriptor> command to the amplifier 300 (NO in S207), the CPU 101 performs the process of S210.

  In step S210, the CPU 101 controls the command processing unit 103c to transmit a CEC command for acquiring the vendor ID of the amplifier 300 to the amplifier 300 via the CEC line 403. However, the CEC command for acquiring the vendor ID of the amplifier 300 may be a command other than the <Give Device Vendor ID> command. In S210, the CPU 101 may acquire the vendor ID from the amplifier 300 by a method other than transmitting a CEC command for acquiring the vendor ID of the amplifier 300.

<Audio output processing>
Next, an audio output process performed by the video camera 100 according to the first embodiment will be described with reference to FIG. FIG. 3 is a flowchart for explaining an example of an audio output process performed by the video camera 100 according to the first embodiment. The audio output process is a process for controlling the video camera 100 when the HDMI terminal of the video camera 100 and the HDMI terminal of the television 200 are connected by the HDMI cable 400. Further, the computer program for causing the video camera 100 to execute the audio output processing shown in FIG. 3 may be realized using an OS (Operating System) running on the computer. good. Note that the audio output process in FIG. 3 is performed by the CPU 101 after the selection process in FIG. 2 is performed.

  The audio output process is a process performed by the CPU 101 when the HDMI terminal of the video camera 100 and the HDMI terminal of the television 200 are connected via the HDMI cable 400. Further, the computer program for causing the video camera 100 to execute the audio output processing of FIG. 3 is a computer program recorded on the memory 102, or an OS running on the computer. Also good.

  The audio output process is a process for controlling whether the video camera 100 outputs audio data corresponding to 2ch or 5.1ch.

  The audio output process is a process performed when the operation mode of the video camera 100 is the playback mode.

  In step S <b> 301, the CPU 101 determines whether an instruction to reproduce audio data is input via the operation unit 105. If it is determined by the CPU 101 that an instruction to reproduce audio data has been input via the operation unit 105 (YES in S301), the process proceeds from S301 to S302. When it is determined by the CPU 101 that an instruction to reproduce audio data has not been input via the operation unit 105 (NO in S301), this flowchart ends.

  In S302, the CPU 101 determines whether or not the 5.1ch flag in the memory 102 is set to ON. If the CPU 101 determines that the 5.1ch flag in the memory 102 is on (YES in S302), the process proceeds from S302 to S303. If the CPU 101 determines that the 5.1ch flag in the memory 102 is not on (NO in S302), the process proceeds from S302 to S304.

  In S303, the CPU 101 reads out the audio data corresponding to 5.1ch from the recording medium 108, and transmits the audio data corresponding to the read 5.1ch to the television 200 via the TMDS line 401. To control. In this case, this flowchart ends. In step S303, the CPU 101 may control the data processing unit 103a so as to generate audio data corresponding to 5.1ch and transmit the generated audio data corresponding to 5.1ch to the television 200. In this case, when the audio output unit 205 can output audio data corresponding to 5.1ch, the television 200 outputs the audio data corresponding to 5.1ch transmitted from the video camera 100 to the audio output unit 205 in S303. I will let you. In this case, when the audio output unit 205 cannot output the audio data corresponding to 5.1ch, the television 200 converts the audio data corresponding to 5.1ch transmitted from the video camera 100 in step S303 to the audio of the amplifier 300. The output unit 303 outputs the data. Therefore, the CPU 201 supplies the audio data corresponding to 5.1ch received from the video camera 100 by the first communication unit 202 to the data processing unit 206 and transmits the data to the amplifier 300 via the optical cable 600. The unit 206 is controlled.

  In S304, the CPU 101 reads out the audio data corresponding to 2ch from the recording medium 108, and transmits the audio data corresponding to 2ch read out from the recording medium 108 via the TMDS line 401 to the television 200. To control. In this case, this flowchart ends. In step S305, the CPU 101 may control the data processing unit 103a so as to generate audio data corresponding to 2ch and transmit the generated audio data corresponding to 2ch to the television 200. In this case, the television 200 causes the audio output unit 205 to output audio data corresponding to 2ch transmitted from the video camera 100 in S304.

