JP2605025B2 - Display control circuit - Google Patents

Description

DETAILED DESCRIPTION [Summary] Videophones and the like require a dedicated display device, and it is difficult to reduce the cost.

According to the present invention, the display means of another device is shared, the display means of the other device is operated during the operation of the videophone, and a display signal of the videophone is added to the display means for display. As a result, an inexpensive videophone or the like with excellent operability can be obtained.

[Industrial applications]

The present invention relates to a display device, and more particularly to a display control device for displaying on a display device of another device.

(Conventional technology)

Telephones are devices that can talk to distant people, but have the problem that the expression of the speaker is not transmitted because they are just conversations. In order to convey the expression of the speaker, a videophone for displaying the expression of the speaker on the telephone has been developed and put to practical use. Similarly, a television interphone for displaying a visitor as an intercom has been put to practical use.

The above-mentioned videophones and video intercoms require a display device and an image pickup device as compared with conventional telephones and intercoms, so that they are inevitably expensive.

In order to reduce the cost, videophones, video intercoms, and the like that share a display portion of a television receiver have been developed.

This videophone or video intercom is provided with a video input terminal on a display section of the video receiver, for example, when a videophone call is received, a video signal of the videophone is applied to the video input terminal, and the videophone terminal is displayed on the display section of the video receiver. Is output.

According to such a method, it is not necessary to provide a dedicated display device for the videophone or the intercom, so that an inexpensive device can be provided.

[Problems to be solved by the invention]

In the above-described method, for example, a switch for switching a video signal of a television receiver to a video signal of a videophone is required. Then, for example, when a videophone call is received, the receiver must operate the changeover switch to switch the video signal.

Also, when the power of the television receiver is turned off, the display unit of the television receiver is of course not operating, so that the power of the television receiver must be turned on.

As described above, in a videophone or the like, providing a dedicated display device is expensive, and when a display unit is shared with a television receiver or the like, there is a problem that operability at the time of use is poor and it is difficult to use.

An object of the present invention is to provide a display control device which is inexpensive as a system and further improved in operability in view of the above-mentioned conventional disadvantages.

[Means for solving the problem]

 The configuration of the present invention is as described below.

The present invention relates to a display control device connected to a telephone and a display device for controlling display and power of the display device, wherein the operation detecting means 1 detects off-hook or on-hook of the telephone, and the off-hook of the telephone is detected by the operation detecting means 1. Is detected, the power of the display device is turned on. When the operation detecting means 1 detects the on-hook, the power of the display device is turned on only when the power of the display device is not turned on when the off-hook is detected. Power control means 2 for disconnecting
A display control for changing the display of the display device to a display screen relating to the telephone when the off-hook of the telephone is detected by the operation detecting means 1 and terminating the display screen relating to the telephone when detecting an on-hook. Means 3.

The display device is, for example, a television receiver.

[Action]

According to the present invention, the operation detecting means 1 detects the off-hook operation of the telephone by the user at the time of starting the use of the videophone with the above-described configuration. The detection result by the operation detecting means 1 is applied to the power control means 2 and the display device means 3.

When the operation detecting means 1 detects the off-hook operation, the power control means 2 controls the power so that the power of the display device is turned on. The display control means 3 changes the display of the display device to a display screen related to the telephone.

At the end of the use of the videophone, the operation detecting means 1 detects the on-hook operation of the telephone by the user.

When the operation detecting unit 1 detects the on-hook operation, the power control unit 2 turns off the power of the display device only when the power of the display device is off before the start of use. Further, the display control means 3 causes the display on the display device to end the display screen related to the telephone.

For example, when the display device is a video receiver and a video image signal is being displayed before the use of the videophone is started, the user performs off-hook of the telephone so that the display device is displayed on a display screen related to the videophone. Become. Thereafter, at the end of the use of the videophone, the user turns the telephone on-hook, and the display device becomes a display screen related to the video signal. At this time, the power is controlled so that the power of the display device is not turned off.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings.

