JP2011160137A - Communication equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To execute no power off command according to a state of a source device even when the source device receives the power off command from a sink device. <P>SOLUTION: Communication equipment (100) which receives a command based on the CEC standard of the HDMI standard from a first external device (200), includes: a controller (101) for changing, when the power off command for instructing change of the communication equipment to a second state with lower power consumption than that of a first state is received from the first external device, the communication equipment from the first state to the second state after predetermined time passes when the communication equipment is at the first state; a transmitter (103a) for transmitting video data to the second external device (400); and a first determiner (101) for determining whether or not the transmitter is at a communicable state, and when the transmitter is at the communicable state, the controller does not change the communication equipment from the first state to the second state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication device that communicates with an external device.

  Currently, a communication interface called High-Definition Multimedia Interface (HDMI) (registered trademark) has been proposed. A communication system compliant with the HDMI standard (hereinafter referred to as “HDMI system”) includes a source device and a sink device. The source device can transmit the video data via the HDMI interface. The sink device can receive the video data from the source device via the HDMI interface and display the received video data.

  In the HDMI system, a command compliant with the CEC (Consumer Electronics Control) standard (hereinafter referred to as “CEC command”) can be used. The source device can control the sink device by using the CEC command. The sink device can also control the source device by using the CEC command.

  When the sink device has not been operated for a certain period of time, the sink device turns off the power of its own device and sends a CEC command (system standby command) for turning off the main power of the source device to the source device. (Patent Document 1).

JP 2009-260727 A

  The conventional source device controls the entire source device so as to turn off the main power of the source device when a system standby command is received from the sink device.

  However, when the source device receives a system standby command from the sink device, even when authentication of communication between the source device and an external device other than the sink device is completed, the source device automatically responds to the system standby command. The main power of the machine was turned off.

  In this case, since the communication between the source device and the external device is disconnected, when the video data is transmitted from the source device to the external device, the source device needs to authenticate the communication between the source device and the external device again. .

  Further, when communication between the source device and the external device is disconnected, the video data to be transmitted to the external device generated in the source device is also deleted. In this case, when the user disconnects the communication between the source device and the external device, the video data to be transmitted to the external device generated in the source device is also deleted. In this case, after the user completes authentication of communication between the source device and the external device, the source device needs to generate video data to be transmitted to the external device again.

  For this reason, the convenience of the source device has been reduced for the user.

  Therefore, an object of the present invention is to improve the convenience of the source device by not executing the power off command according to the state of the source device even if the source device receives the power off command from the sink device. With the goal.

The present invention provides a communication device that receives a command conforming to the CEC standard included in the HDMI standard from a first external device, and the communication device is placed in the first state when the communication device is in the first state. When a power-off command for instructing to change to the second state with lower power consumption is received from the first external device, the communication device is moved to the first state after a predetermined time has elapsed. Control means for changing from a state to the second state;
A transmission unit that transmits video data corresponding to the second external device to a second external device, and whether or not the transmission unit is in a communicable state in which the video data can be transmitted to the second external device. When the first determination unit that determines and the transmission unit are in the communicable state, the control unit discards the power-off command so that the communication device is moved from the first state to the second state. It is characterized by not changing to a state.

  According to the present invention, even if the source device receives a power-off command from the sink device, the convenience of the source device is improved by not executing the power-off command according to the state of the source device.

1 is a system diagram of a communication system (HDMI system) according to Embodiments 1 and 2 of the present invention. It is a block diagram which shows an example of a structure of the communication apparatus 100, the 1st external apparatus 200, and the 2nd external apparatus 400 which concern on Example 1 and 2 of this invention. It is a flowchart which shows the live view imaging | photography process performed with the communication apparatus 100 which concerns on Example 1 and 2 of this invention. It is a flowchart which shows the system standby process performed with the 1st external device 200 which concerns on Example 1 and 2 of this invention. It is a flowchart which shows the power-off process performed with the communication apparatus 100 which concerns on Example 1 of this invention. It is a flowchart which shows the power-off process performed with the communication apparatus 100 which concerns on Example 2 of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram according to an embodiment of the present invention.

[Example 1]
FIG. 1 is a diagram illustrating an example of a communication system (HDMI system) according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating an example of the configuration of the communication device 100, the first external device 200, and the second external device 400 according to the first embodiment of the invention.

  As illustrated in FIGS. 1 and 2, the communication system according to the first embodiment includes a communication device 100, a first external device 200, and a connection cable 300, and the communication device 100 and the external device 200 include a connection cable 300. Connected through. The communication system according to the first embodiment includes a communication device 100, a second external device 400, and a connection cable 500, as illustrated in FIGS. 1 and 2, and includes the communication device 100, the second external device 400, and the like. Are connected via a connection cable 500.

  In the first embodiment, the communication device 100, the first external device 200, and the connection cable 300 are assumed to conform to the HDMI standard. Accordingly, the communication apparatus 100 functions as a source in the HDMI standard, the first external apparatus 200 functions as a sink in the HDMI standard, and the connection cable 300 functions as an HDMI cable in the HDMI standard. . Note that the HDMI standard in Embodiments 1 and 2 is not limited to Version 1.3a, but may be Version 1.4a or later.

  In the first embodiment, the communication device 100, the second external device 400, and the connection cable 500 are assumed to conform to the USB (Universal Serial Bus) standard. Therefore, the communication apparatus 100 functions as a “device” in the USB standard, the second external apparatus 400 functions as a “host” in the USB standard, and the connection cable 500 functions as a USB cable in the USB standard. To do. Note that the USB standard in the first embodiment is not limited to Version 2.0, and may be Version 3.0 or later.

  In the first embodiment, the communication device 100 and the first external device 200 are compliant with the CEC (Consumer Electronics Control) standard defined by the HDMI standard. A command transmitted bidirectionally between the communication device 100 and the first external device 200 conforms to the CEC standard. Hereinafter, a command conforming to the CEC standard is referred to as a “CEC command”.

  In the first embodiment, a single-lens reflex camera (hereinafter referred to as a camera) is used as an example of the communication device 100. The communication device 100 may be any video output device that can transmit video data, audio data, and auxiliary data to the first external device 200 via the connection cable 300. The communication device 100 may be any video output device that can transmit video data and auxiliary data to the second external device 400 via the connection cable 500.

  In the first embodiment, a television receiver (hereinafter referred to as “TV”) is used as an example of the first external device 200. Note that the first external device 200 is a display device that displays video data received from the communication device 100 on a display and outputs audio data received from the communication device 100 from a speaker. It may be a device.

  In the first embodiment, a printer is used as an example of the second external device 400. The second external device 400 may be a personal computer or a hard disk as long as it can receive video data from the communication device 100.

  Hereinafter, the communication device 100 is referred to as “camera 100”, the first external device 200 is referred to as “television 200”, and the second external device 400 is referred to as “printer 400”. Hereinafter, the connection cable 300 is referred to as “HDMI cable 300”, and the connection cable 500 is referred to as “USB cable 500”.

<HDMI cable 300>
Next, the HDMI cable 300 will be described with reference to FIG.

  The HDMI cable 300 includes a + 5V power line, an HPD (Hot Plug Detect) line, and a DDC (Display Data Channel) line. The HDMI cable 300 further includes a TMDS (Transition Minimized Differential Signaling) line 301 and a CEC line 302.

  The TMDS line 301 is a transmission line for transmitting video data, audio data, and auxiliary data from the camera 100 to the television 200. The TMDS line 301 includes a TMDS channel 0, a TMDS channel 1, a TMDS channel 2, and a TMDS clock channel.

  The CEC line 302 is a transmission line for bidirectionally transmitting various CEC commands between the camera 100 and the television 200. The television 200 can transmit a CEC command for controlling the camera 100 to the camera 100 via the CEC line 302. The camera 100 can transmit a CEC command for controlling the television 200 to the television 200 via the CEC line 302.

<USB cable 500>
The USB cable 500 includes a pair of differential data lines 501 and a power supply line.

  In the data line 501, a protocol for controlling the camera 100 connected to the printer 400 is prepared. With this protocol, video data and audio data can be transmitted bidirectionally between the USB printer 400 and the camera 100. Further, the printer 400 can control the camera 100 by a control command transmitted from the printer 400 to the camera 100 between the USB printer 400 and the camera 100 by this protocol.

  The power supply line is a line for supplying power from the printer 400 to the camera 100 as necessary.

  Note that the connection cable 300 is not limited to a USB cable. A connection cable other than a USB cable may be used as long as the connection cable has a line for transmitting image data, audio data, and auxiliary data. Further, although the USB cable is used as the connection cable 300 for performing communication between the printer 400 and the camera 100, the communication between the camera 100 and the printer 400 may be performed by wireless communication. In addition to the USB cable, communication may be performed using an interface conforming to the IEEE 1394 standard.

