JPH0289483A - Telephone terminal set - Google Patents

Abstract

PURPOSE:To avoid a fault of reception of a video image sent from an opposite set by turning on a power supply section automatically if the power supply section detecting a voice signal, video signal switching signal is turned off, applying video signal reception processing and displaying the result on a video display section. CONSTITUTION:When the operation is started, a controller 20 checks whether or not a power supply operation button 18 is depressed, As a result, when the button 18 is depressed, the power supply section 17 is turned on. If no button is depressed and a voice signal, video signal switching signal is detected, whether or not the power supply section 17 is turned on is checked. When the power supply section 17 is turned off, the power supply section 17 is immediately turned on, the received video signal is brought into the display enable state and the voice signal, video signal changeover switch 7 is thrown to the position of video image, and the video signal subject to video signal demodulation 12 is stored in a video memory 14 and it is displayed on the video display section. When the power operating button 18 is depressed, the power supply section 17 is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a telephone terminal device, such as a video telephone, which transmits and receives video and audio through a telephone line.

2. Description of the Related Art Conventionally, there have been video telephones, for example, which transmit and receive audio and video through telephone lines, and in recent years this type of device has been attracting attention as the amount of information has increased.

A video telephone, which is an example of a conventional telephone terminal device, will be described below.

The configuration of a conventional video telephone is, for example, as shown in FIG.

In the figure, 1 is a video input section composed of a CCD (charge-coupled device), an image pickup tube, etc., 2 is a video display section composed of a CRT (cathode ray tube), a liquid crystal display panel, etc., 3 is the main body of the device, and 4 is a video an image sending button that is operated when sending the image captured by the input unit 1 to the other party via the telephone line;
Reference numeral 18 denotes a power operation button for turning on and off the power of the video communication section 16, which will be described later. FIG. 4 is a block diagram showing a specific circuit configuration of the conventional example. In the figure, 5 is a telephone line, 6 is a line interface section, and 7 is a voice side (A) indicating the flow of signals arriving through the telephone line. An audio signal/video signal changeover switch that switches to the video side (B), and 8 is a signal sent from the other party via the telephone line when the audio signal/video signal changeover switch is connected to the audio side (A). This is a video signal discriminator that detects whether or not there is a video signal in the video signal, and when there is a video signal, it sends out a video signal detection signal indicating that. 9 is an audio output section such as a speaker, 10 is an audio input section such as a microphone, 11 is a video signal modulation section that modulates the video signal taken in by the video input section 1 into a signal that can be transmitted over a telephone line, and 12 is an audio input section such as a microphone. A video signal demodulation unit demodulates a modulated video signal sent via a telephone line; 13 and 14 are a first video memory and a second video memory, respectively; 15 is the audio output unit 9 and the audio input 16 is a video communication section comprised of the video signal modulation section 11, the video signal demodulation section 12, the first video memory 13, and the second video memory 14, and 17 is the This is a power supply unit that supplies power to the video communication unit 16. Reference numeral 19 denotes a control means, which is composed of a microcomputer, and controls the operations of the audio signal/video signal changeover switch 7 and the video communication section 16 described above. That is, when the image sending button 4 is operated, it is recognized and the audio signal/video signal changeover switch 7 is controlled to be switched from the audio side (A) to the video side (B), and the video signal discrimination is performed. When the unit 8 outputs that a video signal has been detected, control is performed to switch the audio signal/video signal changeover switch 7 from the audio side (A) to the video side (B).

Next, the operation of the video telephone configured as described above will be explained. In addition, in the following explanation, telephone line 5
It is assumed that a plurality of video telephones having the configuration shown in FIG. 3 are connected via the terminal.

First, in the initial state, the power supply section I7 is off, and the audio signal/video signal changeover switch 7 is connected to the audio side (A). When a call is made or received in this state, the calling party and the called party are connected via the telephone line, and then normal voice communication is performed between them by the voice output section 9 and the voice input section IO. .

If you want to send a video to the other party, press the power operation button 18 to turn on the power supply section 17 to make the video communication section 16 operational, and then press the video sending button 4 to turn on the control means 19. controls the audio signal/video signal changeover switch 7 to change the signal flow to the audio side (A
) to the video side (B), and the video I/N information taken into the first video memory 13 by the video input section 1 is modulated by the video signal modulation section 11 into a signal that can be transmitted over a telephone line. The modulated video signal is then sent to the other party via the telephone line 5 from the line interface unit 6 with a signal for audio/video switching added to the beginning. And the other party's phone9.゛When the audio/video switching signal is detected by the video signal discriminator 8 of the telephone terminal device in the non-M device, an output indicating this is input to the control means, and the control means controls the audio signal/video signal changeover switch. 7 to change the signal flow from the audio side (A) to the video side (
B), the video signal is demodulated by the video signal demodulation section 12, stored in the second video memory 14, and displayed on the video display section 2.

