JP4730544B2 - Signal reproduction device - Google Patents

Description

  The present invention relates to a signal reproducing apparatus capable of reproducing a signal from a recording medium such as an optical disk.

  In recent years, video playback devices such as optical disc players and the like equipped with digital interfaces such as DVI (Digital Visual Interface) and HDMI (High-Definition Multimedia Interface) have been developed. HDMI is a digital video / audio input / output interface standard mainly developed for AV equipment developed in December 2002, and is a further development of DVI, which is a digital interface used for connecting personal computers and displays. It is.

  If a video playback device such as a disc player and a video display device such as a television receiver are each equipped with HDMI, and the video playback device and the video display device are connected via an HDMI cable, the HDTV played back by the video playback device By supplying the video signal to the video display device, a high-quality video can be displayed on the screen of the video display device (see, for example, Patent Document 1).

In addition to the TMDS signal for transmitting the digital video / audio signal, the signal transmitted / received between the transmission side device and the reception side device via the HDMI cable is used to supply power from the transmission side to the reception side. A 5V power signal, a hot plug signal for detecting connection of the receiving side device, a CEC signal for performing remote control control, and the like are included.
JP 2005-250342 A [G09G5 / 00]

By the way, it is conceivable to construct an AV system in which a plurality of AV devices equipped with a digital interface such as HDMI are connected to a video display device equipped with a digital interface such as HDMI, and various video sources are switched and displayed. It is done.
In this case, there is a method of switching input / output by an HDMI selector having a plurality of input terminals and one output terminal, but there is a problem that the cable connection becomes complicated.

Therefore, an HDMI signal switching circuit is built in one AV device to be connected to the video display device, for example, a video playback device such as a disc player, and another AV device (external device) is connected via the video playback device. Can be considered.
In this connection form, the video playback device is provided with one or more HDMI input terminals, and video and audio signals (internal signals) played back from the recording medium, and video and audio input from an external device via the HDMI input terminal In the normal mode in which the signal (external signal) is switched by the HDMI signal switching circuit and the recording medium is reproduced by the video reproduction device, the internal signal is supplied to the output terminal, and in the standby mode in which the recording medium is not reproduced, Supply an external signal to the output terminal.

  However, in the case of adopting the above connection form, in the video playback device, since it is necessary to supply power to the HDMI signal switching circuit in the standby mode, it is necessary to suppress power consumption as much as possible in the standby mode. There is a problem that the power consumption of the entire apparatus increases due to the power consumption of the HDMI signal switching circuit.

  Accordingly, an object of the present invention is to suppress power consumption in a standby mode of a video playback device in a configuration in which the video playback device is equipped with a digital interface for connecting a video display device and an external device.

  The video reproduction apparatus according to the present invention includes a signal processing circuit (7) for reproducing a signal from a recording medium, and an output terminal (11) for connection to the video display apparatus (2) via a first digital interface cable. ), An input terminal (12) for connection to the external device (3) via the second digital interface cable, and a reproduction signal obtained from the signal processing circuit (7) and the input terminal (12). A signal switching circuit (10) that switches an external signal to be supplied to the output terminal (11), a control circuit (8) that controls the switching operation of the signal switching circuit (10), and the first and second digital interfaces The external device (3) can transmit an external signal to the input terminal (12) via the cable, and the video display device (2) can be connected to receive the signal output from the output terminal (11). Detection circuit (13) for detecting the power supply and supplying power to each circuit And a power supply circuit (9), and when the standby mode in which the power supply from the power supply circuit (9) to the signal processing circuit (7) is to be stopped is set, the connection state is detected by the detection circuit (13). In this case, the power source of the signal switching circuit (10) is turned on. On the other hand, if the detection state is not detected by the detection circuit (13), the power source of the signal switching circuit (10) is turned off.

  According to the video playback device of the present invention, when the standby mode is set, the external device (3) can transmit an external signal to the input terminal (12) and the video display device (2) is connected to the output terminal ( 11) If it is detected whether or not it is in a connection state capable of receiving the reproduction signal output from the device, and the connection state is not detected, for example, a video display device (2) or an external device (3) is connected. If the power of the video display device (2) or the external device (3) is off, the signal switching circuit (10) is turned off. Compared with a configuration in which is turned on, power consumption in the standby mode can be suppressed.