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

  2, the camera 100 includes a CPU (Central Processing Unit) 101, a memory 102, a communication unit 103, an imaging unit 104, an image processing unit 105, a recording unit 106, a display unit 107, an operation unit 108, and a power supply unit. 109.

  The CPU 101 controls the operation of the entire camera 100 according to a computer program stored in the memory 102. The CPU 101 can know the image display capability and audio processing capability of the television 200 by analyzing the device information of the television 200 acquired from the television 200. The device information of the television 200 is EDID (Extended display identification data) or E-EDID (Enhanced EDID) of the television 200. Each of EDID and E-EDID includes identification information of the television 200, 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 camera 100 that has received the EDID of the television 200 can automatically know the image display capability, audio processing capability, and the like of the television 200 by analyzing the EDID of the television 200. Furthermore, the camera 100 can generate video data and audio data suitable for the image display capability and audio processing capability of the television 200.

  The CPU 101 has a timer (not shown), and can measure the measurement time K by controlling the timer (not shown).

  The memory 102 functions as a work area for the CPU 101. The memory 102 also stores the EDID of the television 200 acquired from the television 200, information about the camera 100, information about the printer 400 acquired from the printer 400, the result of analysis by the CPU 101, and the like.

  The memory 102 also stores connection state information indicating the connection state between the printer 400 and the camera 100, print setting information of the printer 400 regarding the print capability of the printer 400, and the like as information regarding the printer 400. Further, the memory 102 also stores device information of the printer 400 such as information indicating the product name of the printer 400, information indicating the manufacturer name of the printer 400, and information indicating the product type of the printer 400. The information regarding the printer 400 is acquired from the printer 400 when the camera 100 and the printer 400 authenticate communication according to the USB standard via the USB cable 500.

  The memory 102 also corresponds to a product name list corresponding to information indicating the product name of the printer 400, a manufacturer name list corresponding to information indicating the manufacturer name of the printer 400, and information indicating the product type of the printer 400. Product type list etc. are recorded. Therefore, the CPU 101 can collate the device information of the printer 400 acquired from the printer 400 with these lists. As a result of collating the device information of the printer 400 with these lists, the CPU 101 determines the product name, manufacturer name, and product type of the printer 400, and records them in the memory 102.

  In addition, a measurement time K measured by a timer (not shown) is also stored in the memory 102.

  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 drive.

  The communication unit 103 includes an HDMI terminal 103a, a USB terminal 103b, a data transmission unit 103c, a command processing unit 103d, and a data processing unit 103e.

  The HDMI terminal 103 a is a connection terminal (connector) for connecting the HDMI cable 300. The HDMI terminal 103 a transmits video data, audio data, and auxiliary data to the television 200 via the TMDS line 301. Further, the HDMI terminal 103 a receives the CEC command transmitted from the television 200 via the CEC line 302. The HDMI terminal 103 a transmits a CEC command generated by the CPU 101 for controlling the television 200 to the television 200 via the CEC line 302. Also, the HDMI terminal 103a requests the EDID of the television 200 from the television 200, and acquires the EDID of the television 200 from the television 200 via a DDC line (not shown).

  The USB terminal 103 b is a connection terminal (connector) for connecting the USB cable 500. The USB terminal 103 b transmits video data, audio data, a control command, and a response signal to the control command to the printer 400 via the data line 501. The USB terminal 103 b receives video data, audio data, a control command, and a response signal to the control command from the printer 400 via the data line 501. Note that the control command and the response signal to the control command are those defined in the USB standard.

  The data transmission unit 103c transmits video data suitable for the image display capability of the television 200, audio data suitable for the audio processing capability of the television 200, and auxiliary data to the television 200 via the HDMI terminal 103a and the TMDS line 301.

  When the operation mode of the camera 100 is the shooting mode, the data transmission unit 103c sends the video data generated by the imaging unit 104 and the audio data generated by the microphone unit (not shown) to the HDMI terminal 103a and the TMDS line 301. To the TV 200. In this case, the auxiliary data generated by the CPU 101 is also transmitted to the television 200 through the HDMI terminal 103a and the TMDS line 301 together with the video data and the audio data. When the operation mode of the camera 100 is the reproduction mode, the data transmission unit 103c transmits the video data and audio data reproduced by the recording unit 106 from the recording medium 106a to the television 200 via the HDMI terminal 103a and the TMDS line 301. In this case, the auxiliary data generated by the CPU 101 is also transmitted to the television 200 through the HDMI terminal 103a and the TMDS line 301 together with the video data and the audio data.

  The command processing unit 103 d receives the CEC command transmitted from the television 200 via the HDMI terminal 103 a and the CEC line 302. The CEC command received from the television 200 is supplied to the CPU 101 from the command processing unit 103d. The CPU 101 controls the camera 100 according to the CEC command received from the television 200.

  In addition, the command processing unit 103d transmits a CEC command for controlling the television 200 to the television 200 via the HDMI terminal 103a and the CEC line 302. 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 103d.

  When the camera 100 transmits a CEC command to the television 200 and the television 200 can receive the CEC command from the camera 100, the television 200 transmits a response signal to the CEC command to the camera 100. Therefore, the command processing unit 103d can receive a response signal for the CEC command from the television 200. Response signals for the CEC command include an ACK (Acknowledge) signal (acknowledgement signal) indicating a positive response and a NACK (Negative Acknowledge) signal (negative response signal) indicating a negative response.

  The data processing unit 103e can receive video data, a control command, and a response signal to the control command from the printer 400 via the USB terminal 103b and the data line 501.

  When the data processing unit 103 e receives video data from the printer 400 via the USB terminal 103 b and the data line 501, the data processing unit 103 e supplies the video data to the recording unit 106 and the display unit 107. When the data processing unit 103e receives audio data from the printer 400 via the USB terminal 103b and the data line 501, the data processing unit 103e supplies the audio data to the recording unit 106 and the speaker unit.

  When the data processing unit 103 e receives a control command from the printer 400 via the USB terminal 103 b and the data line 501, the data processing unit 103 e supplies the control command to the CPU 101. The CPU 101 supplied with the control command from the data processing unit 103e controls each unit of the camera 100 according to the control command. When the data processing unit 103e receives a response signal for the control command from the printer 400 via the USB terminal 103b and the data line 501, the data processing unit 103e supplies the CPU 101 with a response signal for the control command.

  Further, the data processing unit 103e can transmit video data, audio data, a control command, and a response signal to the control command to the printer 400 via the USB terminal 103b and the data line 501.

  Note that the video data that the data processing unit 103e transmits to the printer 400 via the USB terminal 103b and the data line 501 is video data suitable for the printing capability of the printer 400.

  The imaging unit 104 has a connection terminal that can be connected to a lens unit (not shown). The lens unit includes a photographing lens group such as a variator lens and a focusing lens, a diaphragm, and a drive circuit thereof. The imaging unit 104 includes a focal plane shutter, an imaging element 104a, a mirror unit 104b, an A / D conversion unit, a timing generation circuit, a finder 104c, and the like.

  The image sensor 104 a converts an optical image of a subject incident through a lens unit (not shown) connected to a connection terminal of the image capturing unit 104 into an image signal that is an electrical signal. As an example of the image sensor, there is a CCD image sensor or a CMOS sensor, for example. The mirror means 104b moves to a position for guiding the optical image of the subject incident through the lens unit to the image sensor 104a or a position for guiding the optical image of the subject incident through the lens unit to the viewfinder 104c. The position where the optical image of the subject is guided to the image sensor 104a is a position where the mirror unit 104b is retracted from the optical image of the subject. The position where the optical image of the subject is guided to the viewfinder 104c is a position where the mirror means 104b reflects the optical image of the subject toward the viewfinder 104c in order to guide the optical image of the subject to the viewfinder 104c.

  The A / D conversion unit converts the image signal (analog data) output from the image sensor 104a into digital data (video data), and stores it in the memory 102, the communication unit 103, the image processing unit 105, the recording unit 106, and the display unit 107. Supply. The timing generation circuit supplies a clock signal and a control signal to each unit of the imaging unit 104. Further, when the operation mode of the camera 100 is the shooting mode, the imaging unit 104 captures a subject and generates video data from an optical image of the subject. When the operation mode of the camera 100 is the playback mode, the imaging unit 104 stops shooting the subject and stops generating video data from the optical image of the subject. Note that the video data generated by the imaging unit 104 may be still image data or moving image data.

