KR19990032094U - External input signal transmission device of video telephone - Google Patents

Abstract

end. TECHNICAL FIELD The invention described in the claims pertains to a videophone.

I. An object of the present invention is to provide an external input signal transmission apparatus of a video telephone capable of transmitting video and audio signals input from the outside to a video telephone on the receiving side.

All. Summary of the Invention Solution of the Invention: An external input signal transmission apparatus of a video telephone having a video codec and a voice codec, the control unit outputting a switching switching signal in response to a mode switching command, and a switching operation by the switching switching signal. A first switching circuit for selectively outputting one of the video signals inputted to the video codec, and a second switching circuit for selectively outputting one of the audio signals input by switching operation by the switching switching signal to the audio codec. And a Y / C separation and color demodulation unit for Y / C separation and color demodulation and output of the video signal input from the outside, and to restore the demodulated video signal to R, G, and B signals and output the same to the first switching circuit. Characterized in a matrix circuit.

la. Important use of design: We can use in videophone.

Description

External input signal transmission device of video telephone

The present invention relates to a video telephone, and more particularly, to an external input signal transmission apparatus of a video telephone capable of transmitting video and audio signals input from the outside to a receiving side.

A video telephone is a communication means by which a caller and a called party talk to each other while looking at each other's appearance, and not only process audio data but also simultaneously process video data. That is, the video telephone may transmit the voice received through the microphone and the image captured by the camera to the counterpart through the ISDN network, and process the voice and video information of the counterpart received through the ISDN network to display on the display device. to be. However, in general video telephones, since only video and audio signals input through a camera and a microphone are transmitted to a receiver, there is a problem in that video and audio information required between a transmitting party and a receiving party is not transmitted.

Accordingly, an object of the present invention is to provide an external input signal transmitting apparatus of a video telephone capable of transmitting video and audio signals input from the outside to a receiving video telephone.

In the present invention for achieving the above object, in the external input signal transmission apparatus of a video telephone having a video codec and a voice codec,

A control unit which outputs a switching switching signal in response to the mode switching command;

A first switching circuit for selectively outputting one of the image signals input by the switching operation by the switching switching signal to the image codec;

A second switching circuit for selectively outputting one of the voice signals input by the switching operation by the switching switching signal to the voice codec;

Y / C separation and color demodulation unit for Y / C separation and color demodulation and output of video signal input from outside;

And a matrix circuit for restoring the demodulated video signal to the R, G, and B signals and outputting the demodulated video signal to the first switching circuit.

1 is a block diagram of a video telephone according to an embodiment of the present invention.

Hereinafter, an operation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a block diagram of a video telephone equipped with an external input signal transmission apparatus according to an embodiment of the present invention. Referring to FIG. 1, first, the camera 10 applies a color image captured through the lens unit to the image codec 14 through the switching circuit 12, and the microphone 16 inputs an audio signal to switch the circuit 18. Is applied to the voice codec 20 through. The image codec 14 digitally converts the color image applied from the camera 10 and compresses it according to the international communication standard H.261. In addition, the image codec 14 restores compressed image data applied from a communication partner through the network connection unit 22. The voice codec 20 compresses the voice applied from the microphone 16. In addition, the voice codec 20 restores the compressed voice data applied from the communication partner through the network connection unit 22. The network connection unit 22 is connected to an ISDN network and demultiplexes voice data and video data in a compressed form from a communication partner and provides them to the voice codec 20 and the video codec 14, respectively. The monitor 24 displays an image according to the image data reconstructed by the image codec 14, and the speaker 26 transmits the audio data reconstructed by the audio codec 20. Accordingly, the user can watch the communication partner through the monitor 24 and listen to the voice transmitted from the communication partner through the speaker 26. On the other hand, the keypad 28 is provided with a plurality of function keys so that the user can control the operation of the video telephone, and when the function key is pressed generates the corresponding key data and outputs it to the CPU (30). The memory 32 includes a ROM in which a control program for controlling the overall operation of the video telephone is stored, and a RAM for temporarily storing data generated during the control operation. On the other hand, the CPU 30, which is a central processing unit, controls the overall operation of the video telephone in accordance with the control program stored in the memory 32. For example, the CPU 30 outputs the switching switching signal in response to the mode switching signal being input through the P1 terminal. The mode switching signal is a signal input for transmitting a video signal and an audio signal input from an outside of the video telephone to the receiving side video telephone and may be input by a switching on / off operation of a mode switching switch attached to the outside of the video telephone body. have. In addition, the keypad 28 may be provided with a separate function key to instruct the transmission of the external input signal. In the embodiment of the present invention, a mode switching switch is attached to the outside of the video telephone main body to instruct the transmission of the external input signal. On the other hand, the composite video signal CVBS reproduced and output from the VCR is input to the Y / C separation and color demodulation unit 34 through the video input terminal, separated into the luminance signal Y and the color signal C, and then demodulated according to the NTSC method, followed by a matrix circuit. At 36, the R, G, and B signals, which are the primary color signals, are restored. The restored R, G, and B signals are applied to the image codec 14 through the switching circuit 12. The audio signals L and R reproduced and output from the VCR are also applied to the voice codec 20 through the audio input terminal and the switching circuit 18.

Hereinafter, the operation of the external input signal transmission apparatus of the video telephone will be described. First, when the user switches on the mode switching switch to transmit the video and audio signals recorded on the VCR to the receiving user, the CPU 30 connects to the P1 terminal. Through the mode switching signal input can be detected. The CPU 30 outputs a switching switch signal through the P2 terminal in response to the mode switch signal input. The switching switching signals output in this way are applied to the switching circuits 12 and 18, respectively, so that the signal paths connected to the camera 10 and the microphone 16 are connected to the matrix circuit 36 and the audio input terminal. Then, when the VCR is operated in the playback mode by the user, the video signal reproduced from the VCR is applied to the Y / C separation and color demodulation unit 34 through the video input terminal, and separated and demodulated into Y and C signals, followed by the matrix circuit ( The signal is restored to the R, G, and B signals through the 36 and applied to the image codec 14. The R, G, and B signals applied to the image codec 14 are then digitally converted and compressed according to the international communication standard H.261, and then transmitted to the receiving party through the network connection 22. Meanwhile, the voice signal is also applied to the voice codec 20 through the audio input terminal and the switching circuit 18, and then compressed and transmitted to the receiving communication partner.

Therefore, the receiving communication partner can normally view and listen to the video and audio signals transmitted from the transmitting communication partner through the monitor and the speaker.

As described above, the present invention has an advantage that information can be exchanged between communication partners because the signal input from the outside through the video input terminal and the audio input terminal can be signaled and transmitted to the communication partner.

Claims (2)

In the external input signal transmission device of a video telephone having a video codec and a voice codec, A control unit which outputs a switching switching signal in response to the mode switching command; A first switching circuit for selectively outputting one of the image signals input by the switching operation by the switching switching signal to the image codec; A second switching circuit for selectively outputting one of the voice signals input by the switching operation by the switching switching signal to the voice codec; Y / C separation and color demodulation unit for Y / C separation and color demodulation and output of video signal input from outside; And a matrix circuit for restoring demodulated video signals to R, G and B signals and outputting them to the first switching circuit. The apparatus of claim 1, wherein the mode switching command is input by an operation of a mode switching switch provided outside the main body of the video telephone.