JP2010140291A - Data receiver and power supply control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption during standby and to reduce user's initialization entries. <P>SOLUTION: When a disk player connected to an HDMI terminal 201 through an HDMI cable is powered on and when a television receiver 200 is in a standby state, +5V power supply is sent from the disk player through a +5V power supply line. This automatically turns on a connection switch 251 to supply the +5V power supply to a CEC (Consumer Electronics Control) function part 209. In this case, a connection switch 252 is turned off by an another function part 253 not to supply standby power supply to the CEC function part 209. When the disk player is in a standby state and when the television receiver 200 is powered on, the another function part 253 turns on the connection switch 252 to supply the standby power supply to the CEC function part 209 even though the +5V power supply is not sent from the disk player. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data receiving apparatus and a power supply control method, and more particularly to a data receiving apparatus including a communication unit that communicates control signals with an external device.

  In recent years, for example, from a DVD (Digital Versatile Disc) player, a set top box (STB), and other AV sources (Audio Visual source) to a television receiver, a projector, and other displays are not compressed ( As a communication interface for transmitting a baseband digital video signal (image data) and a digital audio signal (audio data) accompanying the digital video signal at high speed, HDMI (High Definition Multimedia Interface) is becoming widespread. .

  HDMI is arranged for AV (Audio Visual) devices by adding an audio transmission function and a copyright protection function to DVI (Digital Visual Interface), which is a connection standard for PCs (Personal Computers) and displays. For example, Non-Patent Document 1 describes details of the HDMI standard.

  Conventionally, a plurality of cables for video, audio, and control signals have been used for connection between devices. However, HDMI requires only one cable, and the control signal supports bidirectional transmission. Therefore, for example, by relaying a control signal from a television receiver to an output device such as a DVD player or a set-top box connected via HDMI, the entire AV system can be operated with the television receiver remote control. .

  In the HDMI standard, inter-device control using CEC (Consumer Electronics Control) is defined. According to this CEC, various controls are possible based on a specific physical address and logical address assigned to each device existing on the HDMI network. For example, when a user is watching a digital broadcast on a television receiver and plays a DVD player connected by HDMI, the television receiver automatically switches to the input to which the DVD player is connected. Further, menu operations displayed on the DVD player, power on / off, and the like can be operated from the remote control of the television receiver.

  The HDMI-connected source device and sink device need to activate a circuit for the CEC function (CEC function unit) even when each device is in a standby state. However, it is an urgent task for sink devices to reduce standby power in the standby state. For this reason, in the factory shipment setting, the CEC function is set to OFF so that standby power is not consumed more than necessary.

  As described above, when the CEC function of the sink device is set to OFF in the factory setting, it is necessary to manually change the OFF setting of the sink device when the user connects the CEC compatible source device. That is, the user's initial setting items are increased accordingly, which is troublesome for the user.

For example, Patent Document 1 proposes a reduction in power consumption by power control of a source device connected via HDMI, but does not propose any power control for reducing power consumption of a sink device.
High-Definition Multimedia Interface Specification Version 1.3a, November 10 2006 JP 2007-274296 A

  As described above, no power supply control for reducing the power consumption of the sink device among the source devices and the sink devices connected via HDMI has been proposed.

  An object of the present invention is to reduce the power consumption when the sink device is in a standby state (standby state) and to reduce the initial setting items of the user related to the sink device.

The concept of this invention is
A data receiver for receiving content data from an external device;
A communication unit for communicating a control signal with the external device;
When the power is supplied from the external device via the power supply line during standby, the data receiving apparatus includes a power supply unit that supplies the power to the communication unit.

  In the present invention, content data (image data, audio data) is received from an external device by the data receiving unit. In this case, for example, content data is received from an external device via a transmission path, for example, an HDMI TMDS channel, by a differential signal using a plurality of channels. In addition, the communication unit communicates control signals with external devices. This control signal is, for example, a CEC signal transmitted / received via the CEC line of the HDMI cable.

  When power is supplied from an external device via a power supply line during standby, this power is supplied to the communication unit by the power supply unit. Therefore, the communication unit is in an active state, and control signals can be communicated with the external device. The power source supplied from the external device is, for example, a power source for reading at least information related to the performance of the external device held in the information storage unit.

  Thus, when power is supplied from an external device during standby, this power is supplied to the communication unit so that control signals can be communicated with the external device, thereby controlling the external device. It is not necessary to always supply power to the communication unit during standby for signal communication, and power consumption can be reduced. Further, in order to reduce power consumption, for example, it is not necessary to turn off the CEC function in factory shipment settings, and the user does not need to cancel the setting, and the user's initial setting items can be reduced.

  In the present invention, for example, a power supply circuit for obtaining standby power to be supplied to the standby microcomputer is further provided, and the power supply unit is supplied from the standby power obtained by the power supply circuit or an external device via the power supply line when the power is turned on. The power is supplied to the communication unit. Thereby, when the power is turned on, power is supplied to the communication unit, so that the communication unit can communicate a control signal with an external device. In this case, it is not necessary to supply power to the communication unit in advance, and power consumption can be reduced.

  According to the present invention, the data receiving unit receives content data from an external device, and the communication unit communicates a control signal with the external device. When power is supplied, this power is supplied to the communication unit, so that power consumption during standby can be reduced and the initial setting items of the user can be reduced.