In a specific configuration, when the connection state is detected by the detection circuit (13) in the standby mode, the control circuit (8) sends an external signal from the input terminal (12) to the signal switching circuit (10). Set the switching state to supply to the output terminal (11).
As a result, an external signal obtained from the external device (3) passes through the signal switching circuit (10) of the video reproduction device (1) and is supplied to the video display device (2) to display video and output audio. Will be.

  According to the video playback device of the present invention, power consumption in the standby mode can be suppressed in a configuration equipped with a digital interface for connecting the video display device and an external device.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, the video reproduction apparatus (1) according to the present invention comprises an HDMI output terminal (11) and an input terminal (12), and the output terminal (11) is connected via an HDMI cable (4). The video display device (2) can be connected to the input terminal (12), and the external device (3) can be connected to the input terminal (12) via the HDMI cable (5).

The video display device (2) is, for example, a television receiver, and has an HDMI input terminal (21) for connecting an HDMI cable (4), and an input signal from the input terminal (21) is received. In response, it displays video and outputs audio.
On the other hand, the external device (3) is a tuner for receiving a digital broadcast, for example, and includes an HDMI output terminal (31) for connecting the HDMI cable (5), and an image is output from the output terminal (31). -Outputs audio signals (hereinafter referred to as external signals).

  The video playback device (1) is equipped with a playback drive mechanism (6) for reading a signal from an optical disk on which a compressed and encoded video / audio signal is recorded, and is read out by the playback drive mechanism (6). The video / audio signal is supplied to a signal processing circuit (7), subjected to decoding processing, separated into a video signal and an audio signal, and encoded into a TMDS signal based on the HDMI format. (Hereinafter referred to as a reproduction signal) is supplied to the signal switching circuit (10).

The video playback device (1) also has a signal switching circuit (switched between a playback signal obtained from the signal processing circuit (7) and an external signal input from the input terminal (12) and supplied to the output terminal (11). 10), and the switching operation of the signal switching circuit (10) is controlled by a control circuit (8) comprising a microcomputer.
The video playback device (1) is equipped with a detection circuit (13) for detecting the connection state between the video display device (2) and the external device (3), and the video display device (2) is connected. The hot plug signal obtained from the output terminal (11) in the state of being connected and the 5V power signal obtained from the input terminal (12) in the state of being connected to the external device (3) are supplied to the detection circuit (13). The Then, the detection signal of the detection circuit (13) is supplied to the control circuit (8).

  Furthermore, the video playback device (1) includes a playback drive mechanism (6), a signal processing circuit (7), a signal switching circuit (10), a control circuit (8), and a power supply circuit for supplying power to the detection circuit (13). (9) is provided, and the power supply state from the power supply circuit (9) to each circuit is switched according to the normal reproduction mode for reproducing the disk and the standby mode for stopping the reproduction of the disk.

FIG. 2 shows the processing (power-off processing) of the control circuit (8) when the main power source of the video playback device (1) is turned off and the standby mode is set.
First, in step S1, it is determined whether or not the power key is pressed. If it is determined that the answer is yes, it is determined in step S2 whether or not a 5V power signal is detected.

If the external device (3) is connected and it is determined YES in step S2, the process proceeds to step S3, and it is further determined whether or not a hot plug signal is detected.
When the external device (3) is not connected and it is determined NO in step S2, or when the video display device (2) is not connected and it is determined NO in step S3, step After shifting to S4 and turning off the circuit power supplies other than the detection circuit (13) and the control circuit (8), the process returns to step S2 to repeat detection of the 5V power signal and the hot plug signal.

  On the other hand, when the external device (3) and the video display device (2) are connected and it is determined YES in step S3, the process proceeds to step S5, where the signal switching circuit (10) is switched and the input terminal ( 12) The video / audio signal (external signal) from 12) is output to the output terminal (11), and in step S6, the circuit power supply other than the signal switching circuit (10), the detection circuit (13) and the control circuit (8). After turning OFF, the process returns to step S2 to repeat detection of the 5V power signal and the hot plug signal.