  As described above, the video camera 100 according to the first embodiment transmits the audio data corresponding to 5.1ch to the television 200 when the television 200 can output the audio data corresponding to 5.1ch. Thus, the user can view the audio data corresponding to 5.1ch reproduced from the video camera 100 on the television 200 that can output the audio data corresponding to 5.1ch. In addition, even when the television 200 cannot output audio data corresponding to 5.1 ch, the video camera 100 can output 5.1 audio when the amplifier 300 can output audio data corresponding to 5.1 ch. The corresponding audio data is transmitted to the television 200.

  Thus, the user can view the audio data corresponding to 5.1ch reproduced from the video camera 100 with the amplifier 300 that can output the audio data corresponding to 5.1ch.

  In addition, when the TV 200 and the amplifier 300 cannot output audio data corresponding to 5.1ch, the video camera 100 transmits audio data corresponding to 2CH to the TV 200. Thereby, the user can view the audio data corresponding to 2ch reproduced from the video camera 100 on the television 200.

  In S303, the CPU 101 controls the data processing unit 103b to transmit audio data corresponding to 5.1ch to the television 200. However, the CPU 101 may control the data processing unit 103b to transmit the video data together with the audio data corresponding to 5.1ch to the television 200.

  In step S304, the CPU 101 controls the data processing unit 103b to transmit audio data corresponding to 2ch to the television 200. However, the CPU 101 may control the data processing unit 103b to transmit video data to the television 200 together with audio data corresponding to 2ch.

[Example 2]
Next, the video camera 100 according to the second embodiment will be described with reference to FIG. In the second embodiment, the description of the parts common to the first embodiment will be omitted, and the parts different from the first embodiment will be described.

  The HDMI cable 500 connected between the amplifier 300 and the television 200 according to the second embodiment includes a HEAC (HDMI Ethernet (registered trademark) and Audio Return Channel) line 504. The HEAC line 504 is a transmission line for transmitting audio data from the television 200 to the amplifier 300.

  The second communication unit 203 of the television 200 according to the second embodiment can transmit at least one of audio data corresponding to 2ch and audio data corresponding to 5.1ch to the amplifier 300 via the HEAC line 504. .

  The communication unit 302 of the amplifier 300 according to the second embodiment can receive at least one of audio data corresponding to 2ch and audio data corresponding to 5.1ch to the television 200 via the HEAC line 504. Audio data received from the television 200 by the communication unit 302 via the HEAC line 504 is output by the audio output unit 303.

<Selection process>
Next, with reference to FIG. 5, the selection process performed by the video camera 100 according to the second embodiment will be described. FIG. 5 is a flowchart for explaining an example of the selection process performed by the video camera 100 according to the second embodiment. The selection process is a process performed by the CPU 101 when the HDMI terminal of the video camera 100 and the HDMI terminal of the television 200 are connected via the HDMI cable 400. The computer program for causing the video camera 100 to execute the selection process of FIG. 5 may be a computer program recorded in the memory 102 or a computer program based on an OS running on the computer. good.

  Since S501, S502, and S504 to S512 in the selection process in FIG. 5 are processes common to S201, S202, and S204 to S212 in the selection process in FIG.

  If the CPU 101 determines that the audio output capability of the television 200 is compatible with 5.1ch (YES in S502), the process proceeds from S502 to S503.

  In S503, the CPU 101 sets the first flag in the memory 102 to ON. The first flag is information indicating that the audio output capability of the television 200 corresponds to 5.1ch. When the first flag in the memory 102 is on, the CPU 101 determines that the audio output capability of the television 200 corresponds to 5.1ch. If the first flag in the memory 102 is not on, the CPU 101 determines that the audio output capability of the television 200 does not support 5.1ch. When the first flag in the memory 102 is turned on, this flowchart ends.

  If the CPU 101 determines that the audio output capability of the amplifier 300 is compatible with 5.1ch (YES in S509), the process proceeds from S509 to S513.

  In step S513, the CPU 101 sets the second flag in the memory 102 to ON. The second flag is information indicating that the audio output capability of the amplifier 300 corresponds to 5.1ch. When the second flag in the memory 102 is on, the CPU 101 determines that the audio output capability of the amplifier 300 corresponds to 5.1ch. If the second flag in the memory 102 is not on, the CPU 101 determines that the audio output capability of the amplifier 300 does not correspond to 5.1ch. When the second flag in the memory 102 is turned on, this flowchart ends.