Hereinafter, the best mode for carrying out the invention (hereinafter referred to as “embodiment”) will be described. The description will be given in the following order.
1. Embodiment 2. FIG. Modified example

<1. Embodiment>
[Example of AV system configuration]
FIG. 1 shows a configuration example of an AV (Audio Visual) system 10 as an embodiment. The AV system 10 includes a disc player 100 as a source device and a television receiver 200 as a sink device. The disc player 100 and the television receiver 200 are connected via an HDMI cable 300. The disc player 100 is provided with an HDMI terminal 101 to which an HDMI transmission unit (HDMITX) 102 is connected. The television receiver 200 is provided with an HDMI terminal 201 to which an HDMI receiving unit (HDMI RX) 202 is connected. One end of the HDMI cable 300 is connected to the HDMI terminal 101 of the disc player 100, and the other end of the HDMI cable 300 is connected to the HDMI terminal 201 of the television receiver 200.

[Description of HDMI system]
FIG. 2 shows an HDMI connection portion of the disc player 100 and the television receiver 200 in the AV system 10 of FIG.

  The HDMI transmitting unit 102 transmits a differential signal corresponding to pixel data of an uncompressed image for one screen to the HDMI receiving unit 202 through a plurality of channels in the active video section. Here, the active video section is an effective image section that is a section obtained by removing a horizontal blanking section and a vertical blanking section from a section from one vertical synchronization signal to the next vertical synchronization signal. The HDMI transmission unit 102 transmits, at a plurality of channels, a differential signal corresponding to at least audio data, control data, and other auxiliary data associated with an image in the horizontal blanking interval or the vertical blanking interval using a plurality of channels. Send in one direction.

  For example, the HDMI transmitting unit 102 converts pixel data of an uncompressed image into a corresponding differential signal, and serially transmits the data to the HDMI receiving unit 202 in one direction using TMDS channels # 0, # 1, and # 2. Also, the HDMI transmission unit 102 converts audio data, control data, and other auxiliary data associated with an uncompressed image into corresponding differential signals, and the HDMI reception unit uses TMDS channels # 0, # 1, and # 2. In 202, serial transmission is performed in one direction.

  Further, the HDMI transmission unit 102 transmits the pixel clock synchronized with the pixel data transmitted through the TMDS channels # 0, # 1, and # 2 to the HDMI reception unit 202 through the HDMI cable 300 using the TMDS clock channel. Here, in one TMDS channel #i (i = 0, 1, 2), 10-bit pixel data is transmitted during one pixel clock.

  The HDMI receiving unit 202 receives a differential signal corresponding to the pixel data transmitted from the HDMI transmitting unit 102 in one direction on a plurality of channels in the active video section. In addition, the HDMI receiving unit 202 receives differential signals corresponding to audio data and control data transmitted in one direction from the HDMI transmitting unit 102 through a plurality of channels in a horizontal blanking interval or a vertical blanking interval. Receive. That is, the HDMI receiving unit 202 corresponds to differential signals corresponding to pixel data, audio data, and control data transmitted in one direction from the HDMI transmitting unit 102 via TMDS channels # 0, # 1, and # 2. The differential signal is received in synchronization with the pixel clock.

  Transmission channels of the HDMI system include transmission channels called a DDC (Display Data Channel) 83 and a CEC line 84, in addition to the above-described TMDS channels # 0 to # 2 and the TMDS clock channel. The DDC 83 includes two signal lines (not shown) included in the HDMI cable 300. The DDC 83 is used by the disc player 100 (source device) to read EDID (Enhanced Extended Display Identification Data) from the television receiver 200 (sink device).

  That is, the television receiver 200 has an EDID ROM (Read Only Memory) 85 as an information storage unit that stores at least EDID that is information related to its performance (Configuration / capability) in addition to the HDMI receiving unit 102. Have. A control unit (not shown) of the disc player 100 reads the EDID from the EDID ROM 85 of the television receiver 200 via the DDC 83. Based on the EDID, the control unit of the disc player 100 can recognize the performance of the television receiver 200, for example, the video format, color format, and the like that the television receiver 200 can support.

  The CEC line 84 is composed of one signal line (not shown) included in the HDMI cable 300, and constitutes a control data line. The CEC line 84 is used for bidirectional communication of CEC signals (control data) between the disc player 100 (source device) and the television receiver 200 (sink device).

  The HDMI cable 300 includes an HPD line 86 connected to a pin called HPD (Hot Plug Detect). The disc player 100 (source device) can detect the connection of the television receiver 200 (sink device) using the HPD line 86. Further, the HDMI cable 300 includes a power line 87 and a reserved line 88 that are used to supply + 5V power from the disc player 100 (source device) to the television receiver 200 (sink device).

  The + 5V power supply via the power supply line 87 described above is originally used for the disc player 100 (source device) to read EDID from the EDIDROM 85 of the television receiver (sink device) 200. In this embodiment, the + 5V power is further supplied to a communication unit (CEC function unit) that communicates the CEC control signal described above. As a result, the CEC function unit can be activated when the television receiver (sink device) 200 is on standby.

  FIG. 3 shows a configuration example of the HDMI transmission unit 102 of the disc player 100 and the HDMI reception unit 202 of the television receiver 200.

  The HDMI transmission unit 102 includes three encoder / serializers 81A, 81B, and 81C corresponding to the three TMDS channels # 0, # 1, and # 2, respectively. Each of the encoders / serializers 81A, 81B, and 81C encodes image data, auxiliary data, and control data supplied thereto, converts the parallel data into serial data, and transmits the data by a differential signal. Here, when the image data has, for example, three components of R (red), G (green), and B (blue), the B component is supplied to the encoder / serializer 81A, and the G component is supplied to the encoder / serializer 81B. , R components are supplied to the encoder / serializer 81C.

