JPH03108980A - Video telephone system - Google Patents

Abstract

PURPOSE:To reproduce a picture on the screen of a television receiver, to select the desired pause of the picture and to transmit it by using the picture memory and the multi-picture display circuit of the television receiver adopting a digital circuit. CONSTITUTION:An input means 9 provided to a picture memory 2 can input a picture signal, which is transmitted from a transmission source through a telephone line 1, to the multi-picture display circuit of the television receiver using the digital circuit. A memory controller 15 outputs the picture signal of a camera inputted to an input switch 6 in the picture memory 10 and outputs a signal to a read circuit. Then, the signal is inputted to a D/A converter 11 and stroboscopic reproducing is executed to the picture on the screen of the television receiver. Afterwards, the designated picture is read out from the picture memory 10 and inputted to a signal converter 5 and the picture signal can be transmitted from a transmitting destination. Thus, the picture can be displayed on the large screen of the television receiver and the desired expression can be freely selected out of the stroboscopically reproduced pictures and transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video telephone device using a television broadcast receiver.

[Conventional technology]

Conventional still image videophones are equipped with a display screen of about 4 to 5 inches, and the screen is frozen based on the timing of the video of your face reflected on the screen, and the still image is stored in the device's built-in memory. let It is generally possible to store about 2 to 3 screens in the memory, and this is a system that selects from the stored still images and sends the still image to the other party, but the memory Because the capacity is small, the number of still images that can be selected is small, and it is difficult to time the still images rather than moving images, making it difficult to capture the facial expression you want.

FIG. 3 is a block diagram showing the configuration of such a conventional still picture video telephone. Telephone line 21 and telephone 22
The modem 24 is connected to a line unit 23, and the line unit 23 controls the line by connecting the telephone line 21 to the telephone 22, or connecting the telephone line 21 and the modem 24.

When transmitting an image, the image signal captured by the CCD 29 is
The /D converter 30 converts the signal into a digital signal and stores it in the image memory 26. The image memory 26 is capable of storing image data of about 2 to 3 screens, and the image to be transmitted is displayed on the CRT 28 via the D/A converter 27, and the image to be transmitted is selected. Later, the image data to be transmitted is added to the modem 24, and the image data signal amplitude-phase modulated by the modem 24 is sent to the destination via the line unit 23.

The image data signal transmitted from the called party is received by the line unit 23 from the telephone line 21, and the signal is further input from the line unit 23 to the modem 24. modem 2
The image data signal inputted to 4 is demodulated and sent to the A/D
The demodulated signal input to the converter 25 is input to the A/D converter 25, and is converted into a digital signal and stored in the image memory 2.
6 and is stored.

The digital signal inputted to the image memory 26 is read out, converted to an analog signal by the D/A converter 27, and added to the CRT 28 to display the transmitted image of the called party. After the call is over, the receiver of the telephone 22 can be used to make a normal conversation.

[Problem to be solved by the invention]

The image memory used in conventional videophones had a small memory capacity, making it difficult to capture the desired facial expression, but image memory built into television receivers with large screens using digital circuitry Using
You can play back your own image with a strobe and display it on the large screen of your TV receiver as a multi-screen, and then you can freely select your favorite expression from the strobe-played image and send it to the recipient. The purpose is to

[Means to solve the problem]

As shown in Figure 1, the video signal is input to the video input switch 6.
Y/C built in analog core (1) 7 via
Y, R-Y,
The signals are separated into B-Y signals, each of which is sequentially input to and stored in the image memory 10 via the A/D converter 8, and the image data stored in the image memory 10 is sequentially read out and converted into D/D.
A television broadcasting receiver using a digital circuit that inputs the signals to the matrix circuit built in the analog core (2) via the A converter 11 and converts them into R, G, and B signals to enable multi-screen display. In the image memory 10
The image data transferred through the telephone line 1 is applied to the modem 4 via the line control unit 3, and the image data is demodulated by the modem 4 and applied to the signal converter 5. The image data signal inputted by the converter 5 is converted into a television signal, inputted into the image memory 10 by the input means 9 and stored in the image memory 10, and the image data signal is sent to the D/A converter 11. The video signal from the camera is output to be displayed on the screen of the television broadcast receiver, and the video signal from the camera is sent to the input switch 6.
, the Y/C separation circuit 7 and the A/D converter 8 to the image memory 10, and is stored in the image memory 10, and the D/A converter is input from one branch of the readout circuit. 11 to display a multi-image on the screen of a television broadcasting receiver, and further connect the other branch of the reading circuit to the signal converter 5 to output the image signal from the image memory 10 to the signal converter. 5, and the signal input by the signal converter 5 is transmitted to the TTC.
The image signal is converted into an image signal defined by the standard, and further, the image signal can be transmitted to the telephone line 1 via the modem 4 and the line control unit 3.