<Audio output processing>
Next, an audio output process performed by the video camera 100 according to the second embodiment will be described with reference to FIG. FIG. 6 is a flowchart for explaining an example of an audio output process performed by the video camera 100 according to the second embodiment. The audio output process is a process performed by the CPU 101 when the HDMI terminal of the video camera 100 and the HDMI terminal of the television 200 are connected via the HDMI cable 400. 6 is performed by the CPU 101 after the selection process of FIG. 5 is performed. Further, the computer program for causing the video camera 100 to execute the audio output processing of FIG. 6 is a computer program recorded by the OS running on the computer, even if it is a computer program recorded in the memory 102. Also good.

  Since S301 in the audio output process in FIG. 3 is a process common to S601 in the audio output process in FIG. 6, the description thereof will be omitted.

  If the CPU 101 determines that an instruction to reproduce audio data has been input via the operation unit 105 (YES in S601), the process proceeds from S601 to S602.

  In step S602, the CPU 101 determines whether the first flag in the memory 102 is set to ON. If the CPU 101 determines that the first flag in the memory 102 is on (YES in S602), the process proceeds from S602 to S603. When the CPU 101 determines that the first flag in the memory 102 is not on (NO in S602), the process proceeds from S602 to S604.

  In step S <b> 603, the CPU 101 reads the audio data corresponding to 5.1 ch from the recording medium 108, and then transmits the read audio data corresponding to 5.1 ch to the television 200 via the TMDS line 401. 103a is controlled. In this case, this flowchart ends. In step S602, the CPU 101 may control the data processing unit 103a so as to generate audio data corresponding to 5.1ch and transmit the generated audio data corresponding to 5.1ch to the television 200.

  In step S604, the CPU 101 determines whether the second flag in the memory 102 is set to ON. When the CPU 101 determines that the second flag in the memory 102 is on (YES in S604), the process proceeds from S604 to S605. If the CPU 101 determines that the second flag in the memory 102 is not on (NO in S604), the process proceeds from S604 to S613.

  In step S <b> 605, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for determining whether or not the television 200 supports the CEC protocol to the television 200. The CEC command for determining whether or not the television 200 is compatible with the CEC protocol is a <Polling Message> command including the logical address “0”.

  The logical address “0” is a logical address corresponding to “TV”. A device corresponding to the logical address “0” is a sink device in HDMI. Therefore, the CPU 101 transmits a <Polling Message> command including the logical address “0”, and determines whether the television 200 is compatible with the CEC protocol based on a response to the command. Note that the <Polling Message> command including the logical address “0” is generated by the CPU 101.

  When the <Polling Message> command including the logical address “0” is transmitted by the command processing unit 103c via the CEC line 403, the process proceeds from S605 to S606. Note that the CEC command for determining whether or not the television 200 is compatible with the CEC protocol may be a command other than the <Polling Message> command including the logical address “0”.

  In step S606, the CPU 101 determines whether the command processing unit 103c has received an Ack signal for the <Polling Message> command including the logical address “0” transmitted in step S605.

  When the CPU 101 determines that the command processing unit 103c has received the Ack signal, the CPU 101 determines that the television 200 is compatible with the CEC protocol. If the CPU 101 determines that the command processing unit 103c has received the Ack signal (YES in step S606), the process proceeds from step S606 to step S607.

  When the CPU 101 determines that the command processing unit 103c has not received the Ack signal, the CPU 101 determines that the television 200 does not support the CEC protocol. If the CPU 101 determines that the command processing unit 103c has not received the Ack signal (NO in S606), the follow chart proceeds from S606 to S613.

  In step S <b> 607, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for acquiring the vendor ID of the television 200 to the television 200 via the CEC line 403. The CEC command for acquiring the vendor ID of the television 200 is a <Give Device Vendor ID> command.

  When the television 200 receives a <Give Device Vendor ID> command from the video camera 100, the television 200 transmits a <Device Vendor ID> command to the video camera 100. The <Device Vendor ID> command transmitted from the television 200 to the video camera 100 is a response command to the <Give Device Vendor ID> command. The <Device Vendor ID> command includes information indicating the vendor ID of the television 200.