  Examples of auxiliary data include voice data and control packets. The control packet is supplied to, for example, the encoder / serializer 81A, and the audio data is supplied to, for example, the encoder / serializers 81B and 81C. The control data includes a 1-bit vertical synchronization signal (VSYNC), a 1-bit horizontal synchronization signal (HSYNC), and 1-bit control bits CTL0, CTL1, CTL2, and CTL3. The vertical synchronization signal and the horizontal synchronization signal are supplied to the encoder / serializer 81A. The control bits CTL0 and CTL1 are supplied to the encoder / serializer 81B, and the control bits CTL2 and CTL3 are supplied to the encoder / serializer 81C.

  The encoder / serializer 81A transmits the B component of the image data, the vertical synchronization signal and the horizontal synchronization signal, and auxiliary data supplied thereto in a time division manner. That is, the encoder / serializer 81A converts the B component of the image data supplied thereto into 8-bit parallel data that is a fixed number of bits. Further, the encoder / serializer 81A encodes the parallel data, converts it into serial data, and transmits it through the TMDS channel # 0.

  The encoder / serializer 81A encodes the 2-bit parallel data of the vertical synchronization signal and horizontal synchronization signal supplied thereto, converts the data into serial data, and transmits the serial data through the TMDS channel # 0. Furthermore, the encoder / serializer 81A converts the auxiliary data supplied thereto into parallel data in units of 4 bits. Then, the encoder / serializer 81A encodes the parallel data, converts it into serial data, and transmits it through the TMDS channel # 0.

  The encoder / serializer 81B transmits the G component of the image data, control bits CTL0 and CTL1, and auxiliary data supplied thereto in a time division manner. That is, the encoder / serializer 81B sets the G component of the image data supplied thereto as parallel data in units of 8 bits, which is a fixed number of bits. Further, the encoder / serializer 81B encodes the parallel data, converts it into serial data, and transmits it through the TMDS channel # 1.

  The encoder / serializer 81B encodes the 2-bit parallel data of the control bits CTL0 and CTL1 supplied thereto, converts the data into serial data, and transmits the serial data through the TMDS channel # 1. Furthermore, the encoder / serializer 81B converts the auxiliary data supplied thereto into parallel data in units of 4 bits. Then, the encoder / serializer 81B encodes the parallel data, converts it into serial data, and transmits it through the TMDS channel # 1.

  The encoder / serializer 81C transmits the R component of the image data, control bits CTL2 and CTL3, and auxiliary data supplied thereto in a time division manner. That is, the encoder / serializer 81C sets the R component of the image data supplied thereto as parallel data in units of 8 bits, which is a fixed number of bits. Further, the encoder / serializer 81C encodes the parallel data, converts it into serial data, and transmits it through the TMDS channel # 2.

  The encoder / serializer 81C encodes 2-bit parallel data of the control bits CTL2 and CTL3 supplied thereto, converts the data into serial data, and transmits the serial data through the TMDS channel # 2. Furthermore, the encoder / serializer 81C converts the auxiliary data supplied thereto into parallel data in units of 4 bits. Then, the encoder / serializer 81C encodes the parallel data, converts it into serial data, and transmits it through the TMDS channel # 2.

  The HDMI receiving unit 202 includes three recovery / decoders 82A, 82B, and 82C corresponding to the three TMDS channels # 0, # 1, and # 2, respectively. Each of the recovery / decoders 82A, 82B, and 82C receives image data, auxiliary data, and control data transmitted as differential signals through the TMDS channels # 0, # 1, and # 2. Further, each of the recovery / decoders 82A, 82B, and 82C converts image data, auxiliary data, and control data from serial data to parallel data, and decodes and outputs them.

  That is, the recovery / decoder 82A receives the B component of the image data, the vertical synchronization signal, the horizontal synchronization signal, and the auxiliary data that are transmitted as differential signals through the TMDS channel # 0. Then, the recovery / decoder 82A converts the B component of the image data, the vertical synchronization signal, the horizontal synchronization signal, and the auxiliary data from serial data to parallel data, and decodes and outputs them.

  The recovery / decoder 82B receives the G component of the image data, the control bits CTL0 and CTL1, and the auxiliary data transmitted by the differential signal through the TMDS channel # 1. The recovery / decoder 82B converts the G component of the image data, control bits CTL0 and CTL1, and auxiliary data from serial data to parallel data, and decodes and outputs the data.

  The recovery / decoder 82C receives the R component of the image data, the control bits CTL2 and CTL3, and the auxiliary data transmitted by the differential signal through the TMDS channel # 2. The recovery / decoder 82C converts the R component of the image data, the control bits CTL2 and CTL3, and auxiliary data from serial data to parallel data, and decodes and outputs them.

  FIG. 4 shows an example of the structure of TMDS transmission data. FIG. 4 shows sections of various transmission data when image data of horizontal × vertical 1920 pixels × 1080 lines is transmitted in TMDS channels # 0, # 1, and # 2. In a video field (Video Field) in which transmission data is transmitted through the three TMDS channels # 0, # 1, and # 2 of HDMI, there are three types of sections according to the type of transmission data. These three types of sections are a video data period, a data island period, and a control period.

  The video field period is a period from a rising edge (active edge) of a certain vertical synchronizing signal to a rising edge of the next vertical synchronizing signal. This section is divided into a horizontal blanking period (horizontal blanking), a vertical blanking period (verticalblanking), and an active video section (Active Video) that is a section obtained by excluding the horizontal and vertical blanking periods from the video field section. It is done.