  The image processing unit 105 performs image processing such as pixel interpolation processing and color conversion processing on the video data output from the imaging unit 104 or the video data read from the memory 102 or the recording medium 106a. The image processing unit 105 includes a compression / decompression circuit that compresses video data using a known compression method by adaptive discrete cosine transform (ADCT) or the like and decompresses the compressed video data. As a compression method for compressing video data, a JPEG method, an MPEG method, a RAW method, and the like can be given. The video data read from the memory 102 is subjected to compression processing or decompression processing in a compression / decompression circuit, and the image processing unit 105 stores the video data after the compression processing or decompression processing into the recording unit 106 or the communication unit. To 103.

  Further, the image processing unit 105 generates video data suitable for the image display capability of the television 200 from the video data supplied from the imaging unit 104 or the recording unit 106 in accordance with the EDID of the television 200 stored in the memory 102. To do. In this case, the image processing unit 105 supplies the generated video data suitable for the image display capability of the television 200 to the communication unit 103 or the recording unit 106.

  The image processing unit 105 also stores video data suitable for the printing capability of the printer 400 from the video data stored in the memory 102 or supplied from the imaging unit 104 or the recording unit 106 according to the print setting information of the printer 400. Is generated. In this case, the image processing unit 105 supplies the generated video data suitable for the printing capability of the printer 400 to the communication unit 103 or the recording unit 106.

  The imaging unit 104 and the image processing unit 105 are controlled by the CPU 101 to perform AF processing and AE processing. When the CPU 101 instructs to start AF processing and AE processing, the image processing unit 105 performs arithmetic processing using video data output from the imaging unit 104. The imaging unit 104 and the image processing unit 105 perform TTL (through-the-lens) AF processing and AE processing based on the calculation result.

  The imaging unit 104 and the image processing unit 105 are controlled by the CPU 101 so as to capture a still image. When the CPU 101 instructs to start still image shooting, the imaging unit 104 and the image processing unit 105 execute shooting processing including processing such as exposure processing and development processing. The analog data output from the image sensor 104a is converted into digital data via the A / D converter and written into the memory 102 as video data. The imaging unit 104 and the image processing unit 105 perform development processing and compression processing on the video data written in the memory 102. Video data that has undergone development processing and compression processing is written as still image data from the memory 102 to the recording medium 106a.

  When the operation mode of the camera 100 is the shooting mode, the recording unit 106 records the video data generated by the imaging unit 104 and the audio data generated by the microphone unit on the recording medium 106a. The recording unit 106 records the video data on which the image processing has been performed by the image processing unit 105 on the recording medium 106a. Recording of video data and audio data generated by the imaging unit 104 and the microphone unit onto the recording medium 106 a is controlled by the CPU 101 in accordance with a user instruction input via the operation unit 108. Similarly, the CPU 101 controls the recording of the video data subjected to the image processing by the image processing unit 105 on the recording medium 106 a in accordance with a user instruction input via the operation unit 108.

  When the operation mode of the camera 100 is the playback mode, the recording unit 106 plays back the video data and audio data selected by the user from the recording medium 106a. Selection of video data and audio data reproduced from the recording medium 106 a is controlled by the CPU 101 in accordance with a user instruction input via the operation unit 108.

  Video data reproduced from the recording medium 106 a by the recording unit 106 is supplied from the recording unit 106 to the communication unit 103 and the display unit 107. Video data supplied from the recording unit 106 to the communication unit 103 is transmitted to the television 200 or the printer 400. The video data supplied from the recording unit 106 to the display unit 107 is displayed on the display unit 107.

  The audio data reproduced by the recording unit 106 from the recording medium 106a is supplied from the recording unit 106 to the communication unit 103 and a speaker unit (not shown). The audio data supplied from the recording unit 106 to the communication unit 103 is transmitted to the television 200 or the printer 400. The audio data supplied from the recording unit 106 to the speaker unit is output from the speaker unit.

  The recording medium 106a is a recording medium such as a memory card or a hard disk drive. The recording medium 106 a may be a recording medium built in the camera 100 or a recording medium removable from the camera 100.

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

  The operation unit 108 provides a user interface for operating the camera 100. The operation unit 108 includes a power button 108a for operating the camera 100, a mode change button 108b, a shutter button 108c, a cross button, a menu button, and the like. Each button includes a switch, a touch panel, and the like. The CPU 101 can control the camera 100 in accordance with a user instruction input via the operation unit 108. When a button on the operation unit 108 is operated by the user, an operation signal corresponding to each button is input from the operation unit 108 to the CPU 101. The CPU 101 analyzes the operation signal input from the operation unit 108 and determines processing corresponding to the operation signal according to the analysis result. The CPU 101 controls each unit of the camera 100 so as to execute processing corresponding to the operation signal input from the operation unit 108.

  The power button 108a is a button for instructing the CPU 101 to turn the camera 100 on or off. When an operation signal is input from the power button 108a, the CPU 101 controls the power supply unit 109 to turn the camera 100 on or off. Note that the power-on state of the camera 100 is a state in which the power supply unit 109 supplies power to the entire camera 100. Hereinafter, the power-on state is referred to as a “first state”.

  The power off state in the camera 100 is a state in which the power supply unit 109 does not supply power to the entire camera 100. The power supply unit 109 that supplies power to the data processing unit 103e of the communication unit 103 is referred to as “first power supply unit”. The power supply unit 109 that supplies power to the recording unit 106 is referred to as “second power supply unit”. The power supply unit 109 that supplies power to the imaging unit 104 is referred to as “third power supply unit”.

  The mode change button 108b is a button for instructing the CPU 101 to change the operation mode of the camera 100 to one of the shooting mode, the playback mode, and the like. The shooting mode is a mode in which the image capturing unit 104 and the image processing unit 105 generate still image data. The shooting modes include a continuous shooting mode, an automatic shooting mode, a shutter speed priority shooting mode, an aperture priority shooting mode, a manual shooting mode, and the like.

  The shutter button 108c is a button having two states: a state S1 where the shutter button 108c is half-pressed and a state S2 where the shutter button 108c is fully pressed. When the operation mode of the camera 100 is the shooting mode, when the shutter button 108c is pressed and the state becomes S1, an operation signal for instructing AF processing and AE processing is input to the CPU 101 from the shutter button 108c. . In this case, the CPU 101 controls the imaging unit 104 and the image processing unit 105 to perform AF processing and AE processing.

  When the shutter button 108c is pressed to enter the state of S2, an operation signal for instructing shooting of a still image is input to the CPU 101 from the shutter button 108c. In this case, the CPU 101 controls the imaging unit 104 and the image processing unit 105 so as to generate a still image.

  The menu button is a button for instructing the CPU 101 to display or hide a menu screen for changing the settings of the camera 100 stored in the memory 102. By operating these menu screens, the user can perform live view shooting settings on the camera 100. The user can press the menu button to display a menu screen on the display unit 107, select an item for live view shooting using the cross button, and set to perform live view shooting.

  Note that when the setting of the live view shooting is set to “ON” by the user, the CPU 101 sets the live view shooting setting flag stored in the memory 102 indicating the presence / absence of the live view shooting to “ON”. When the setting for live view shooting is set to “OFF”, the CPU 101 sets the live view shooting setting flag in the memory 102 to “OFF”.

  The power supply unit 109 supplies necessary power to each unit of the camera 100 from an AC power source or a battery (not shown). The power supply unit 109 is controlled by the CPU 101 to change the camera 100 to any one of a power-on state, a power-off state, and a standby state. Note that the standby state in the camera 100 is a state in which the power supply unit 109 supplies power to a part of the camera 100 for power saving. Further, when the camera 100 is in a standby state, the power supply unit 109 is controlled by the CPU 101 so as to supply power to a part of the camera 100. Hereinafter, the standby state is referred to as a “second state”. The standby state (second state) is a state in which the power consumption of the entire camera 100 is lower than that in the power-on state (first state), and the power consumption of the entire camera 100 is higher than that in the power-off state. is there. Further, the CPU 101 can change the camera 100 to the power-on state earlier when the camera 100 is changed from the standby state to the power-on state than when the camera 100 is changed from the power-off state to the power-on state. it can. The standby state is a state in which the power supply unit 109 supplies power to the CPU 101, the memory 102, and the operation unit 108 of the camera 100, for example. When the camera 100 is in a standby state, the power supply unit 109 does not supply power to the communication unit 103, the imaging unit 104, the image processing unit 105, the recording unit 106, and the display unit 107. When the camera 100 is in the standby state, when any one of the power button 108a, the mode change button 108b, and the shutter button 108c is operated, the CPU 101 switches the power supply unit to change the camera 100 to the power on state. 109 is controlled.