 FIG. 2 is a circuit diagram of an embodiment of the present invention.

The channel selection demodulation circuit 30, the audio amplifier 4, the speaker 5, and the display device 6 constitute, for example, a television receiver. The receiving antenna 13 is a television antenna, which receives a radio wave of the television and adds a channel selection demodulation circuit 30 thereto. The channel selection demodulation circuit 30 is a circuit that selects a target radio wave, detects and outputs a video signal and an audio signal. Only the target television signal of the received waves applied to the tuning and demodulation circuit 30 is selected by the tuner 31 and applied to the intermediate frequency processing circuit 32. The television signal selected by the intermediate frequency processing circuit 32 is amplified, separated into a signal having audio information and a signal having video information, and applied to the audio signal processing circuit 33 and the video detection circuit 34, respectively.

The audio signal processing circuit 33 is a circuit that detects a signal having audio information and converts the signal into an audio signal. Then, the audio signal of the television signal of the selected circuit is amplified by the audio amplifier 4 and output as audio from the speaker. On the other hand, the signal having the video information is applied to the video detection circuit 34 and is detected to be a video signal.

When the videophone is not operating, the switch unit 11 selects the video signal output from the channel selection demodulation circuit 30, and the video signal is output to the display device 6 via the switch unit 11.

The display device 6 is, for example, a display device such as a CRT, and a video signal is applied to a video / color signal processing circuit 61 and a synchronization signal processing / deflection circuit 62 of the device.

The video / color signal processing circuit 61 is composed of a YC separation circuit 611, a video amplification circuit 612, a color signal processing circuit 613, and a color output circuit 614, and these circuits become R, G, B video signals and are CRT. It is applied to the electrodes of the picture tube 63. Synchronous signal processing
The deflection circuit 62 has a synchronization separation circuit 621, a vertical deflection circuit 622, a horizontal deflection circuit 623, and a high voltage generation circuit 624.
And a high voltage is generated, and the picture tube 63 is operated.

The television receiver naturally has the power supply 65. For example, the power supply is off when the television receiver is not operating.

On the other hand, when a call is received on the videophone line or when a call is to be made to another videophone, the operator (caller or receiver) picks up the handset 71 of the telephone 7 (off-hook). The control circuit 8 is a circuit for detecting that the handset has been picked up, and the detection result, that is, the power supply 65 of the television receiver and the power supply 10
The signal for operating is output. Further, it outputs a control signal for switching the switch unit 11.

As described above, when the videophone is not operating, the switch unit 11 selects the video signal of the tuning / demodulation circuit 30, but picks up the handset 71 of the telephone 7 (off-hook).
At times, the switch unit 11 selects a video signal of a codec (CODEC) 12 according to a control signal of the control circuit 8.

Although not shown, the codec (CODEC) 12 is connected to a line via a digital service unit (DSU), for example. The codec is a device or circuit that decodes a coded video signal (video telephone signal) applied from the line to reproduce the video signal, and encodes the video signal applied from the camera 9 and outputs the coded video signal to the line as a video telephone signal.

When the switch unit 11 selects the video signal of the codec 12 by detecting the off-hook of the handset 71 of the control circuit 8, the video signal of the videophone signal is added to the display device 6, and the display device 6 receives the videophone signal. Display video signal. In other words, at this time, the display device 6 of the video receiver becomes the display device of the videophone.

The control circuit 8 operates the switch unit 11 and the codec 12
When the video signal is selected, the power supply 65 and the power supply 10 of the display device are operated. Therefore, for example, even when the video receiver is not operating, when a videophone call is received, the power is automatically turned on, the video receiver operates, and the display on the videophone is performed.

FIG. 3 is a configuration diagram of the control circuit. The control circuit in FIG. 3 has a state signal sensing / determining unit 82 composed of a microprocessor 81, a switch control unit 83, and a power supply (monitor unit, camera unit) control unit 84. For example, a state signal indicating that the handset 71 has been taken off-hook by picking up the handset 71.
It is added to a state signal sensing / determining section 82 of 81. The state signal sensing determination unit 82 is a circuit that detects the off-hook state from the switch information and the like. That is, it detects that the videophone should operate.

