KR19990043343A - Automatic screen changer for composite television for video telephone - Google Patents

Abstract

The present invention relates to a composite television that also serves as a monitor for a video telephone. In a television having a monitor function of a video telephone, an invention has been proposed in which a user picks up a handset of a video telephone and switches the telephone on to switch the mode of the television to the video telephone monitor mode automatically by sensing the on switching signal.

When the output signal of the video processor of the other party's video telephone is received through the video telephone, the user switches the handset on and off. The reception image signal of the other party is applied to the video output section of the television via the video processing section of the telephone. The microcomputer of the television receives the on-switching signal of the handset and applies a control signal to the video output unit of the television to switch the television to the telephone monitor.

Description

Automatic screen changer for composite television for video telephone

The present invention relates to a lower surface automatic switching device of a composite television for a video telephone. In multi-television televisions that can be used with monitors of video telephones, the user can switch on the handset of the telephone and switch the display of the television to the monitor of the video telephone. switching apparatus for television having a function of video telephone).

As shown in FIG. 1, a video telephone is used to perform handset while viewing an image of a counterpart transmitted through a telephone line by using a dedicated device including a camera, a monitor, and a handset.

The video telephone has an encoder for compressing an image of a caller photographed by a camera at a transmitter side into a signal suitable for transmission over a telephone line, and at the receiver side, a decoder for receiving an encoded image signal and restoring it to an original image signal. It should be provided. Since telephones must be able to transmit and receive, one set of videophones should be equipped with both an encoder and a decoder. As a method of encoding and decoding image signals, MPEG encoders and MPEG decoders are generally used.

However, according to the recent diversification of the functions of the television and the integration of related devices, it is being developed that some components of the television can be used for video phones. In particular, a technique is being studied in which a video telephone unit is integrally formed on a television or a separate video telephone set top is connected to a television so that the water tube of the television can also be used as a monitor of a video telephone.

However, in a composite television that can be used as a monitor for a videophone as described above, the user turns on the handset to make a video call or to make a phone call. In this case, the user must first turn on the television and then switch the displayed television broadcast to monitor mode in order to display the image of the other party transmitted to the videophone. There is a problem that needs to be switched.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem of a composite television for a videophone. The object of the present invention is to switch the handset of a television when the user switches on the handset. It is to provide a device for automatically switching the screen to the video phone screen mode.

1 is an explanatory diagram of a general video telephone.

2 is a block diagram of an embodiment of the invention.

3 is a flowchart illustrating the operation of an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1 antenna 2 tuner part

3: Tuning device 4: IF detector

5: P / S separator 6: voice signal processor

7: voice amplifier 8: speaker

9: Image signal processing unit 10: Image output unit

11: CRT 12: Micom

13 image processor 14 voice processor

15: microphone 16: telephone speaker

17: signal detector 18: tone generator

20: video phone book 100: camera

200: monitor 300: handset

400: keypad

Hereinafter will be described in detail with reference to the accompanying drawings for the configuration and operation of the embodiment suitable for achieving the object of the present invention.

2 is a block diagram of an embodiment of the present invention of a composite television for a videophone.

Antenna 1 for receiving a composite video signal transmitted from a broadcasting station, amplifying the composite video signal of a plurality of broadcasting stations received from the antenna 1 to perform high frequency processing, and broadcasting to be watched according to the operation of the tuner 3. A tuner section 2 for tuning channels, an IF detector section 4 for detecting and amplifying intermediate frequencies in the composite video signal applied from the tuner section 2, and an IF detector section 4 for application from the IF detector section 4 The P / S separation unit 5 which separates and outputs the audio signal and the composite signal from the composite video signal, and removes the residual color components from the applied audio signal separated from the P / S separation unit 5 to perform audio processing. From the voice signal processor 6, the voice amplifier 7 for power amplification and output to the speaker 8 by receiving the output signal from the voice signal processor 6, and the P / S separator 5 The luminance signal (Y) and the color signal (C) are separated from the applied image signal. The video signal processor 9, the telephone video signal received from the video telephone unit 30, the switching unit 10 for switching the output video signal of the video signal processor 9, and the above switching. According to an application signal from a receiver which receives a control signal of an external device such as an image output unit 11 and a remote controller not shown in color by processing the image signal applied from the unit 10 and outputting it to the CRT 12. A television composed of a microcomputer 13 which controls the tuning device 3 and applies a control signal to the IF detector 4, the P / S separation unit 5, the switching unit 10 and the power supply unit 14,

An image processing unit 15 for decoding the encoded video signal of the other party received through the telephone line, processing the signal into a signal suitable for display on the CRT 11 of the television, and outputting the signal to the switching unit 10 of the television; And a voice processing unit 16 for outputting a voice signal through the telephone speaker 18 and processing a voice of the user input through the microphone 17 as a signal suitable for transmission to the other party, and detecting a call signal when a telephone call is received. A signal detector 19 for applying a detection signal to the microcomputer 13 of the television;

When the user wants to make a call to the other party, the video telephone unit 30 includes a tone generator 20 for inputting a telephone number.