  The video data section is assigned to the active video section. In this video data section, 1920 pixel (pixel) × 1080 line effective pixel (Active pixel) data constituting uncompressed image data for one screen is transmitted.

  The data island period and the control period are assigned to the horizontal blanking period and the vertical blanking period. In the data island section and the control section, auxiliary data (Auxiliary data) is transmitted. That is, the data island period is assigned to a part of the horizontal blanking period and the vertical blanking period. In this data island period, for example, audio data packets, which are data not related to control, of auxiliary data are transmitted.

  The control period is allocated to other parts of the horizontal blanking period and the vertical blanking period. In this control period, for example, vertical synchronization signals, horizontal synchronization signals, control packets, and the like, which are data related to control, of auxiliary data are transmitted.

  FIG. 5 shows an example of the pin arrangement of the HDMI terminals 101 and 201. The pin arrangement shown in FIG. 5 is called type A (type-A). TMDSData # i + and TMDS Data # i-, which are differential signals of TMDS channel #i, are transmitted on the two lines with pins to which TMDS Data # i + is assigned (pin numbers 1, 4, and 7) ) And TMDS Data # i- assigned pins (pin numbers 3, 6, 9).

  A CEC line 84 through which a CEC signal as control data is transmitted is connected to a pin having a pin number of 13, and a pin having a pin number of 14 is a reserved pin. A line through which an SDA (Serial Data) signal such as EDID is transmitted is connected to a pin having a pin number of 16. In addition, a line through which an SCL (Serial Clock) signal, which is a clock signal used for synchronization during transmission / reception of the SDA signal, is connected to a pin having a pin number of 15. The above-described DDC 83 includes a line for transmitting the SDA signal and a line for transmitting the SCL signal.

  Further, as described above, the HPD line 86 for detecting the connection of the sink device by the source device is connected to the pin having the pin number 19. Further, as described above, the power supply line 87 for supplying power is connected to the pin having the pin number 18.

[Main components of disc player and TV receiver]
FIG. 6 shows a configuration example of a main part of the disc player 100. The disc player 100 includes an HDMI terminal 101, an HDMI transmission unit 102, a main microcomputer 103, a standby microcomputer 104, a key input unit 105, and a remote control reception unit 106. The disc player 100 includes a main power supply circuit 107, a standby power supply circuit 108, a CEC function unit 109, an HPD circuit 110, and a pull-down resistor 111.

  The HDMI transmission unit 102 transmits the baseband image data VD and audio data AD obtained by the disc playback unit (not shown) and the control data CD supplied from the main microcomputer 103 to the HDMI cable 300 through communication conforming to HDMI. The data is transmitted in one direction to the television receiver 200 via the TMDS channel.

  The main microcomputer 103 controls the operation of each part of the disc player 100. The standby microcomputer 104 receives and processes the remote control code by the user's operation by the remote control receiving unit 106, and performs an operation process by operating the key input unit 105. The standby microcomputer 104 controls the main power supply circuit 107 to turn on the main power when the disc player 100 receives a power-on remote control signal when the disc player 100 is on standby or when a power-on operation is performed by a key operation. To do.

  The standby microcomputer 104 includes a CEC function unit 109. The CEC function unit 109 transmits / receives CEC signals to / from the television receiver 200 via the CEC line. The main microcomputer 103 reads EDID data from the EDIDROM of the television receiver 200 via the DDC line connected to the standby microcomputer 104.

  The main power supply circuit 107 supplies power to the internal circuit of the disc player 100 and supplies + 5V power to the television receiver 200 via a + 5V power supply line. The standby power supply circuit 108 supplies standby power to the standby microcomputer 104 so that the control operation is possible even during standby. Both the main power supply circuit 107 and the standby power supply circuit 108 generate power from the AC input.

  The HPD circuit 110 detects that a sink device (the television receiver 200 in this embodiment) is connected to the disc player 100 via the HDMI cable 300 based on the voltage of the HPD line. The detection output of the HPD circuit 110 is supplied to the main microcomputer 103. The HPD terminal of the disc player 100 is grounded via a pull-down resistor 111.

  FIG. 7 shows a configuration example of a main part of the television receiver 200. The television receiver 200 includes an HDMI terminal 201, an HDMI receiving unit 202, a main microcomputer 203, a standby microcomputer 204, a key input unit 205, and a remote control receiving unit 206. The television receiver 200 includes a main power supply circuit 207, a standby power supply circuit 208, a CEC function unit 209, an EDIDROM 210, an HPD circuit 211, and a pull-up resistor 212.

  The HDMI receiving unit 202 receives image data VD and audio data AD and control data CD transmitted in one direction from the disc player 100 via the TMDS channel of the HDMI cable 300 by communication conforming to HDMI. The control data CD is supplied from the HDMI receiving unit 202 to the main microcomputer 203. Although not shown, the image data VD is supplied to the display panel via the display processing unit. Furthermore, although not shown, the audio data AD is supplied to a speaker after being converted into an analog signal by a D / A converter.

  The main microcomputer 203 controls the operation of each part of the television receiver 200. The standby microcomputer 204 receives and processes the remote control code by the user's operation by the remote control receiving unit 206, and performs operation processing by operating the key input unit 205. The standby microcomputer 204 controls the main power circuit 207 to turn on the main power when the TV receiver 200 receives a power-on remote control signal when the TV receiver 200 is in a standby state or when a power-on operation is performed by a key operation. To.