After the video transmission is completed, the control means 19 returns the audio signal/video signal changeover switch 7 to the audio side (A).

On the other hand, when the other party transmits a video, if the power supply unit 17 is on, the same process as described above is performed, and the received video is displayed on the video display unit 2 on the user's side.

Problems that the invention attempts to solve By the way, the above-mentioned video telephones are not yet widely used in general households, and therefore it is difficult to constantly supply power to the video communication section 16, which consumes relatively large amounts of power. Leaving it on is a waste of electricity.

Therefore, the power supply section 17 that supplies power to the video communication section 16 is normally kept off, but is configured so that it can be turned on manually when necessary.

However, if the operator forgets to turn on this power and a video signal is sent from the other party in this state, there is a problem that the video signal reception processing is not performed and the video cannot be displayed. Ta.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a function to automatically turn on the power supply section by the video signal detection signal of the video signal determination section even if the power supply section is not turned on by the power operation button. Added.

Function: Even if a video signal is sent from the other party when the power is not turned on, this function allows the video signal to be received, demodulated, and displayed on the video display section.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the circuit configuration of a video telephone according to an embodiment of the present invention. In this embodiment, components having the same configuration as the conventional one are given the same numbers as the conventional one, and the explanation thereof will be omitted.

The difference from the conventional configuration is the control operation by the control means 20, which is composed of a microcomputer, and in addition to the operation control performed by the control means 19 in the conventional example, a video signal discriminator It also performs control to forcibly turn on the power supply unit 17 using the video signal detection signal from 8.

The operation of the video telephone of this embodiment configured as described above will be explained below with reference to the flowchart shown in FIG.

First, when the operation is started, the control means 20 checks whether the power operation button 18 has been pressed (step a), and if it has been pressed, turns on the power supply section 17 (step b). If it is not pressed, proceed to step C, and if an audio signal/video signal switching signal is detected, check whether the power supply unit 17 is already on (step d). If it is off, immediately turn it on (step d). After performing step e>, the received video signal can be displayed, and then the audio signal/video signal changeover switch 7 is switched to the video side (B), and the video signal demodulated by the video signal demodulator 12 is transferred to the second video memory 14. It performs video signal reception processing to store it in the video display section 2 and display it on the video display section 2 (step f). It is checked again whether the power operation button 18 is pressed (step g), and if it is pressed, the power supply section 17 is turned off. Then step h) ends the operation, and if not pressed, proceeds to step a and continues the series of operations.

Effects of the Invention As described above, the present invention checks whether the power supply section is on when an audio signal/video signal switching signal is detected, and if it is off, automatically turns on the power supply section and performs video signal reception processing. Since the video can be displayed on the video display section, it has the effect of eliminating failures in receiving the video transmitted from the other party, which is practically effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of a video telephone, which is a telephone terminal device in an embodiment of the present invention, FIG. 2 is a flowchart showing the operation flow of the embodiment, and FIG. FIG. 4 is a perspective view of a video telephone, which is a terminal device, and is a block diagram showing its circuit configuration. 1...Video input section 2...Video display section 3...Device main body 4...Picture sending button 5...Telephone line 6...Line interface section 7...Audio signal/video signal switching Switch 8...
Video signal discrimination section 9...Audio output section 0...Audio human power section■...Video signal modulation section 2...Video signal demodulation section 3...First video memory 4...Second Video memory 5...Audio communication section 6...Video communication section 7...Power supply section 8...Power operation button 9.20...Control means Name of agent Patent attorney Shigetaka Kurino Haga 1st person Figure diagram

Claims (1)

[Claims] an audio communication section including an audio input section and an audio output section; a video signal discrimination section that discriminates a video signal from a signal arriving on a telephone line; a video input section, a video display section, and a video output from the video input section. a video communication unit including a video signal modulation unit that modulates a signal into a signal that can be transmitted over a telephone line; and a video signal demodulation unit that demodulates a video signal arriving on the telephone line; and a video communication unit that supplies power to the video communication unit. What is claimed is: 1. A telephone terminal device comprising: a power supply section for controlling the power supply section; and a control means for controlling the power supply section to be turned on based on a video detection signal from the video signal discriminating section.