  As a function of automatically changing the camera 100 from the power-on state to the standby state, there is a so-called “auto power-off” function. This auto power-off function automatically changes the camera 100 to a standby state for power saving when the set time T elapses when at least one of an operation signal, a CEC command, and a control command is not supplied to the CPU 101. It is.

  In the camera 100 in which the auto power-off function is valid, the CPU 101 supplies power so as to change the camera 100 from the power-on state to the standby state when the operation signal is not supplied from the operation unit 108 until the set time T elapses. The unit 109 is controlled. Further, in the camera 100 in which the auto power off function is effective, the CPU 101 automatically activates the camera 100 even when at least one of the CEC command and the control command is not supplied from the communication unit 103 until the set time T elapses. Change to standby mode. The set time T is a predetermined time that can be set by the user. In the camera 100 in which the auto power off function is valid, the CPU 101 automatically puts the camera 100 in the standby state when any one of the operation signal, the CEC command, and the control command is not supplied until the set time T elapses. Do not change to. When any one of the operation signal, the CEC command, and the control command is not supplied to the camera 100 in which the auto power off function is valid, the CPU 101 automatically puts the camera 100 into the standby mode when the set time T has not elapsed. Do not change to state.

  The “auto power off” function is set so that the user presses the menu button to display the menu screen on the display unit 107, selects the auto power off item with the cross button, and enables the auto power off function. can do. When the auto power off function is set to be valid, the user operates the cross button on the menu screen displayed on the display unit 107 to set the “auto power off” function setting time T. Can be set. For example, the user can set the set time T to any one time of 1 minute, 4 minutes, and 8 minutes. The set time T may be any time as long as it is longer than 0 minutes.

  When the auto power off setting is set to “ON”, the CPU 101 sets the auto power off flag indicating whether or not the auto power off is stored in the memory 102 to “ON” and is set by the user. Record the set time T. When the auto power off setting is set to “OFF”, the CPU 101 sets the auto power off flag in the memory 102 to “OFF”. When the auto power off flag is “ON”, the auto power off function is enabled, and when the auto power off flag is “OFF”, the auto power off function is disabled.

  The camera 100 may be a device such as a still camera, a recorder, or a hard disk drive.

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

  As illustrated in FIG. 2, the television 200 includes a CPU 201 (Central Processing Unit), a tuner unit 202, a communication unit 203, a display unit 204, an operation unit 205, a memory 206, a power supply unit 207, and a remote control signal reception unit 208. Furthermore, the television 200 has a remote controller 209.

  The CPU 201 controls the overall operation of the television 200 according to the computer program recorded in the memory 206. In addition, the CPU 201 generates a CEC command for controlling the camera 100 based on an operation signal from the operation unit 205. In addition, the CPU 201 generates a CEC command for controlling the camera 100 based on a remote control signal from the remote control signal receiving unit 208.

  The tuner unit 202 receives a television broadcast of the television channel selected by the user.

  The communication unit 203 includes an HDMI terminal 203 a that is a connection terminal for connecting the HDMI cable 300.

  The communication unit 203 receives video data, audio data, and auxiliary data transmitted from the camera 100 via the TMDS line 301 and the HDMI terminal 203a.

  The communication unit 203 receives the CEC command transmitted from the camera 100 via the CEC line 302 and the HDMI terminal 203a. In addition, a CEC command for controlling the camera 100 generated by the CPU 201 is transmitted to the camera 100 via the CEC line 302 and the HDMI terminal 203a.

  The communication unit 203 supplies the CEC command received from the camera 100 to the CPU 201. The CPU 201 controls the television 200 according to the CEC command received from the camera 100 supplied from the communication unit 203.

  In response to a request from the camera 100, the communication unit 203 transmits the EDID of the television 200 to the camera 100 via a DDC line (not shown) and the HDMI terminal 203a. It is assumed that the EDID of the television 200 is recorded in the memory 206.

  The display unit 204 includes a display device such as a liquid crystal display. When any one of the television broadcast received by the tuner unit 202 and the video data received by the communication unit 203 from the camera 100 is supplied, the display unit 204 displays the supplied video data.

  The operation unit 205 provides a user interface for operating the television 200. When the operation unit 205 is operated by the user, the operation unit 205 outputs an operation signal corresponding to the input user instruction to the CPU 201, and the CPU 201 controls the television 200 according to the operation signal. The operation unit 205 has a plurality of buttons for operating the television 200. Each button included in the operation unit 205 includes a switch, a touch panel, and the like. The operation unit 205 includes a power button 205a for operating the television 200, an external input button, and the like.

  The power button 205a is a button for instructing the CPU 201 to place the television 200 in a power-on state or a power-off state. When an operation signal is input from the power button 205a, the CPU 201 controls the power supply unit 207 to put the television 200 in a power-on state or a power-off state. Note that the power-on state of the television 200 is a state where necessary power is supplied from the power supply unit 207 to all of the televisions 200. In addition, the power-off state of the television 200 is a state where necessary power is not supplied from the power supply unit 207 to a part of the television 200. For example, the CPU 201, the memory 206, the communication unit 203, the operation unit 205, and the remote control signal reception unit 208 are in a state where necessary power is supplied from the power supply unit 207. In this case, when the television 200 is in a power-off state, necessary power is not supplied from the power supply unit 109 to the tuner unit 202 and the display unit 204.

  The power supply unit 207 supplies necessary power to each unit of the television 200 from an AC power source or the like.

  When receiving the remote control signal transmitted from the remote control 209, the remote control signal reception unit 208 supplies the received remote control signal to the CPU 201 as an operation signal. Thus, an instruction from the user is input to the CPU 201 as an operation signal via the remote controller 209 and the remote control signal receiving unit 208. The CPU 201 generates a CEC command corresponding to the operation signal from the remote control signal receiving unit 208 and supplies the generated CEC command to the communication unit 203.

  A remote control 209 (remote control) provides a user interface for operating the television 200. The remote controller 209 has a plurality of buttons for operating the television 200. Each button in the remote controller 209 includes a switch, a touch panel, and the like. The remote controller 209 has a power button 209a. The power button 209a transmits a power control remote control signal indicating that the television 200 is to be turned on or turned off to the remote control signal receiving unit 208. When receiving the power control remote control signal from the remote control 209, the remote control signal reception unit 208 inputs an operation signal indicating that the television 200 is to be turned on or turned off to the CPU 201. When an operation signal indicating that the television 200 is to be turned on or turned off is input from the remote control signal receiving unit 208, the CPU 201 supplies power to the television 200 to be turned on or turned off. The unit 207 is controlled.

  The remote controller 209 is configured to be able to communicate with the television 200 wirelessly but not to be able to communicate wirelessly with the camera 100 and the printer 400.

  Therefore, the user can directly remotely control the television 200 using the remote controller 209.

<Live view shooting process>
Next, a live view shooting process performed by the camera 100 according to the first and second embodiments will be described with reference to FIG.

  FIG. 3 is a flowchart for explaining an example of the live view shooting process performed by the camera 100 according to the first embodiment.

  The live view shooting process is performed when the camera 100 is in the shooting mode and the operation mode of the camera 100 is the shooting mode and the setting of the live view shooting is set to “ON”. Executed. In the first embodiment, a case where the CPU 101 controls live view shooting processing according to a computer program stored in the memory 102 will be described.

  In step S <b> 301, the CPU 101 determines whether the live view shooting setting flag stored in the memory 102 is set to “ON” or “OFF”. When the live view shooting setting flag in the memory 102 is set to “ON”, the CPU 101 determines that the live view function is valid. When the live view shooting setting flag is set to “OFF”, the CPU 101 determines that the live view function is invalid. If it is determined that the live view function is valid, the CPU 101 moves the mirror unit 104b from the position where the optical image of the subject is guided to the viewfinder 104c to the position where the image sensor 104a is guided (mirror up) in order to start live view shooting. ) To control. In this case, the CPU 101 controls the image capturing unit 104 and the image processing unit 105 to generate digital data from the subject light guided to the image sensor 104a. The digital data is subjected to predetermined pixel interpolation processing and color conversion processing by the image processing unit 105. Digital data that has undergone predetermined pixel interpolation processing and color conversion processing is stored in the memory 102 as video data. The imaging unit 104 and the image processing unit 105 generate video data from the optical image of the subject while the mirror unit 104b is in a position to guide the optical image of the subject to the imaging device 104a, and record the video data in the memory 102. Continue to execute the process. When the video data generated from the subject light is recorded in the memory 102 (YES in step S301), the flowchart proceeds from step S301 to step S302.

  When the CPU 101 determines that the live view function is invalid (NO in step S301), the flowchart returns from step S301 to step S301.

  In step S302, the CPU 101 determines whether or not an operation signal for instructing the AF process and the AE process is input when the shutter button 108c of the operation unit 108 is half-pressed (SW1 is pressed).