  The standby microcomputer 204 incorporates a CEC function unit 209. The CEC function unit 209 transmits and receives CEC signals to and from the disc player 100 via the CEC line. Even when the CEC function unit 209 receives a command related to power control, the standby microcomputer 204 controls the main power circuit 207 to turn on the main power.

  When the television receiver 200 is in a standby state and the disc player 100 is in a power-on state, the CEC function unit 209 is supplied with + 5V power sent from the disc player 100 through a + 5V power line. The The CEC function unit 209 is supplied with standby power obtained by the standby power circuit 208 when the television receiver 200 is in a power-on state and the disc player 100 is in a standby state. Details of power supply to the CEC function unit 209 will be described later.

  The main power supply circuit 207 supplies power to the internal circuit of the television receiver 200. The standby power supply circuit 208 supplies standby power to the standby microcomputer 204 so that the control operation is possible even during standby. Both the main power supply circuit 207 and the standby power supply circuit 208 generate power from the AC input.

  A power line of + 5V is connected to the EDID ROM 210. When the disc player 100 is in a power-on state, the EDIDROM 210 is supplied with + 5V power from the disc player 100 via the + 5V power line. This + 5V power supply is used by the disc player 100 to read EDID from the EDIDROM 210.

  The HPD circuit 211 detects that the source device (the disc player 100 in this embodiment) is connected to the television receiver 200 via the HDMI cable 300 based on the voltage of the HPD line. The detection output of the HPD circuit 211 is supplied to the main microcomputer 203. A 1 kΩ resistor 212 defined by the standard is connected between the + 5V power supply line and the HPD line.

  When the disc player 100 and the television receiver 200 are connected by the HDMI cable 300, the + 5V power supplied from the disc player 100 through the power line is connected to the 19 pin (HPD terminal) of the HDMI terminal 201 of the television receiver 200. The voltage increases. Therefore, the HPD circuit 211 of the television receiver 200 can detect that the source device (disc player 100) is connected to the television receiver 200 via the HDMI cable 300.

  At this time, the voltage at pin 19 (HPD terminal) of the HDMI terminal 101 of the disc player 100 also increases. Therefore, the HPD circuit 110 of the disc player 100 can detect that the sink device (the television receiver 200) is connected to the disc player 100 via the HDMI cable 300.

  In this state, for example, when the HDMI cable 300 is disconnected from the television receiver 200, 19 pins (HPD terminal) of the HDMI terminal 201 of the television receiver 200 and 19 pins (HPD terminal) of the HDMI terminal 101 of the disc player 100. Both voltages are low. Therefore, the HPD circuit 211 of the television receiver 200 and the HPD circuit 110 of the disc player 100 can detect that the HDMI cable 300 is disconnected.

  The operation of the AV system 10 shown in FIGS. 1, 6, and 7 will be described. First, an operation example in a system configuration in which the television receiver 200 is connected to the disc player 100 via the HDMI cable 300 will be described. It is assumed that the disc player 100 is in a power-on state.

  + 5V power is supplied from the disc player 100 to the television receiver 200 through the + 5V power line of the HDMI cable 300. Therefore, the 19-pin voltage at the HDMI terminal 201 of the television receiver 200 increases, and the 19-pin voltage at the HDMI terminal 101 of the disc player 100 also increases.

  The main microcomputer 103 (HPD circuit 110) of the disc player 100 monitors the 19-pin voltage (HPD line voltage) at the HDMI terminal 101. The main microcomputer 103 recognizes that the television receiver 200 is connected to the disc player 100 via the HDMI cable 300 as the voltage increases. The main microcomputer 103 reads the EDID stored in the EDID ROM 210 of the television receiver 200 using the DDC line of the HDMI cable 300 and recognizes the performance of the television receiver 200.

  Next, an operation example after the system configuration will be described. For example, when the user operates playback of the disc player 100, playback is started on the disc player 100. Uncompressed image data VD and audio data AD obtained by a disc playback unit (not shown) are supplied to the HDMI transmission unit 102. In the HDMI transmitting unit 102, the data VD and AD are transmitted in one direction to the television receiver 200 via the HDMI cable 300 by communication conforming to HDMI.

  In the television receiver 200, uncompressed image data VD and audio data transmitted in one direction from the HDMI transmitting unit 102 of the disc player 100 via the HDMI cable 300 by the HDMI receiving unit 202 by communication conforming to HDMI. An AD is received. The image data VD received by the HDMI receiving unit 202 is supplied to the display panel via a display processing unit (not shown), and a reproduced image is displayed. The audio data received by the HDMI receiving unit 202 is supplied to a speaker via a D / A converter (not shown), and reproduced audio is output.

[Power supply to CEC function unit]
The power supply to the CEC function unit 209 built in the standby microcomputer 204 of the television receiver 200 will be described.

  Table 1 shows the relationship between the state of the source device and the sink device and the CEC function (active / inactive) in the sink device.

  When both the source device and the sink device are in the standby state, communication of the CEC signal is not required between the source device and the sink device, and the CEC function in the sink device may be inactive. When the sink device is in a power-on state, the sink device needs to send a command or a polling command to the source device in order to check the physical address and logical address of the source device. Therefore, in this case, it is necessary to activate the CEC function in the sink device regardless of whether the source device is in the standby state or the power-on state. Further, when the source device is powered on and the sink device is in a standby state, the sink device needs to always receive a CEC control command sent from the source device. Therefore, in this case, it is necessary to activate the CEC function in the sink device.