In the embodiment of the present invention, the codec 12 is connected to the telephone 7 as shown in FIG. However, in the case of a videophone, a conversation may be performed using a speaker and a microphone without using the telephone. In such a case, the above-mentioned status signal is a switch signal or the like operated when making or receiving a videophone call. Because there are these various states,
The state signal sensing / judgment unit 82 detects the state in which the videophone should operate on the line by various methods.

When the state to be operated is detected by the state signal sensing / determining section 82, a control signal for switching a switch is output to the switch control section 83, and the power supply 65 of the display device 6 and the camera 9 A control signal for turning on the power supply 10 is output. When a control signal for switching this switch is added, the switch control unit 83 switches the switch driving unit.
By driving 111, the switch 11 is operated 112. In addition, the power supply control unit 84 controls the power supply 10,
The power of 65 is turned on 113. The power is turned on by, for example, turning on AC 100 V by a relay or the like, or by applying a signal to be operated to a control terminal of a power supply having a specific control input.

FIG. 4 is a processing configuration diagram of the above-described microprocessor. The microprocessor 81 performs various processes sequentially. For example, when judging the status signal, the microprocessor 81 reads out the “judgment of status signal” JOB of the job number 5 from the memory (ROM) via the system controller and executes the processing. For example, when a videophone should be operated, JOB number 2 "Videophone signal connection" JOB, then
The job of "monitor power ON" of job number 3 is executed. this
By executing the JOB, the display device 6 of the video receiver as a display unit of the videophone starts operating.

Also, while the videophone is operating, the microprocessor 81 performs the job of “judgment of the status signal”, and when detecting that the operation of the videophone is finished, the job of “broadcast TV signal connection” and the job of “monitor” are performed. Execute the "Power OFF" JOB. When the television receiver is operating before operating as a videophone, the power supply 65 is operated by other circuits and switches (not shown). At this time, even if the control circuit 8 performs the OFF operation processing, The power does not turn off.

As described above, the present invention has been described in detail with reference to the embodiments of the present invention. However, the present invention is not limited to videophones, and can be similarly applied to, for example, video intercoms and other devices that share a display device. .

Further, in the present embodiment, an example is shown in which a digital line that is currently being used by companies and the like is used, but the form (moving image, quasi-moving image, still image) displayed on the display unit of the videophone and the accompanying usage are used. The type of line to be used is not specified, including whether it is digital or analog, and the present invention can be implemented in all cases.

However, since the video signal needs to be in a new combined form suitable for the transmission path, some video transmission device or circuit instead of the codec is interposed.

[Effect of the Invention] As described above, the present invention turns on the operation of the shared display device when the operation is started in a videophone, a video intercom, or the like, and switches the display signal to display the video signal and the video signal. According to the present invention, it is possible to obtain a display control device which is inexpensive as a system and further improved in operability.

[Brief description of the drawings]

 1 is a block diagram of the present invention, FIG. 2 is a circuit configuration diagram of an embodiment of the present invention, FIG. 3 is a configuration diagram of a control circuit, and FIG. 4 is a processing configuration diagram of a microprocessor. 1 ... operation detecting means, 2 ... switching means, 3 ... power-on means, A, B ... video signal.

Claims (2)

(57) [Claims] 1. A display control device connected to a telephone and a display device for controlling display and power of the display device, comprising: operation detecting means for detecting off-hook or on-hook of the telephone; When the detection is detected, the power of the display device is turned on, and when the operation detecting means detects the on-hook, the power of the display device is turned off only when the power of the display device is not turned on when the off-hook is detected. A power source control unit, and a signal source for outputting display screen information related to the telephone to the display device when the off-hook of the telephone is detected by the operation detecting unit. Display control means for connecting a signal source that outputs information other than display screen information related to the telephone to the display device in place of a source. A display control device. 2. The display control device according to claim 1, wherein said display device is a television receiver.