  If the CPU 101 determines that an operation signal for instructing AF processing and AE processing has been input (YES in step S302), the process proceeds from step S302 to step S303. If the CPU 101 determines that an operation signal for instructing AF processing and AE processing has not been input (NO in step S302), the process returns from step S302 to step S302.

  In step S303, the CPU 101 controls the imaging unit 104 and the image processing unit 105 to execute the AF process and the AE process. When the AF process and the AE process are executed by the imaging unit 104 and the image processing unit 105, the flowchart proceeds from step S303 to step S304. In step S303, the imaging unit 104 and the image processing unit 105 may perform an auto white balance process or the like in addition to the AF process and the AE process.

  In step S <b> 304, the CPU 101 determines whether or not an operation signal for instructing shooting of a still image is input when the shutter button 108 c of the operation unit 108 is fully pressed (SW <b> 2 is pressed). When the CPU 101 determines that an operation signal for instructing to capture a still image is input (YES in step S304), the process proceeds from step S304 to step S305. If the CPU 101 determines that an operation signal for instructing to capture a still image has not been input (NO in step S304), the process returns from step S304 to step S302.

  In step S305, the CPU 101 controls the imaging unit 104 and the image processing unit 105 so as to execute a photographing process. When the imaging process is executed by the imaging unit 104 and the image processing unit 105, the recording unit 106 creates a still image file including the captured still image data and records it on the recording medium 106a. When the photographed still image data is recorded from the memory 102 to the recording medium 106a, the process proceeds from step S305 to step S306.

  In step S <b> 306, the CPU 101 determines whether an operation signal for instructing the imaging unit 104 and the image processing unit 105 to interrupt live view shooting is input from the operation unit 108. Hereinafter, an operation signal for instructing the imaging unit 104 and the image processing unit 105 to interrupt the live view shooting is referred to as a “live view shooting stop signal”. When the camera 100 is performing live view shooting, the live view shooting stop signal is sent from the operation unit 108 to the CPU 101 when the power button 108a is operated to change the camera 100 from the power-on state to the power-off state. Entered. When the camera 100 is performing live view shooting, the live view shooting stop signal is displayed when the operation mode of the camera 100 is changed from the shooting mode to the playback mode by operating the mode change button 108b. To the CPU 101.

  In addition, when the camera 100 is performing live view shooting, the live view shooting stop signal is output from the operation unit 108 when the user changes the setting of live view shooting from “ON” to “OFF” on the menu screen. Input to the CPU 101.

  If the CPU 101 determines that a live view shooting stop signal has been input (YES in step S306), the CPU 101 controls the imaging unit 104 and the image processing unit 105 to interrupt the live view shooting. After controlling the imaging unit 104 and the image processing unit 105, the CPU 101 controls the mirror unit 104b to move (mirror down) from the position where the optical image of the subject is guided to the image sensor 104a to the position where it is guided to the finder 104c. In this case, the CPU 101 changes the live view shooting setting flag stored in the memory 102 from “ON” to “OFF”. When the live view setting flag stored in the memory 102 is changed to “OFF”, this flowchart ends. If the CPU 101 determines that the live view shooting stop signal has not been input (NO in step S306), the flowchart returns from step S306 to step S302.

<System standby processing>
Next, with reference to FIG. 4, the system standby process performed in the television 200 according to the first and second embodiments will be described.

  FIG. 4 is a flowchart for explaining an example of the system standby process performed in the television 200 according to the first and second embodiments.

  The system standby process in FIG. 4 is a process performed when the television 200 is operated from the power-on state to the power-off state by the user. Hereinafter, a case where the CPU 201 controls the system standby process according to the computer program stored in the memory 206 will be described.

  The system standby process in FIG. 4 is a process performed to realize a system standby defined in the CEC standard.

  System standby means that when an operation signal for turning the TV 200 from the power-on state to the power-off state is input to the TV 200 by the user, the device connected to the TV 200 via the HDMI cable is changed from the power-on state to the standby state. It is a function to make. The system standby is realized by the television 200 controlling the camera 100 using the CEC command. The <Standby> command is a CEC command for realizing System Standby. Hereinafter, the <Standby> command is referred to as a “power off command”.

  The power off command is a CEC command for changing the camera 100 connected to the television 200 via the HDMI cable 300 from the power on state to the standby state.

  In step S401, the CPU 201 determines whether or not the television 200 is in a power-on state. When the television 200 is in the power-on state (YES in step S401), the flowchart proceeds from step S401 to step S402. When the television 200 is not in the power-on state (NO in step S401), the flowchart returns from step S401 to step S401.

  In step S402, the CPU 201 determines whether a power-off signal is input. The power off signal is an operation signal for turning off the television 200 input to the CPU 201 from the power button 205a of the operation unit 205. Further, the power off signal may be a power control remote control signal for turning off the television 200 input to the CPU 201 from the power button 209a for controlling the television 200 of the remote controller 209 via the remote control signal receiving unit 208. Good. When a power-off signal is input from any one of the power button 205a of the operation unit 205 and the power button 209a of the remote controller 209 (YES in step S402), the process proceeds from step S402 to step S403. If no power-off signal is input from the power button 205a of the operation unit 205 and the power button 209a of the remote controller 209 (NO in step S402), this flowchart ends.

  In step S403, the CPU 201 generates a power off command. Further, the CPU 201 supplies the generated power-off command to the communication unit 203 and controls the communication unit 203 to transmit the power-off command to the camera 100 via the HDMI terminal 203a and the CEC line 302.

  When the communication unit 203 transmits a power-off command to the camera 100, the flowchart proceeds from step S403 to step S404.

  In step S404, the CPU 201 controls the power supply unit 207 to change the television 200 from the power-on state to the power-off state. When the television 200 is turned off, this flowchart ends.

  Note that the system standby processing in FIG. 4 may be performed when the CPU 201 automatically controls the television 200 to change from the power-on state to the power-off state in order to save power. For example, when the operation signal from the operation unit 205 or the operation signal from the remote control signal reception unit 208 is not input to the CPU 201 for a certain period in the television 200 in the power-on state, the CPU 201 performs steps S403 and S404. To be

<Power off process>
Next, with reference to FIG. 5, the power-off process performed by the camera 100 according to the first embodiment will be described. FIG. 5 is a flowchart for explaining an example of the power-off process performed by the camera 100 according to the first embodiment.

  The power-off process in FIG. 5 is a process performed when a power-off command is received from the television 200. In the first embodiment, a case where the CPU 101 controls the power-off process according to a computer program stored in the memory 102 will be described.

  In step S501, the CPU 101 generates a <Polling Message> command. The <Polling Message> command is a CEC command for confirming that the television 200 is compatible with the CEC standard. The CPU 101 outputs the generated <Polling Message> command to the command processing unit 103d. The CPU 101 controls the command processing unit 103 d to transmit a <Polling Message> command to the television 200 via the HDMI terminal 103 a and the CEC line 302. When the command processing unit 103d transmits a <Polling Message> command to the television 200, the flowchart proceeds from step S501 to step S502.

  In step S <b> 502, the CPU 101 determines whether the command processing unit 103 d has received an ACK signal for the <Polling Message> command from the television 200.

  When the command processing unit 103d does not receive the ACK signal (NO in step S502), the CPU 101 determines that the television 200 does not support the CEC standard. In this case (NO in step S502), this flowchart ends. Similarly, when the command processing unit 103d receives the NACK signal, the CPU 101 determines that the television 200 does not support the CEC standard, and thus this flowchart ends.

  When the command processing unit 103d receives the ACK signal (YES in step S502), the CPU 101 determines that the television 200 is compatible with the CEC standard. In this case (YES in step S502), the flowchart proceeds from step S502 to step S503. When it is determined that the television 200 is compliant with the CEC standard, the CPU 101 controls the command processing unit 103d to receive a CEC command from the television 200 via the HDMI terminal 103a and the CEC line 302.

  In step S503, the CPU 101 determines whether the command processing unit 103d has received a power-off command from the television 200. When the CPU 101 determines that the command processing unit 103d has not received the power-off command from the television 200 (NO in step S503), the flowchart ends. If the CPU 101 determines that the command processing unit 103d has received the power-off command from the television 200 (YES in step S503), the process proceeds from step S503 to step 504.

  In step S504, the CPU 101 determines whether or not the camera 100 is connected to the printer 400 via the USB terminal 103b and the USB cable 500.