  When the command processing unit 103c receives a <Device Vendor ID> command from the television 200, the command processing unit 103c supplies the received <Device Vendor ID> command to the CPU 101. The CPU 101 stores the vendor ID of the television 200 in the memory 102 from the <Device Vendor ID> command supplied from the command processing unit 103c. In this case, in the flowchart, the process proceeds from S607 to S608.

  In step S <b> 608, the CPU 101 determines whether the vendor ID of the television 200 acquired in step S <b> 607 matches the vendor ID of the video camera 100 stored in the memory 102 in advance. If the CPU 101 determines that the vendor ID of the television 200 and the vendor ID of the video camera 100 match (YES in S608), the process proceeds from S608 to S609. If the CPU 101 determines that the vendor ID of the television 200 and the vendor ID of the video camera 100 do not match (NO in S608), the process proceeds from S608 to S613.

  In step S <b> 609, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for detecting the version of the CEC protocol corresponding to the television 200 to the television 200. Note that the CEC command for detecting the version of the CEC protocol corresponding to the television 200 is a <Get CEC Version> command.

  When the TV 200 receives the <Get CEC Version> command transmitted from the video camera 100, the TV 200 transmits the <CEC Version> command to the video camera 100. The <CEC Version> command transmitted from the television 200 to the video camera 100 is a response command to the <Get CEC Version> command. Note that the <CEC Version> command transmitted from the television 200 includes information indicating the version of the CEC protocol corresponding to the television 200.

  When the command processing unit 103c receives the <CEC Version> command from the television 200, the command processing unit 103c supplies the received <CEC Version> command to the CPU 101. The CPU 101 stores in the memory 102 information indicating the version of the CEC protocol corresponding to the television 200 from the <CEC Version> command supplied from the command processing unit 103c. In this case, in the flowchart, the process proceeds from S609 to S610.

  In step S <b> 610, the CPU 101 determines whether the version of the CEC protocol corresponding to the television 200 is 1.4 using information indicating the version of the CEC protocol corresponding to the television 200 stored in the memory 102. When the CPU 101 determines that the version of the CEC protocol corresponding to the television 200 is 1.4 (YES in S610), the process proceeds from S610 to S611. When the CPU 101 determines that the version of the CEC protocol corresponding to the television 200 is not 1.4 (NO in S610), the flowchart proceeds from S610 to S612.

  In step S <b> 611, the CPU 101 transmits a CEC command to the television 200 to instruct the audio data transmitted from the video camera 100 to the television 200 to be transmitted to the amplifier 300 via the HEAC line 504. To control.

  Note that the CEC command for instructing audio data transmitted from the video camera 100 to the television 200 to be transmitted to the amplifier 300 via the HEAC line 504 is a vendor command of the CEC protocol. The TV 200 that has received a CEC command for instructing the audio data transmitted from the video camera 100 to the TV 200 to be transmitted to the amplifier 300 via the HEAC line 504 receives the audio data from the video camera 100 as an audio output unit. No output by 205. In this case, the television 200 controls the second communication unit 203 so that the audio data transmitted from the video camera 100 to the television 200 is transmitted to the amplifier 300 via the HEAC line 504. In this case, the amplifier 300 causes the audio output unit 303 to output the audio data received from the television 200 via the HEAC line 504. In this case, in the flowchart, the process proceeds from S611 to S603.

  In step S <b> 612, the CPU 101 transmits a CEC command for instructing the audio data transmitted from the video camera 100 to the television 200 to be transmitted to the amplifier 300 via the audio line 601. To control.

  Note that the CEC command for instructing audio data transmitted from the video camera 100 to the television 200 to be transmitted to the amplifier 300 via the optical cable 600 is a CEC protocol vendor command. Receiving the CEC command for instructing the audio data transmitted from the video camera 100 to the television 200 to be transmitted to the amplifier 300 via the optical cable 600, the television 200 receives the audio data from the video camera 100 as the audio output unit 205. Will not output. In this case, the television 200 controls the data processing unit 206 so that the audio data transmitted from the video camera 100 to the television 200 is transmitted to the amplifier 300 via the audio line 601. In this case, the amplifier 300 causes the audio output unit 303 to output the audio data received from the television 200 via the audio line 601. In this case, the flowchart proceeds from S612 to S603.