  Therefore, in this embodiment, power is supplied to the CEC function unit 209 built in the standby microcomputer 204 of the television receiver 200 as shown in Table 2.

  When both the disc player 100 (source device) and the television receiver 200 (sink device) are in the standby state, the CEC function may be inactive as described above. Therefore, in this case, power is not supplied to the CEC function unit 209. Further, when the disc player 100 is in a standby state and the television receiver 200 is in a power-on state, it is necessary to activate the CEC function as described above. Therefore, in this case, the power in the television receiver 200, for example, standby power is supplied to the CEC function unit 209.

  Further, when the disc player 100 is in the power-on state and the television receiver 200 is in the standby state, it is necessary to activate the CEC function as described above. Therefore, in this case, + 5V power supplied from the disc player 100 through the + 5V power line is supplied to the CEC function unit 209. Furthermore, when both the disc player 100 and the television receiver 200 are in the power-on state, it is necessary to activate the CEC function as described above. Therefore, in this case, at least the power in the television receiver 200 or +5 V power sent from the disc player 100 through the +5 V power line is supplied to the CEC function unit 209.

  A configuration of the power supply unit 250 that supplies power to the CEC function unit 209 will be described. FIG. 8 shows a configuration example of the power supply unit 250 in the standby microcomputer 204.

  The + 5V power supply line is connected to the CEC function unit 209 via the connection switch 251. The connection switch 251 is supplied with the + 5V power line voltage as an on / off control signal. In this case, the connection switch 251 is turned on when the voltage of the + 5V power supply line becomes + 5V, and is turned off at other times.

  Further, standby power from the standby power supply circuit 208 (see FIG. 7) is supplied to the CEC function unit 209 via the connection switch 252. On / off of the connection switch 252 is controlled by another functional unit 253 in the standby microcomputer 204.

  The flowchart of FIG. 9 shows the control processing of the other functional unit 253. The other functional unit 253 starts the process in step ST1, and then proceeds to the process of step ST2. In step ST2, the other functional unit 253 determines whether or not the television receiver 200 is in a power-on state.

  When the power is not turned on in step ST2, the other functional unit 253 turns off the connection switch 252 in step ST3 so that standby power is not supplied to the CEC function unit 209. The other functional units 253 terminate the process in step ST4 after the process in step ST3.

  When the power is on in step ST2, the other functional unit 253 turns on the connection switch 252 in step ST5 so that standby power is supplied to the CEC functional unit 209. The other functional units 253 terminate the process in step ST4 after the process in step ST5.

  The operation of the power supply unit 250 will be described. When both the disc player 100 (source device) and the television receiver 200 (sink device) are in the standby state, the operation is as follows. In this case, + 5V power is not sent from the disc player 100 via the + 5V power line. In addition, the connection switch 252 is turned off by another function unit 253. Therefore, no power is supplied to the CEC function unit 209.

  Further, when the disc player 100 is in the power-on state and the television receiver 200 is in the standby state, the following occurs. In this case, + 5V power is sent from the disc player 100 through the + 5V power line. Therefore, the voltage of the + 5V power supply line becomes + 5V, the connection switch 251 is turned on, and the + 5V power is supplied to the CEC function unit 209. In this case, since the connection switch 252 is turned off by the other function unit 253, standby power is not supplied to the CEC function unit 209.

  Further, when the disc player 100 is in the standby state and the television receiver 200 is in the power-on state, the following occurs. In this case, + 5V power is not sent from the disc player 100 via the + 5V power line. However, in this case, since the connection switch 252 is turned on by the other function unit 253, standby power is supplied to the CEC function unit 209.

  Further, when both the disc player 100 and the television receiver 200 are in the power-on state, the following occurs. In this case, + 5V power is sent from the disc player 100 through the + 5V power line. Therefore, the voltage of the + 5V power supply line becomes + 5V, the connection switch 251 is turned on, and the + 5V power is supplied to the CEC function unit 209. In this case, since the connection switch 252 is turned on by another function unit 253, standby power is supplied to the CEC function unit 209.

  In this way, in the power supply unit 250 shown in FIG. 8, when both the disc player 100 and the television receiver 200 are in the power-on state, the CEC function unit 209 has the + 5V power from the disc player 100 and the standby. Both power supplies are supplied. However, in this case, the CEC function unit 209 may be configured to be supplied with + 5V power or standby power from the disc player 100.

  For example, the other functional unit 253 monitors the voltage of the + 5V power line, and when the voltage of the + 5V power line is + 5V, the connection switch 252 is turned off even when the television receiver 200 is in the power-on state. Configured to control state. In this case, when both the disc player 100 and the television receiver 200 are in the power-on state, only + 5V power from the disc player 100 is supplied to the CEC function unit 209.

  As described above, in the television receiver 200 of the AV system 10 shown in FIG. 1, when the disc player 100 is turned on even in the standby state, the + 5V power supplied from the disc player 100 is supplied. Is supplied to the CEC function unit 209. Thereby, even when the television receiver 200 is in a standby state, the CEC function unit 209 can communicate CEC signals with the disc player 100.

  Thus, the television receiver 200 does not always supply power to the CEC function unit 209 when in the standby state, and can reduce power consumption. Further, in this television receiver 200, since the power is not always supplied to the CEC function unit 209 when in the standby state, the CEC function is turned off at the factory setting, for example, in order to reduce power consumption. There is no need to set it. Therefore, the user need not cancel the setting, and the user's initial setting items can be reduced.