  When the command processing unit 103d receives a power-off command from the television 200 (YES in step S503), the CPU 101 executes the power-off command and sets the power supply unit 109 so as to change the camera 100 from the power-on state to the standby state. Control. When the camera 100 is in a standby state, the power supply unit 109 stops supplying power to the communication unit 103, so the communication unit 103 disconnects communication with the printer 400 via the USB cable 500. . As a result, the camera 100 and the printer 400 cannot transmit data via the USB cable 500.

  Therefore, for example, when the camera 100 transmits video data suitable for the printing capability of the printer 400 to the printer 400, the printer 400 cannot receive the video data from the camera 100 when the camera 100 is changed to the standby state. There was a problem. Even if the camera 100 is changed from the standby state to the power-on state again, the camera 100 needs to authenticate communication for transmitting data to the printer 400 via the USB cable 500 by the communication unit 103. . Furthermore, the camera 100 again generates video data suitable for the printing capability of the printer 400 by the image processing unit 105 after authentication of communication for transmitting data via the USB cable 500 to the printer 400 is performed. There was a need. As a result, the convenience of the camera 100 has been reduced.

  In step S504, the CPU 101 determines whether the camera 100 is connected to the printer 400 via the USB terminal 103b and the USB cable 500, and executes a power-off command according to the determination result. Do not.

  The CPU 101 indicates whether or not the camera 100 is connected to the printer 400 via the USB terminal 103b and the USB cable 500, and indicates the connection state between the camera 100 and the printer 400 stored in the memory 102. Determined by connection status information. Note that the processing in step S504 is referred to as “first determination processing”.

  The connection state information is information indicating the device state (device state) of the camera 100 defined by the USB standard. Six device states of the camera 100 are defined by the USB standard, and information indicating the device state of one camera 100 out of the six device states is recorded in the connection state information. The six device states are defined by the USB standard as an “attached” state, a “powered” state, a “default” state, an “address” state, a “configured” state, and a “suspended” state. The “attached” state is a state in which the USB cable 500 is not attached to the camera 100. The “powered” state is a state in which the USB cable 500 is attached to the camera 100 but the power from the printer 400 is not supplied to the camera 100 via the USB cable. The “default” state is a state in which the camera 100 is not performing initialization processing when the power from the printer 400 is supplied to the camera 100 via the USB cable. The initialization process is a process for erasing device information and connection state information acquired by the camera 100 via the USB cable 500 before the communication authentication between the camera 100 and the printer 400 from the memory 102. . In the “address” state, a unique address is assigned from the printer 400 to the camera 100 when the power from the printer 400 is supplied to the camera 100 via the USB cable and the camera 100 performs initialization processing. There is no state.

  In the “configured” state, when the power from the printer 400 is supplied to the camera 100 via the USB cable and the camera 100 performs initialization processing, a unique address is assigned from the printer 400 to the camera 100. It is in a state. Furthermore, the “configured” state is a state in which authentication of communication between the camera 100 and the printer 400 for enabling the printer 400 to use the function of the camera 100 is completed. Therefore, when the camera 100 is in the “configured” state, the data processing unit 103 e can transmit video data to the printer 400 and can receive video data from the printer 400. When the camera 100 is in the “configured” state, the data processing unit 103 e can receive the control command transmitted from the printer 400 and can transmit the control command to the printer 400.

  The “suspended” state is a state in which authentication of communication between the camera 100 and the printer 400 is completed, but communication between the printer 400 and the camera 100 is temporarily stopped for power saving. In this case, the camera 100 stops communication with the printer 400 while holding the device information of the printer 400 and the connection status information with the printer 400 in the memory 102. Therefore, when the camera 100 is in the “suspended” state, the data processing unit 103 e cannot receive the video data and the control command from the printer 400. Further, when the camera 100 is in the “suspended” state, the data processing unit 103 e cannot transmit the video data and the control command to the printer 400. Hereinafter, the “configured” state is referred to as a “communication enabled state”.

  When the CPU 101 determines from the connection state information recorded in the memory 102 that the camera 100 is in a communicable state, the CPU 101 is connected to the printer 400 via the USB terminal 103b and the USB cable 500. It is determined that it is in a state.

  If the CPU 101 determines that the camera 100 is connected to the printer 400 via the USB terminal 103b and the USB cable 500 (YES in step S504), the process proceeds from step S504 to step S511.

  When the CPU 101 determines from the connection state information recorded in the memory 102 that the camera 100 is in a state other than the “configured” state, the CPU 101 determines that the camera 100 is not in a communicable state. When the CPU 101 determines that the camera 100 is not in a communicable state, the CPU 101 determines that the camera 100 is not connected to the printer 400 via the USB terminal 103b and the USB cable 500.

  If the CPU 101 determines that the camera 100 is not connected to the printer 400 via the USB terminal 103b and the USB cable 500 (NO in step S504), the process proceeds from step S504 to step S505.

  In step S505, the CPU 101 determines whether the recording unit 106 has written video data on the recording medium 106a.

  When the command processing unit 103d receives a power-off command from the television 200 (YES in step S503), the CPU 101 executes the power-off command and sets the power supply unit 109 so as to change the camera 100 from the power-on state to the standby state. Control. When the recording unit 106 is writing video data to the recording medium 106 a and the camera 100 is changed from the power-on state to the standby state, the power supply unit 109 stops supplying power to the recording unit 106. End up. As a result, the recording unit 106 interrupts the writing of the video data to the recording medium 106a. Therefore, for example, when the command processing unit 103d receives a power-off command from the television 200 while the camera 100 is capturing a still image, the captured still image data is not recorded on the recording medium 106a. There was a problem. There is a problem that still image data captured by the camera 100 is not recorded on the recording medium 106a. In this case, even if the camera 100 is changed from the standby state to the power-on state again, the photographed still image data is not recorded on the recording medium 106a, so that the convenience of the camera 100 is lowered for the user.

  In step S505, the CPU 101 determines whether the recording unit 106 has written video data on the recording medium 106a, and does not execute the power-off command according to the determination result. Note that the processing in step S505 is referred to as “second determination processing”.

  If the CPU 101 determines that the recording unit 106 is writing video data on the recording medium 106a (YES in step S505), the process proceeds from step S505 to step S511. The situation in which the recording unit 106 is writing video data on the recording medium 106a is a situation in which the CPU 101 performs the process of step S305 in the live view shooting process of FIG. In addition to the processing in step S305, when the operation mode of the camera 100 is the continuous shooting mode and the recording unit 106 continuously writes still image data on the recording medium 106a, the CPU 101 determines that the recording unit 106 is recording medium 106a. It is determined that video data is being written to. Also, when video data recorded on another recording medium is written to the recording medium 106a for backup, the CPU 101 determines that the recording unit 106 is writing video data on the recording medium 106a.

  When the CPU 101 determines that the recording unit 106 has not written video data on the recording medium 106a (NO in step S505), the process proceeds from step S505 to step S506. Note that when the CPU 101 determines that the writing of the video data to the recording medium 106a by the recording unit 106 has already been completed, the process proceeds from step S505 to step S506 in the same manner as NO in step S505.

  In step S506, the CPU 101 determines whether the camera 100 is performing live view shooting.

  When the command processing unit 103d receives a power-off command from the television 200 (YES in step S503), the CPU 101 executes the power-off command and sets the power supply unit 109 so as to change the camera 100 from the power-on state to the standby state. Control. When the camera 100 is performing live view shooting, when the camera 100 is changed from the power-on state to the standby state, the power supply unit 109 stops supplying power to the imaging unit 104 and the image processing unit 105. End up. As a result, the imaging unit 104 and the image processing unit 105 interrupt live view shooting. For this reason, when the user is performing live view shooting with the camera 100, a situation in which a photo opportunity is missed occurs, and the convenience of the camera 100 is reduced.

  In step S506, the CPU 101 determines whether or not the camera 100 is performing live view shooting, and does not execute the power-off command according to the determination result. Note that the processing in step S506 is referred to as “third determination processing”.

  Whether the camera 100 is performing live view shooting is determined based on whether the imaging unit 104 and the image processing unit 105 are generating video data from the optical image of the subject.

  When the imaging unit 104 and the image processing unit 105 generate video data from the optical image of the subject, the CPU 101 determines that the camera 100 is performing live view shooting. If the CPU 101 determines that the camera 100 is performing live view shooting (YES in step S506), the process proceeds from step S506 to step S511.

  When the imaging unit 104 and the image processing unit 105 have not generated video data from the optical image of the subject, the CPU 101 determines that the camera 100 is not performing live view shooting.

  If the CPU 101 determines that the camera 100 is not performing live view shooting (NO in step S506), the process proceeds from step S506 to step S507.