  In S613, the data processing unit 103a reads the audio data corresponding to 2ch from the recording medium 108, and transmits the audio data corresponding to 2ch read from the recording medium 108 via the TMDS line 401 to the television 200. To control. In this case, this flowchart ends. In step S613, the CPU 101 may control the data processing unit 103a so as to generate audio data corresponding to 2ch and transmit the generated audio data corresponding to 2ch to the television 200. At this time, the CPU 101 may transmit a command for instructing the audio output unit 205 of the television 200 to output audio data corresponding to 2ch transmitted from the video camera 100. Note that when the processing of S613 is performed, audio data corresponding to 2ch reproduced by the video camera 100 is output by the audio output unit 205.

  When S603 is performed by the CPU 101 without performing S611 and S612, the CPU 101 issues a command for causing the audio output unit 205 to output audio data corresponding to 5.1ch from the video camera 100. 200 may be transmitted.

  When S603 is performed by the CPU 101 in a state where S611 is performed, the television 200 transmits audio data corresponding to 5.1ch transmitted from the video camera 100 to the amplifier 300 via the HEAC line 504. To.

  When S603 is performed by the CPU 101 in a state where S612 is performed, the television 200 transmits audio data corresponding to 5.1ch transmitted from the video camera 100 to the amplifier 300 via the optical cable 600. To do.

  As described above, the video camera 100 according to the second embodiment can obtain the same effects at portions common to the first embodiment.

  In the video camera 100 according to the second embodiment, when the television 200 can output audio data corresponding to 5.1 ch, the TV 200 outputs audio data corresponding to 5.1 ch. Thereby, the video camera 100 can control the television 200 so that the audio data corresponding to 5.1ch reproduced from the video camera 100 is output by the television 200 capable of outputting the audio data corresponding to 5.1ch. .

  Further, the video camera 100 outputs audio data corresponding to 5.1ch even when the amplifier 300 can output audio data corresponding to 5.1ch even when the television 200 cannot output audio data corresponding to 5.1ch. Was made to be performed by the amplifier 300. Thus, the video camera 100 can control the television 200 so that the audio data corresponding to 5.1ch reproduced from the video camera 100 is output by the amplifier 300 that can output the audio data corresponding to 5.1ch. .

  In step S <b> 605, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for determining whether or not the television 200 supports the CEC protocol to the television 200. However, the CEC command for determining whether or not the television 200 is compatible with the CEC protocol may be a command other than the <Polling Message> command including the logical address “0”.

  In step S603, the CPU 101 controls the data processing unit 103a to transmit audio data corresponding to 5.1ch. However, the CPU 101 may control the data processing unit 103a to transmit video data together with audio data corresponding to 5.1ch.

  Even when the process of S603 is performed after the process of any one of S611 and S612 is performed, the CPU 101 causes the display unit 204 of the television 200 to output the video data. In this case, audio data corresponding to 5.1ch reproduced from the video camera 100 is output from the audio output unit 303, and video data reproduced from the video camera 100 is output from the display unit 204.

  Note that when the process of S603 is performed in a state where the processes of S611 and S612 are not performed, the CPU 101 causes the display unit 204 of the television 200 to output the video data. In this case, audio data corresponding to 5.1ch reproduced from the video camera 100 is output from the audio output unit 205, and video data reproduced from the video camera 100 is output from the display unit 204.

  In steps S605 and S606, the CPU 101 determines whether the television 200 is compatible with the CEC protocol by a method other than transmitting a CEC command for determining whether the television 200 is compatible with the CEC protocol. It shall be good.

  In step S <b> 607, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for acquiring the vendor ID of the television 00 to the television 200 via the CEC line 403. However, the CEC command for acquiring the vendor ID of the television 200 may be a command other than the <Give Device Vendor ID> command. In step S <b> 607, the CPU 101 may acquire the vendor ID from the amplifier 300 by a method other than transmitting a CEC command for acquiring the vendor ID of the television 200. For example, when the vendor ID of the television 200 can be obtained from the EDID of the television 200, if the Ack signal is received in S606 (YES in S606), the CPU 101 performs the process of S608 without performing the process of S607. It may be acceptable.

  In step S <b> 609, the CPU 101 controls the command processing unit 103 c to transmit a CEC command for detecting the version of the CEC protocol corresponding to the television 200 to the television 200. However, the CEC command for detecting the version of the CEC protocol corresponding to the television 200 may be a command other than the <Get CEC Version> command.