Hereinafter will be described the operation of the embodiment of the present invention described above. When the user of the television is watching a television broadcast received from the antenna 1 or the power of the television is turned off, the operation of the present invention will be described with respect to a case where a telephone is received through a video telephone from the outside.

If the telephone is called from the other party when the above-mentioned television is in operation or the television is off, and the user switches the handset on,

The telephone signal detected by the signal detection unit 19 is applied to the microcomputer 13 of the television. At this time, when the television is turned off, the microcomputer 13 applies a control signal to the power supply unit 14 to turn on the television. In addition, the microcomputer 13 applies a screen switching control signal to the switching unit 10 in response to the signal applied from the signal detection unit 19.

The encoded video signal received through the telephone line is received by the image processor 15 and restored to the original image signal by the decoder. The decoded video signal is processed into a signal suitable for display on the CRT 12 of the television and applied to the switching unit 10. On the other hand, the switching unit 10 receives the screen switching control signal from the microcomputer 13 cuts off the television output signal of the video signal processing unit 9, the image processing unit 15 of the video telephone unit 30 Switch so that the video signal applied from is displayed.

The voice signal received from the telephone line is signal-processed and amplified by the voice processor 16 and output through the telephone speaker 18. The microphone 17 is used when the user transmits a voice signal when talking to the other party. Although not shown a camera for transmitting the user's image to the other party, the video signal photographed by the camera is input to the image processing unit 15 and is transmitted to the other party's telephone through the telephone line in the encoded state.

3 is a flowchart illustrating an embodiment of a screen automatic switching device of a composite television for a video telephone.

A telephone on switching step (S100) of switching on and off the handset of the telephone by a user intending to use a video telephone;

A television power on determination step (S200) for judging whether the television is powered on in response to the signal received by the telephone on switching step (S100);

A television power on step (S300) for switching the power of the television on when it is determined that the power is turned off in the television power on determination step (S200);

A screen switching signal input step (S400) for switching the screen of the television to a video telephone reception screen when it is determined in the television power-on determination step (S200) that the power is turned on;

A monitor on step (S500) for performing a monitor to block the current TV signal output and display a video telephone image when a signal is input in the screen change signal input step (S400);

A video telephone image display step (S600) of displaying the received image of the video telephone on the CRT 12 of the television switched to the video telephone monitor by the monitor on step (S500);

A telephone off determination step (S700) of determining whether the user has switched off the handset while the video telephone image display step (S600) is performed;

If it is determined in the above telephone off discrimination step S700 that the telephone is not turned off, the routine returns to the above monitor on step S500 to execute a routine.

If it is determined that the telephone off signal is input in the telephone off determination step (S700), the monitor off step (S800) for turning off the video telephone monitor;

In the monitor off step (S800), the monitor displaying the received image of the video telephone is turned off, and the television image display step (S900) is performed to switch to display the television image.

The television power-on step (S300) is switched on by the control of the microcomputer (13) which has received the telephone detection signal from the signal detection unit (19) of the video telephone unit (30).

The monitor-on step (S500) receives the telephone detection signal of the signal detector 19 in the microcomputer 13 and outputs the output signal of the video signal processor 9 of the television and the output signal of the video processor 15 of the telephone. The control signal is applied to the applied switching unit 10 so as to cut off the television signal.

As described above, in the television having the monitor function of a video telephone, when the user turns on the telephone by picking up the handset of the video telephone, it detects the on switching signal and automatically turns on the mode of the television to the video telephone monitor mode. When the output signal of the video processor of the other party's video telephone is received through the video telephone, the user switches the handset on, and the video signal of the television is output through the video processor of the telephone. The microcomputer of the television receives the on switching signal of the handset and applies a control signal to the video output unit of the television to automatically switch the television to the telephone monitor.

Claims (3)

A complex television system in which a water tube of a television can be used as a monitor of a video telephone, comprising: signal detecting means for detecting a handset on switching signal and a radio wave transmission / reception signal of the video telephone; Power switching means for switching on the power of the television when the power of the television is turned off by receiving the detection signal from the signal detecting means; Control means for receiving a television video signal and a video signal of a video telephone and controlling the operation of the power switching means; And a video telephone on-switching device including a video telephone on-switching means for receiving a video signal of a video telephone and a video signal of the video telephone and switching to output a video signal of the video telephone by a control signal outputted from the control means. . The television control microcomputer (13) according to claim 1, wherein said control means controls the operations of the television tuning device (3), the IF detector (4), the P / S separation unit (5), and the switching unit (10). Screen automatic switching device for a composite television for a video telephone. The apparatus according to claim 1, further comprising a video telephone off-switching means for switching off the video signal output of the video telephone and switching to output the video signal of the television by the control of the control means when the off signal of the video telephone is detected. Automatic screen switching device for composite television for telephone.