  Note that the determination in step S506 is performed based on whether or not the CPU 101 is controlled to move (mirror up) the mirror unit 104b from the position where the optical image of the subject is guided to the viewfinder 104c to the position where it is guided to the image sensor 104a. Also good. In this case, when the mirror unit 104b is at a position for guiding the optical image of the subject to the image sensor 104a, the CPU 101 determines that the camera 100 is performing live view shooting. When the mirror unit 104b is at a position for guiding the optical image of the subject to the viewfinder 104c, the CPU 101 determines that the camera 100 is not performing live view shooting.

  In step S507, the CPU 101 executes the power-off command received from the television 200 by the command processing unit 103d. When the power off command is supplied from the communication unit 103, the CPU 101 sets the auto power off flag stored in the memory 102 from “OFF” to “ON”. When the CPU 101 sets the auto power off flag stored in the memory 102 to “ON”, the process proceeds from step S507 to step S508.

  If the auto power off flag stored in the memory 102 has already been set to “ON”, the CPU 101 may omit the process of step S507.

  In step S508, the CPU 101 changes the set time T stored in the memory 102 to the set time S that is shorter than the set time T. For example, when the set time T stored in the memory 102 is “1 minute”, the CPU 101 changes the set time T to the set time S “30 seconds”. For example, when the set time T is “4 minutes”, the CPU 101 may change the set time T to “1 minute” which is the set time S. The set time S may be 0 minutes or 1 to 10 seconds as long as it is a predetermined time shorter than the set time T. When the set time T is changed to the set time S by the CPU 101, the set time S is overwritten instead of the set time T and stored in the memory 102. When the set time S is stored in the memory 102, when the timer (not shown) is not measuring the measurement time K, the CPU 101 controls the timer (not shown) to start measuring the measurement time K. In this case, the CPU 101 does not change the camera 100 from the power-on state to the standby state until the measurement time K reaches the set time S. When the set time T is changed to the set time S by the CPU 101, the flowchart proceeds from step S508 to step S509.

  When the set time S is already stored in the memory 102 instead of the set time T, the CPU 101 may omit the process of changing the set time T in step S508 to the set time S. In this case, when a timer (not shown) is not measuring the measurement time K, the CPU 101 controls the timer (not shown) so as to start measuring the measurement time K.

  In step S509, the CPU 101 determines whether or not the measurement time K measured by a timer (not shown) has reached the set time S. When the CPU 101 determines that the measurement time K has not reached the set time S (NO in step S509), the flowchart returns from step S509 to step S504.

  When an operation signal is supplied from the operation unit 108 to the CPU 101 before the measurement time K reaches the set time S, the CPU 101 stops measuring the measurement time K by a timer (not shown) and stores the measurement time stored in the memory 102. Erase K. Also in this case, in the same manner as NO in step S509, the flowchart returns from step S509 to step S504. In addition, when any one of the CEC command and the control command is supplied from the communication unit 103 to the CPU 101 before the measurement time K reaches the set time S, the CPU 101 stops measuring the measurement time K by a timer (not shown). The measurement time K is erased from the memory 102. Also in this case, in the same manner as NO in step S509, the flowchart returns from step S509 to step S504.

  If any one of the operation signal, the CEC command, and the control command is supplied to the CPU 101 before the measurement time K reaches the set time S, the CPU 101 stops the measurement of the measurement time K. Do not change to the power off state. Thereby, even if the camera 100 executes the power-off command, the operation signal, the CEC command, and the control command are accepted until the measurement time K reaches the set time S. Therefore, when an operation signal for turning on the camera 100 is supplied to the CPU 101 until the measurement time K reaches the set time S, the CPU 101 changes the camera 100 from the power on state to the power off state. Instead, the camera 100 is held in a power-on state. Similarly, when the CEC command for turning on the camera 100 is supplied to the CPU 101 until the measurement time K reaches the set time S, the CPU 101 changes the camera 100 from the power on state to the power off state. Without holding, the camera 100 is held in a power-on state. Similarly, when a control command for turning on the camera 100 is supplied to the CPU 101 until the measurement time K reaches the set time S, the CPU 101 changes the camera 100 from the power-on state to the power-off state. Without holding the camera 100 in the power-on state.

  If the CPU 101 determines that the measurement time K has reached the set time S (YES in step S509), the process proceeds from step S509 to step S510. When the set time S is “0 minutes”, the CPU 101 omits the process of step S509 and the process proceeds from step S508 to step S510.

  In step S <b> 510, the CPU 101 controls the power supply unit 109 to stop the power supply to the communication unit 103, the imaging unit 104, the image processing unit 105, the recording unit 106, and the display unit 107. In this case, the CPU 101 controls the power supply unit 109 so that power supply to the CPU 101, the memory 102, and the operation unit 108 is not stopped. When the CPU 101 executes the power-off command received from the TV 200, the camera 100 is set to “ON” for the auto power-off setting, and when the set time S shorter than the set time T has elapsed, the camera 100 is turned on. Change from state to standby state. When the camera 100 receives the power-off command received from the television 200, the camera 100 changes the camera 100 to the standby state according to the auto power-off function. Therefore, when the user wants to turn the camera 100 on again, the camera 100 can change the camera 100 to the power-on state earlier than when changing the camera 100 from the power-off state to the power-on state. Further, when the auto power off function of the camera 100 is already enabled, the camera 100 is changed to the standby state earlier than the set time T elapses in conjunction with the television 200 being changed to the power off state. can do.

  When power supply to the communication unit 103, the imaging unit 104, the display unit 107, the recording unit 106, and the display unit 204 is stopped while the power supply unit 109 supplies power to the CPU 101, the memory 102, and the operation unit 108 This flowchart ends.

  In step S511, the CPU 101 discards the power-off command supplied from the command processing unit 103d without executing it. In this case, since the CPU 101 does not control the power supply unit 109 to stop the power supply to the communication unit 103, the imaging unit 104, the image processing unit 105, the recording unit 106, and the display unit 107, the camera 100 is in a power-on state. Will not change from standby to standby. When the CPU 101 discards the power-off command received by the command processing unit 103d from the television 200, this flowchart ends.

  As described above, when the camera 100 according to the first embodiment receives the <Standby> command from the television 200 and is in a state of being connected to the printer 400, the camera 100 stands by without executing the <Standby> command. The state has not been changed.

  Thereby, the communication state between the camera 100 and the printer 400 is not interrupted by the <Standby> command transmitted from the television 200. Therefore, even when the camera 100 receives the <Standby> command from the television 200 when transmitting video data to the printer 400, the camera 100 can transmit the video data to the printer 400. As a result, the camera 100 does not need to redo the communication authentication between the camera 100 and the printer 400 and the generation of video data suitable for the printing capability of the printer 400, so that the convenience of the camera can be improved.

  Further, when the camera 100 according to the first embodiment receives the <Standby> command from the television 200, when the video data is recorded on the recording medium, the camera 100 is set to the standby state without executing the <Standby> command. Changed not to change.

  Thereby, the process of recording the video data performed by the camera 100 on the recording medium is not interrupted by the <Standby> command transmitted from the television 200.

  For this reason, even when the camera 100 receives the <Standby> command from the television 200 while the video data is being recorded on the recording medium, the camera 100 continues the process of recording the video data on the recording medium. As a result, there is no situation where the camera 100 is changed to the standby state even though the video data is not recorded on the recording medium, so that the convenience of the camera 100 can be improved.

  Furthermore, when receiving the <Standby> command from the television 200, the camera 100 according to the first embodiment does not execute the <Standby> command and does not change the camera 100 to the standby state when performing live view shooting. I made it.

  Thereby, since the live view shooting by the camera 100 is not interrupted by the <Standby> command transmitted from the television 200, the user can continue the live view shooting. As a result, a situation where the user misses a photo opportunity can be prevented, and the convenience of the camera 100 can be improved.

  Furthermore, when the camera 100 according to the first embodiment is not connected to the printer 400 and does not record video data on a recording medium or perform live view shooting, a <Standby> command transmitted from the television 200 is used. Was made to run.

  The camera 100 that has executed the <Standby> command enables the auto power-off function, and changes the camera 100 from the power-on state to the standby state after a predetermined time has elapsed. In addition, when the auto power-off function has already been enabled, the camera 100 that has executed the <Standby> command changes the camera 100 from the power-on state to the standby state after a predetermined time shorter than the preset time has elapsed. Change to state. Therefore, the camera 100 is changed from the power-on state to the standby state faster than the time that has already been set.

  Thereby, since the camera 100 is changed from the power-on state to the standby state, the power consumption consumed by the camera 100 can be reduced.

  If the user accidentally turns off the TV 200, the camera 100 is not changed to the standby state in conjunction with the TV 200 until a predetermined time elapses. Can be improved. Therefore, the camera 100 that has executed the <Standby> command changes the camera 100 from the power-on state to the standby state when an operation for turning on the camera 100 is performed before a predetermined time elapses. And keep the power on.