  In the television receiver 200 of the AV system 10 shown in FIG. 1, standby power is supplied to the CEC function unit 209 when the power is turned on. As a result, the CEC function unit 209 can communicate CEC signals with the disc player 100. As described above, the television receiver 200 supplies standby power to the CEC function unit 209 when the power is turned on, and does not always supply power to the CEC function unit 209. Can be reduced.

<2. Modification>
In the above-described embodiment, the television receiver 200 in which the CEC function unit 209 is built in the standby microcomputer 204 is shown. However, the CEC function unit 209 may be built in the HDMI receiving unit 202.

  FIG. 10 shows a configuration example of a main part of a television receiver 200A in which the CEC function unit 209 is built in the HDMI receiving unit 202. 10, parts corresponding to those in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The television receiver 200A includes an HDMI terminal 201, an HDMI receiving unit 202A, a main microcomputer 203, a standby microcomputer 204A, a key input unit 205, and a remote control receiving unit 206. The television receiver 200 includes a main power supply circuit 207, a standby power supply circuit 208, a CEC function unit 209, an EDIDROM 210, an HPD circuit 211, and a pull-up resistor 212.

  The standby microcomputer 204A is configured in the same manner as the standby microcomputer 204 of the television receiver 200 shown in FIG. 7 except that the CEC function unit 209 is not incorporated. That is, the standby microcomputer 204A receives and processes the remote control code by the user's operation by the remote control reception unit 206, and performs the operation process by the operation of the key input unit 205. The standby microcomputer 204A controls the main power supply circuit 207 to turn on the main power when the television receiver 200A receives a power-on remote control signal when the TV receiver 200A is in a standby state or when a power-on operation is performed by key operation. To.

  The HDMI receiving unit 202A is configured in the same manner as the HDMI receiving unit 202 of the television receiver 200 shown in FIG. 7 except that the CEC function unit 209 is incorporated. That is, the HDMI receiving unit 202A receives image data VD, audio data AD, and control data CD transmitted in one direction from the disc player 100 via the TMDS channel of the HDMI cable 300 by communication conforming to HDMI. .

  The HDMI receiving unit 202A includes a CEC function unit 209. The CEC function unit 209 transmits and receives CEC signals to and from the disc player 100 via the CEC line. Even when the CEC function unit 209 receives a command related to power control, the standby microcomputer 204A controls the main power circuit 207 to turn on the main power.

  When the television receiver 200A is in a standby state and the disc player 100 is in a power-on state, the CEC function unit 209 is supplied with + 5V power sent from the disc player 100 through a + 5V power line. The The CEC function unit 209 is supplied with standby power obtained by the standby power circuit 208 when the television receiver 200A is in a power-on state and the disc player 100 is in a standby state.

  The other parts of the television receiver 200A illustrated in FIG. 10 are not described in detail, but are configured in the same manner as the television receiver 200 illustrated in FIG. 7 and operate in the same manner.

  FIG. 11 shows an internal configuration example of the HDMI receiving unit 202A. The HDMI receiving unit 202A includes a CEC function unit 209 and a power supply unit 261 in addition to the HDMI receiving function unit 260. The power supply unit 261 will be described.

  The + 5V power supply line is connected to the CEC function unit 209 via the connection switch 262. The connection switch 262 is supplied with a + 5V power line voltage as an on / off control signal. In this case, the connection switch 262 is turned on when the voltage of the + 5V power supply line becomes + 5V, and is turned off at other times.

  Further, standby power from the standby power supply circuit 208 (see FIG. 10) is supplied to the CEC function unit 209 via the connection switch 263. ON / OFF of the connection switch 263 is controlled according to control data in the control register 264 set by the standby microcomputer 104, for example.

  In this case, when the television receiver 200A is in a standby state, the connection switch 263 is turned off so that standby power is not supplied to the CEC function unit 209. On the other hand, when the television receiver 200A is in a power-on state, the connection switch 263 is turned on so that standby power is supplied to the CEC function unit 209.

  The operation of the power supply unit 261 will be described. When both the disc player 100 (source device) and the television receiver 200A (sink device) are in the standby state, the following occurs. In this case, + 5V power is not sent from the disc player 100 via the + 5V power line. Further, the connection switch 263 is turned off. Therefore, no power is supplied to the CEC function unit 209.

  Further, when the disc player 100 is in the power-on state and the television receiver 200A is in the standby state, the following occurs. In this case, + 5V power is sent from the disc player 100 through the + 5V power line. Therefore, the voltage of the + 5V power supply line becomes + 5V, the connection switch 262 is turned on, and the + 5V power is supplied to the CEC function unit 209. In this case, since the connection switch 263 is turned off, standby power is not supplied to the CEC function unit 209.

  Further, when the disc player 100 is in the standby state and the television receiver 200A is in the power-on state, the following occurs. In this case, + 5V power is not sent from the disc player 100 via the + 5V power line. However, in this case, since the connection switch 263 is turned on, standby power is supplied to the CEC function unit 209.

  Further, when both the disc player 100 and the television receiver 200A are in the power-on state, the following occurs. In this case, + 5V power is sent from the disc player 100 through the + 5V power line. Therefore, the voltage of the + 5V power supply line becomes + 5V, the connection switch 262 is turned on, and the + 5V power is supplied to the CEC function unit 209. In this case, since the connection switch 263 is turned on, standby power is supplied to the CEC function unit 209.