Further, when transmitting the image signal to the telephone line vA1, the memory controller 15 provided for the image memory 10 assigns an address to each screen and sends it to the image memory 10.
0, and by displaying a screen display as shown in Figure 2 on the screen of the television receiver, selecting the one of your choice from the displayed screen and specifying the address number, Activate the memory controller 15 to read the screen at the specified address from the image memory 10,
Image data can be input to the signal converter 5 and transmitted.

[Effect]

An input means 9 provided for the image memory 10 shown in FIG. 1 is capable of inputting an image signal from a destination transmitted through a telephone line 1 to a multi-screen display circuit of a television receiver using a digital circuit. The memory controller 15 stores the camera image signal input to the input switch 6 in the image memory 10 by assigning an address to each screen as shown in FIG. By outputting a signal and inputting the signal to the D/A converter 11, an image is played back with a strobe on the screen of the television broadcasting receiver, and by operating the memory controller 15 and specifying an address number, the specified address is displayed. By reading out the screen from the image memory 10 and inputting it to the signal converter 5, the image signal can be transmitted to the destination.

Embodiment C] FIG. 1 is a block diagram of an electric circuit of a main part of a video telephone system showing an embodiment of the present invention. Reference numeral 6 denotes a manual switch, to which a video input signal from a video tape recorder or a television camera is applied, and the input switch 6 switches the signal and inputs the signal to the analog core (1) 7. The analog core (1) 7 uses a small screen video/chroma processing IC, which processes the Y signal (luminance signal), R-Y signal, B-Y signal (
color difference signals) and horizontal and vertical synchronization signals are separated.

The separated synchronization signals are input to a synchronization signal processing circuit 14, and a synchronization signal for creating a child screen is generated and added to the image memory 10. Furthermore, the separated Y signal, RY signal and BY signal are input to the A/D converter 8. The A/D converter 8 inputs the input Y signal, R-
The Y signal and the B-Y signal are converted from analog signals to digital signals, and the Y signal is sent to the other R-
The Y signal and the BY signal are input to the image memory 10 as they are.

16 is a system controller, which includes an input switch 6 and a switch 9.
Control signals are input to the parent/child screen switch 13 to control switching of the input/output signals of the switch, and a control signal is also input to the signal converter 5 to switch between the television signal and T.
It controls the conversion with the image signal specified by the TC standard and the transmission and reception of the image signal, and further controls the memory controller 15 by inputting a control signal to the memory controller 15.

In the case of multi-screen display in normal TV mode, a control signal is applied to the memory controller 15 by operating the system controller 1G, and the image data stored in the image memory 10 is sequentially read out and D/A converted. input to the device 11.

The image memory 10 has a capacity that can store up to 9 images, and in the case of telephone mode, the memory controller 15 can be controlled by operating the system controller 16 and applying a control signal to the memory controller 15. By assigning an address to each screen to be stored and writing it into the image memory IO, and by specifying a readout address with the memory controller 15, the screen at the address is read out,
It can be input to the signal converter 5.

The image memory IO stores the input signal according to a control signal from the memory controller 15, outputs the same signal, and inputs the Y signal, R-Y signal, and B-Y signal to the D/A converter 11. There is. The D/A converter 11 converts the input signal from a digital signal to an analog signal and inputs the signal to the analog core (2) 12. Analog core (2)
12, the input Y is
RGB primary color signals are generated from the RGB signal, the R-Y signal, and the B-Y signal, and the primary color signal is input to the other end of the switch 13 for switching between the main screen and the sub-screen, into which the signal for displaying the main screen is input. A signal is input, and the display signal is switched by the switch 13 and output, and is applied to a video output circuit (not shown) to display an image on a picture tube.