  In the first determination process (step S504), the CPU 101 determines whether the camera 100 is connected to the printer 400 via the USB terminal 103b and the USB cable 500 based on information other than the connection state information. May be.

  Note that the standby state of the camera 100 may be a state where the power supply unit 109 supplies power to the CPU 101, the memory 102, the operation unit 108, and the communication unit 103 of the camera 100.

  In this case, in step S510, the CPU 101 controls the power supply unit 109 so as to stop power supply to the imaging unit 104, the image processing unit 105, the recording unit 106, and the display unit 107. In this case, the CPU 101 controls the power supply unit 109 so that power supply to the CPU 101, the memory 102, the communication unit 103, and the operation unit 108 is not stopped. Accordingly, the communication unit 103 can receive the CEC command transmitted from the television 200 via the HDMI cable 300.

  Therefore, when the camera 100 receives a CEC command for turning on the camera 100 from the television 200, the camera 100 is turned on even if the user does not perform an operation for turning on the camera 100. Can be changed. Furthermore, the camera 100 can reduce power consumption of the entire camera 100 and can continue communication with the television 200 via the HDMI cable 300 and communication with the printer 400 via the USB cable 500.

[Example 2]
Next, Example 2 will be described with reference to FIGS. In the second embodiment, description of the same parts as in the first embodiment is omitted, and different parts from the first embodiment are described.

  FIG. 6 is a flowchart for explaining a power-off process performed in the communication system (HDMI system) according to the second embodiment. The power-off process in FIG. 6 is also a process performed to realize the system standby described in the CEC standard, similarly to the power-off process in FIG. The processes performed in steps S501 to S511 of the flowchart shown in FIG. 6 are the same as the processes performed in steps S501 to S511 of the flowchart shown in FIG. Therefore, in Example 2, description of steps S501 to S511 is omitted.

  6 is a process performed when a power-off command is received from the television 200. In the second embodiment, a case where the CPU 101 controls the power-off process according to a computer program stored in the memory 102 will be described.

  If the CPU 101 determines that the camera 100 is connected to the printer 400 via the USB terminal 103b and the USB cable 500 (YES in step S504), the process proceeds from step S504 to step S601.

  In step S601, the CPU 101 determines whether the printer 400 to which the camera 100 is connected via the USB terminal 103b and the USB cable 500 is a predetermined device. The process of step S601 is referred to as “fourth determination process”.

  The predetermined device is a recording device such as a hard disk drive (hereinafter referred to as HDD).

  When the camera 100 is connected to the HDD via the USB terminal 103b and the USB cable 500, the video data recorded on the HDD is transmitted to the camera 100, and the display unit 107 browses the video data received from the HDD. There is a high possibility. In this case, since the HDD supplies video data and audio data to the camera 100 in the same manner as the recording medium 106 a that can be attached to and detached from the camera 100, even if the camera 100 is changed from the power-on state to the standby state, it is not much for the user. The burden is not expected.

  The CPU 101 determines whether the printer 400 connected to the camera 100 via the USB terminal 103b and the USB cable 500 is a predetermined device based on the device information of the printer 400 in the memory 102 and the identification information indicating the predetermined device. Determine whether or not. It is assumed that identification information indicating a predetermined device is recorded in the memory 102.

  If the device information of the printer 400 matches the identification information indicating the predetermined device (YES in step S601), the CPU 101 determines that the printer 400 connected to the camera 100 via the USB terminal 103b and the USB cable 500 is predetermined. It is determined that this is a device. In this case (YES in step S601), the flowchart proceeds from step S601 to step S505.

  If the device information of the printer 400 does not match the identification information indicating the predetermined device, the CPU 101 determines that the printer 400 to which the camera 100 is connected via the USB terminal 103b and the USB cable 500 is not a predetermined device. In this case (NO in step S601), the flowchart proceeds from step S601 to step S511.

  The predetermined device has a reading unit that reads video data or audio data from a recording medium, and other than the HDD, as long as it is a transmission device that transmits video data or audio data read from the recording medium to the camera 100. It may be a device. The predetermined device may be set by the user.

  As described above, when the camera 100 according to the second embodiment receives the <Standby> command from the television 200, when the camera 100 is not connected to a predetermined device, the camera 100 is not executed without executing the <Standby> command. Changed not to change to standby mode.

  Thereby, the communication state between the camera 100 and a device other than the predetermined device is not interrupted by the <Standby> command transmitted from the television 200. As a result, the user does not need to redo the communication authentication between the camera 100 and a device other than the predetermined device and the operation associated with the camera 100 transmitting video data to a device other than the predetermined device. Convenience can be improved.

  Further, the camera 100 according to the second embodiment performs the same process as the first embodiment except for the process performed in step S601 in FIG.

[Other Embodiments]
The communication apparatus according to the present invention is not limited to the communication apparatus 100 described in the first embodiment. The communication device according to the present invention can be realized by a system including a plurality of devices, for example.

  The configuration and functions described in the first embodiment can also be realized by a computer program that can be executed by a computer. In this case, the computer program is read out from the computer-readable recording medium by the computer and executed by the computer. In this case, a hard disk device, an optical disk, a CD-ROM, a CD-R, a memory card, a ROM, or the like can be used as the computer-readable recording medium. The computer program may be provided from an external device to the computer via a communication interface and executed by the computer.

100 communication device 101 CPU
DESCRIPTION OF SYMBOLS 102 Memory 103 Communication part 104 Imaging part 105 Image processing part 106 Recording part 107 Display part 108 Operation part 109 Power supply part 200 1st external device 201 CPU
202 tuner unit 203 communication unit 204 display unit 205 operation unit 206 memory 207 power supply unit 208 remote control signal reception unit 209 remote control 300 connection cable (HDMI cable)
301 TMDS line 302 CEC line 400 Second external device 500 Connection cable (USB cable)
501 data line

Claims (10)

In a communication device that receives a command conforming to the CEC standard included in the HDMI standard from the first external device,
When the communication device is in the first state, a power-off command for instructing to change the communication device to a second state with lower power consumption than the first state is sent to the first external device. Control means for changing the communication device from the first state to the second state after a predetermined time has elapsed when received from the device;
Transmitting means for transmitting video data corresponding to the second external device to a second external device;
First determination means for determining whether or not the transmission means is in a communicable state capable of transmitting the video data to the second external device;
When the transmission unit is in the communicable state, the control unit discards the power-off command so as not to change the communication device from the first state to the second state. A communication device.   The communication device according to claim 1, wherein the control unit does not change the communication device from the first state to the second state until the predetermined time has elapsed. First power supply means for supplying power to the transmission means;
The first state is a state in which the control unit controls the first power supply unit to supply the power to the transmission unit, and the second state is a state in which the transmission unit The communication apparatus according to claim 1, wherein the control unit controls the first power supply unit so as not to supply power. Recording means for recording video data on a recording medium,
Second determination means for determining whether or not the recording means uses the video data as the recording medium;
When the transmission means is not in the communicable state, when the recording means is recording the video data on the recording medium, the control means discards the power-off command, thereby causing the communication device to 4. The communication apparatus according to claim 1, wherein the state is not changed from the state 1 to the second state. 5. A second power supply means for supplying power to the recording means;
The first state is a state in which the control unit controls the second power supply unit so as to supply the power to the recording unit, and the second state is a state in which the recording unit includes the recording unit. The communication apparatus according to claim 4, wherein the control unit controls the second power supply unit so as not to supply power. The communication device includes photographing means for generating video data from an optical image of a subject,
Third determination means for determining whether or not the photographing means is generating the video data from the optical image of the subject;
When the transmission means is not in the communicable state, when the photographing means is generating the video data from the optical image of the subject, the control means discards the power-off command to The communication apparatus according to claim 1, wherein the first state is not changed to the second state. A third power supply means for supplying power to the photographing means;
The first state is a state in which the control unit controls the third power supply unit to supply the power to the imaging unit, and the second state is a state in which the imaging unit The communication apparatus according to claim 6, wherein the control unit controls the third power supply unit so as not to supply power. Fourth determination means for determining whether or not the second external device is a predetermined device when the transmission means is in the communicable state;
When the second external device is not the predetermined device, the control unit discards the power-off command so as not to change the communication device from the first state to the second state. The communication device according to claim 1, wherein the communication device is a device. The predetermined apparatus includes a reading unit that reads video data recorded on a recording medium from the recording medium;
9. The communication apparatus according to claim 8, further comprising a transmission unit that transmits the video data read by the reading unit to the communication apparatus.   The communication apparatus according to claim 1, wherein the power-off command is a <Standby> command defined by the CEC standard.

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