  As described above, in the power supply unit 261 shown in FIG. 11, when both the disc player 100 and the television receiver 200A are in the power-on state, the CEC function unit 209 has the + 5V power from the disc player 100 and the standby. Both power supplies are supplied. However, in this case, the CEC function unit 209 may be configured to be supplied with either + 5V power or standby power from the disc player 100.

  For example, the standby microcomputer 104A monitors the voltage of the power supply line. When the voltage is + 5V, the control register so that the connection switch 252 is turned off even when the television receiver 200 is in the power-on state. The control data in H.264 is set. In this case, when both the disc player 100 and the television receiver 200A are in the power-on state, only + 5V power from the disc player 100 is supplied to the CEC function unit 209.

  In the television receiver 200 </ b> A shown in FIG. 10, even when the disc player 100 is in a power-on state even in the standby state, +5 V power sent from the disc player 100 is supplied to the CEC function unit 209. In the television receiver 200 </ b> A shown in FIG. 10, standby power is supplied to the CEC function unit 209 when the power is turned on. Therefore, the television receiver 200A shown in FIG. 10 can achieve the same effects as those of the television receiver 200 shown in FIG.

  The television receivers 200 and 200A described above are provided with standby microcomputers 204 and 204A for managing the power supply state in addition to the main microcomputer 203. However, the configuration need not necessarily include the main microcomputer 203 and the standby microcomputers 204 and 204A. Only the main microcomputer 203 may be provided, and the main microcomputer 203 may have the functions of the standby microcomputers 204 and 204A for managing the power supply state.

  In the above-described television receivers 200 and 200A, the CEC function unit 209 is built in the standby microcomputer 204 or built in the HDMI receiving unit 202A. However, the CEC function unit 209 may be built in another circuit unit or may be an independent circuit unit.

  In the above description, the example of the AV system 10 using the disc player 100 as the source device and using the television receiver 200 as the sink device is shown. However, the present invention can be similarly applied to a system configured using other source devices and sink devices.

  In the above description, an HDMI standard interface has been described as a transmission path for connecting electronic devices (between a source device and a sink device). However, the present invention can also be applied to other similar transmission standards.

  According to the present invention, power consumption during standby can be reduced and the initial setting items of the user can be reduced. For example, an AV formed by connecting a disc player and a television receiver using an HDMI interface. Applicable to system etc.

1 is a block diagram showing a configuration example of an AV system as an embodiment of the present invention. It is a figure which shows the HDMI connection part of the disc player and television receiver which comprise AV system. It is a figure which shows the structural example of the HDMI transmission part of a disc player, and the HDMI reception part of a television receiver. It is a figure which shows the example of a structure of TMDS transmission data (when the image data of horizontal x length is 1920 pixels x 1080 lines is transmitted). It is a figure which shows the pin arrangement (type A) of the HDMI terminal to which the HDMI cable of the source device and the sink device is connected. FIG. 2 is a block diagram illustrating an exemplary main configuration of a disc player that constitutes an AV system. It is a block diagram which shows the principal part structural example (CEC function part is incorporated in a standby microcomputer) of the television receiver which comprises AV system. It is a figure which shows the structural example of the power supply part which supplies a power supply to the CEC function part in a standby microcomputer. It is a flowchart which shows the control operation | movement of standby power supply to a CEC function part. It is a block diagram which shows the principal part structural example (CEC function part is incorporated in an HDMI receiving part) of the television receiver which comprises AV system. It is a figure which shows the structural example of the power supply part which supplies a power supply to the CEC function part in an HDMI receiving part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... AV system, 100 ... Disc player, 101 ... HDMI terminal, 102 ... HDMI transmission part, 103 ... Main microcomputer, 104 ... Standby microcomputer, 105 ... Key input part , 106: Remote control receiving unit, 107: Main power supply circuit, 108: Standby power supply circuit, 109: CEC function unit, 110: HPD circuit, 111: Pull-down resistor, 200, 200A ... TV receiver, 201 ... HDMI terminal, 202, 202A ... HDMI receiver, 203 ... Main microcomputer, 204, 204A ... Standby microcomputer, 205 ... Key input part, 206 ..Remote control reception unit, 207... Main power supply circuit, 208... Standby power supply circuit, 209... CEC function unit, DESCRIPTION OF SYMBOLS 10 ... EDIDROM, 211 ... HPD circuit, 212 ... Pull-up resistor, 250 ... Power supply unit, 251,252 ... Connection switch, 253 ... Other functional units, 260 HDMI reception function unit, 261, power supply unit, 262, 263, connection switch, 264, control register

Claims (6)

A data receiver for receiving content data from an external device;
A communication unit for communicating a control signal with the external device;
A data receiving apparatus comprising: a power supply unit that supplies power to the communication unit when power is supplied from the external device via a power line during standby. Further provided with a power supply circuit for obtaining a standby power supply,
The data receiving device according to claim 1, wherein the power supply unit supplies, to the communication unit, standby power obtained by the power circuit or power supplied from the external device via a power line when the power is turned on. The data receiving device according to claim 1, wherein the data receiving unit receives the content data from the external device via a transmission path using a plurality of channels and differential signals. The data receiving device according to claim 3, wherein the control signal with which the communication unit communicates is a CEC signal. An information storage unit that holds at least information about its own performance;
The data receiving device according to claim 1, wherein the power supplied from the external device via a power line is a power for the external device to read information held in the information storage unit. A data receiver for receiving content data from an external device;
A power control method in a data receiving device including a communication unit that performs communication of a control signal with the external device,
A power control method for supplying power to the communication unit when power is supplied from the external device via a power line during standby of the data receiving device.

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