  In S609 and S610, the CPU 101 determines whether or not the version of the CEC protocol corresponding to the television 200 is 1.4 by a method other than transmitting a CEC command for detecting the version of the CEC protocol corresponding to the television 200. You may judge.

  In S610, the CPU 101 determines whether the version of the CEC protocol corresponding to the television 200 is 1.4. However, in S610, the CPU 101 may determine whether or not the television 200 can transmit audio data to the amplifier 300 via the HEAC line 504. In this case, when the CPU 101 determines that the television 200 can transmit audio data to the amplifier 300 via the HEAC line 504 (YES in S610), the CPU 101 performs the process of S611. When the CPU 101 determines that the television 200 cannot transmit audio data to the amplifier 300 via the HEAC line 504 (NO in S610), the CPU 101 performs the process of S612.

  In step S613, the CPU 101 controls the data processing unit 103a to transmit audio data corresponding to 2ch. However, the CPU 101 may control the data processing unit 103a that transmits video data together with audio data corresponding to 2ch. In this case, audio data corresponding to 2ch reproduced from the video camera 100 is output from the audio output unit 205, and video data reproduced from the video camera 100 is output from the display unit 204.

  Transmission for transmitting any one of the first audio data corresponding to the first channel and the second audio data corresponding to the second channel different from the first channel to the first audio output device. Means, first detection means for detecting whether or not the first audio output device corresponds to the first channel, and the first audio output device and the second audio output device are connected. If the second audio output device corresponds to the first channel, at least one of the second detection means, the first detection means, and the second detection means is provided. And a control means for controlling the transmission means.

[Other embodiments]
The communication apparatus according to the present invention is not limited to the communication apparatus 100 described in the first and second embodiments, and may be realized by a system including a plurality of apparatuses, for example.

  The processing performed by the communication device described in the first and second embodiments and the function of the communication device can also be realized by a computer program. In this case, the computer program according to the present invention can be executed by a computer (including a CPU and the like), and realizes various functions described in the first and second embodiments.

  It goes without saying that the computer program according to the present invention may realize various processes and functions described in the first and second embodiments using an OS (Operating System) running on the computer.

  The computer program according to the present invention is read from a computer-readable recording medium and executed by the computer. As the computer-readable recording medium, a hard disk device, an optical disk, a CD-ROM, a CD-R, a memory card, a ROM, or the like can be used. The computer program according to the present invention may be provided from an external device to a computer via a communication interface and executed by the computer.

Claims (8)

Transmission for transmitting any one of the first audio data corresponding to the first channel and the second audio data corresponding to the second channel different from the first channel to the first audio output device. Means,
First detection means for detecting whether or not the first audio output device corresponds to the first channel;
A second detection means for detecting whether or not the second audio output device corresponds to the first channel when the first audio output device and the second audio output device are connected;
And a control unit that controls the transmission unit using at least one of the first detection unit and the second detection unit.   The said control means makes the said 1st audio | voice output apparatus output the said 1st audio | voice data, when the said 1st audio | voice output apparatus respond | corresponds to the said 1st channel. The communication apparatus according to 1.   When the first audio output device does not correspond to the first channel and the second audio output device corresponds to the first channel, the control means includes the first audio output device. The communication apparatus according to claim 1, wherein the first audio data is output to the second audio output apparatus.   When the first audio output device and the second audio output device do not correspond to the first channel, the control unit causes the first audio output device to output the second audio data. The communication apparatus according to claim 1, wherein the communication apparatus is configured as described above.   5. The transmission unit according to claim 1, wherein the transmission unit transmits any one of the first audio data and the second audio data to the first audio output device using TMDS. The communication apparatus of any one of Claims.   6. The communication apparatus according to claim 1, wherein the first channel is 5.1 channel, and the second channel is 2 channel.   2. The transmission means transmits one of the first audio data and the second audio data to the first audio output device via an interface corresponding to HDMI. 7. The communication device according to any one of 1 to 6.   When the first audio output device does not correspond to the first channel and the second audio output device corresponds to the first channel, the control means transmits the transmission 8. The communication apparatus according to claim 1, wherein video data transmitted by the means is output to the first audio output apparatus. 9.

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