FIG. 3 shows the processing of the control circuit (8) when the main power supply of the video playback device (1) is turned on (processing at power-on).
First, in step S11, it is determined whether setting of the disc playback mode is instructed or setting of the external input mode is instructed. When setting of the external input mode is instructed, in step S12, 5V power is set. It is determined whether a signal is detected.

If the external device (3) is connected and it is determined YES in step S12, the process proceeds to step S13, and it is further determined whether or not a hot plug signal is detected.
When the setting of the disc playback mode is instructed, the external device (3) is not connected, and when it is determined NO in step S12, or the video display device (2) is not connected, When it is determined NO in step S13, the process proceeds to step S15, the signal switching circuit (10) is switched, and the video / audio signal (internal signal) from the reproduction drive mechanism (6) is output to the output terminal (11). Output to.

  On the other hand, when the external device (3) and the video display device (2) are connected and it is determined YES in step S13, the process proceeds to step S14, the signal switching circuit (10) is switched and the input terminal ( After the video / audio signal (external signal) from 12) is output to the output terminal (11), the process returns to step S12 to repeat the detection of the 5V power signal and the hot plug signal.

  According to the video playback device (1), when the standby mode is set, when the external device (3) and the video display device (2) are respectively connected and powered on, the signal switching circuit ( 10) The power supply of 10) is turned on, and an operation for supplying an external signal from the external device (3) to the video display device (2) through the video playback device (1) is performed. When (3) is not connected, or when the video display device (2) or the external device (3) is turned off, the signal switching circuit (10) is turned off and the signal switching circuit ( The wasteful power consumption due to 10) is avoided, and the power consumption in the standby mode is minimized.

It is a block diagram which shows the structure of the state which connected the video display apparatus and the external apparatus to the video reproduction apparatus which concerns on this invention. It is a flowchart showing a power-off process. It is a flowchart showing the process at the time of power-on.

Explanation of symbols

(1) Video playback device
(2) Video display device
(3) External equipment
(4) HDMI cable
(5) HDMI cable
(6) Playback drive mechanism
(7) Signal processing circuit
(8) Control circuit
(9) Power circuit
(10) Signal switching circuit

Claims (5)

A signal reproduction device that can be connected to an image display device (2) using a first digital interface cable and can be connected to an external device (3) using a second digital interface cable,
A signal processing circuit (7) for reproducing a signal from the recording medium, an output terminal (11) for connection to the video display device (2) via the first digital interface cable, and a second digital interface cable The input terminal (12) for connecting to the external device (3) via the input terminal, and switching between the reproduction signal obtained from the signal processing circuit (7) and the external signal input from the input terminal (12) are switched to the output terminal ( 11) the signal switching circuit (10) to be supplied to the control circuit (8) for controlling the switching operation of the signal switching circuit (10) and the external device (3) via the first and second digital interface cables. A detection circuit (13) for detecting that the external signal can be transmitted to the input terminal (12) and the video display device (2) is in a connection state capable of receiving a signal output from the output terminal (11); And a power supply circuit (9) for supplying power to each circuit. When the standby state in which the supply of power from the path (9) to the signal processing circuit (7) is to be stopped is set, when the connection state is detected by the detection circuit (13), the signal switching circuit (10 ), While the connection state is not detected by the detection circuit (13), the signal switching circuit (10) is turned off.   When the connection state is detected by the detection circuit (13) in the standby mode, the control circuit (8) sends an external signal from the input terminal (12) to the output terminal (11) to the signal switching circuit (10). 2. The signal reproducing apparatus according to claim 1, wherein a switching state to be supplied to the first is set.   When the signal reproduction mode for reproducing the signal from the recording medium is set, the control circuit (8) sends the reproduction signal from the signal processing circuit (7) to the output terminal (11) with respect to the signal switching circuit (10). When the external input mode that receives the external signal from the external device (3) is set while the switching state to be supplied is set, the external signal from the input terminal (12) is sent to the signal switching circuit (10). The signal reproducing apparatus according to claim 1 or 2, wherein a switching state to be supplied to the output terminal (11) is set. The signal reproducing apparatus according to any one of claims 1 to 3, wherein the first digital interface cable and the second digital interface cable are cables having the same standard. The signal reproducing apparatus according to claim 4, wherein each of the first digital interface cable and the second digital interface cable is an HDMI cable.

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