The telephone part is the same as the conventional example, and the telephone line 1, telephone 2, and modem 4 are connected to the line control unit 3, and the line control unit 3 connects the telephone line l and the telephone 411i2, and the telephone line 1 and modem 4. Furthermore, a modem 4 and a signal converter 5 are connected,
One end of the signal converter 5 is connected to a switch 9, and the other end of the signal converter 5 is connected to an image memory 10.

The image data transferred through the telephone line 1 is applied to the modem 4 via the line control unit 3, the image data is demodulated by the modem 4 and applied to the signal converter 5, and the image data inputted by the signal converter 5 is The data signal is converted into a television signal and input to the image memory 10 via the switch 9, and the transferred image is displayed on the screen of the television receiver.

When transmitting an image, capture your own image with a TV camera, apply the video signal from the TV camera to the input switch 6, and display the image on the screen of the TV receiver using a strobe light as shown in Figure 2. By selecting a pose of your choice and specifying an address number by operating the system controller 16,
The memory controller 15 is activated to read the screen at the specified address from the image memory 1-0, input the image data to the signal converter 5, and convert the television signal into an image specified by the TTC standard. By converting it into a signal, it is transmitted to the called party through the telephone line 1.

If the output from the signal converter 5 is made to be an analog signal, instead of using the switch 9 as an input means to the multi-screen display circuit of the television receiver, in addition to the input switch 6 for the video signal, It can also be input to the receiver's multi-screen display circuit.

〔Effect of the invention〕

As explained above, according to the present invention, the image memory and multi-screen display circuit of a television receiver having a large screen that employs a digital circuit are used to reproduce one's own image on the screen of the television receiver using a strobe light. You can now freely select your favorite pose from the played images and send it to the other party, and images sent from the other party can also be played back using the image memory of the TV receiver. This makes it possible to integrate a television broadcast receiver and a video telephone, which greatly contributes to improving the performance of the video telephone.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit block diagram of the main parts of a videophone system showing an embodiment of the present invention, Fig. 2 is a screen display diagram using strobe playback, and Fig. 3 is a still picture videophone system showing a conventional example. It is an electric circuit block diagram. 1.21...Telephone line, 2.22 - Telephone,
3.23...Line control unit, 4.21-...
Modem, 5...-Signal converter, 6,9.13...
-・Switcher, 7,12--・Analog core, 8.25
．． 30-A/Di converter, 10.26... Image memory 11.27... D/A converter, I4.
・-Synchronization signal processing circuit, 15--Memory controller, 16--System controller, 28--CRT,
29-...COD camera.

Claims (2)

[Claims] (1) Connect the video signal to Y/C via the video input switch
The image is input to a separation circuit, separated into a luminance signal and a color difference signal by the Y/C separation circuit, each of which is sequentially input to and stored in an image memory via an A/D converter, and the image is stored in the image memory. In a television broadcast receiver using a digital circuit that enables multi-screen display in which data is sequentially read out, inputted to a matrix circuit via a D/A converter, converted into R, G, and B signals, and displayed as an image. , an input means to the image memory is provided, the image data transferred through the telephone line is applied to the modem via the line control unit, the image data is demodulated by the modem and applied to the signal converter, and the image data is demodulated by the modem and applied to the signal converter; The input image data signal is converted into a television signal and inputted to the image memory by the input means and stored in the image memory, and the D
The image data signal is outputted to the /A converter to display the image on the screen of the television broadcasting receiver, and the video signal from the camera is sent to the input switch, the Y/C separation circuit, and the A/D converter. input the image signal to the image memory via the image memory and store it in the image memory, and output the image signal from one branch of the readout circuit to the D/A converter to display a multi-image on the screen of the television broadcast receiver. Seshime again,
The other branch of the readout circuit is connected to the signal converter to enable signal input from the image memory to the signal converter, and further the image signal is connected to the telephone line via the modem and the line control unit. A videophone system characterized by being capable of transmission. (2) A memory controller provided in the image memory assigns an address to each screen and stores it in the image memory, and it is possible to selectively branch and read from the image memory by specifying the address. Claim (1)
The videophone system described.