KR19980065537A - Video Communication Device in Private Multimedia System - Google Patents

Abstract

In a private multimedia system, the present invention relates to a video communication apparatus for performing video communication using a multimedia switch corresponding to various trunk lines.

The video communication apparatus of the private multimedia system has a plurality of video communication terminals for processing video and audio signals, and is connected to various trunk lines to enable video communication between one of the plurality of video communication terminals and the trunk lines connected thereto. And a plurality of video communication gateways, a plurality of video communication terminals, and a plurality of video communication terminals and a multimedia switch for forming a communication path between the plurality of video communication gateways.

Description

Video Communication Device in Private Multimedia System

1 is a block diagram of a video communication network system according to the present invention.

2 is a structural diagram of a video communication terminal according to the present invention;

3 is a block diagram of a video communication gateway according to the present invention.

Explanation of symbols on the main parts of the drawings

10: video communication terminal 20: multimedia switch

30: H.320 video communication gateway 40: ISDN trunk line

50: H.324 video communication gateway 60: PSTN trunk line

70: LAN video communication gateway 80: LAN

90: ATM video communication gateway 100: ATM trunk line

The present invention relates to a video communication apparatus for performing a video communication using a multimedia switch in response to various trunk lines in a private multimedia system.

Conventional video conferencing terminals can provide internal and external trunk line video calls to more office subscribers using a voice call-oriented private exchange or key phone system, and these video conferencing terminals can communicate only on a single trunk line. In order to compose a communication system for various CO lines, various video / audio compression devices, multiplexers, and network modules are implemented according to the CO lines. Such video conferencing terminals have to be configured to correspond to the corresponding trunk lines in order to enable communication over various trunk lines, thereby increasing the price of the terminals and failing to provide efficient video communications.

Accordingly, an object of the present invention is to provide a video communication apparatus that enables video communication in response to various trunk lines.

Another object of the present invention is to provide a video communication apparatus capable of reducing the price of a terminal by enabling video communication corresponding to various trunk lines.

In order to achieve the above object, the video communication apparatus according to the present invention comprises a plurality of video communication terminals for processing video and audio signals and one of a plurality of video communication terminals connected to various trunk lines, respectively, and a trunk line connected thereto. And a plurality of video communication gateways for enabling video communication therebetween, and a multimedia switch for forming a communication path between a plurality of video communication terminals and between a plurality of video communication terminals and the plurality of video communication gateways.

According to an embodiment of the present invention, a video communication apparatus includes a plurality of video communication terminals for outputting video and audio signals input from a camera and a microphone, and a video and audio signal input from a plurality of video communication terminals. H.320 video communication gateway that compresses video and audio to ISDN trunk line and sends it to ISDN trunk line, restores video and audio signals input from ISDN trunk line, and then compresses and outputs video and audio signals to terminal. Video and audio signals inputted from the video communication terminal are restored by the restoration algorithm and compressed into video and audio corresponding to the PSTN trunk line and sent to the PSTN trunk line, and the video and audio signals input from the PSTN trunk line are restored. H.324 video communication gateway that compresses and outputs video and audio signals The video and audio signals input from the new terminal are restored by the restoration algorithm and compressed into video and audio for the LAN and sent to the LAN. The video and audio signals from the LAN are restored and then compressed into video and audio signals for the terminal. LAN video communication gateway, and video and audio signals inputted from a plurality of video communication terminals by a restoration algorithm, which are compressed into video and audio suitable for ATM trunk lines, transmitted to ATM trunk lines, and inputted from ATM trunk lines. Restoring audio signals and compressing and outputting them into video and audio signals for the terminal, H.320 video gateway, H.324 video gateway, LAN video gateway, ATM video gateway and many It is connected between the video communication terminals, and in case of an internal call For the conference terminals connected to the switching period, and a switch for switching a multimedia gateway connected to the case of an external call.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

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

1 is a block diagram of a video communication network system according to the present invention.

The video communication terminal 10 outputs video and audio signals input from a camera and a microphone. The H.320 video communication gateway 30 decompresses the video and audio signals input from the video communication terminal 10 by the restoration algorithm, compresses them into video and audio corresponding to the ISDN trunk line, and sends them to the ISDN trunk line 40. And restores the audio signal and compresses the video signal into a video and audio signal suitable for the terminal. The H.324 video communication gateway 50 decompresses the video and audio signals input from the video communication terminal 10 by the restoration algorithm, compresses the video and audio signals corresponding to the PSTN trunk lines, sends them to the PSTN trunk lines 60, and inputs the images from the PSTN trunk lines 60. And restores the audio signal and compresses the video signal into a video and audio signal suitable for the terminal. The LAN video communication gateway 70 restores the video and audio signals received from the video communication terminal 10 by using a restoration algorithm, compresses the video and audio signals to the LAN, compresses them to LAN 80, and restores the video and audio signals input from the LAN 80. After that, the video is compressed and output into a video and audio signal. The ATM video communication gateway 90 recovers the video and audio signals input from the video communication terminal 10 by restoring algorithms, compresses the video and audio signals to the ATM trunk line 100, and transmits the video and audio signals to the ATM trunk line 100. After recovering the signal, it is compressed and output into video and audio signals suitable for the terminal. The multimedia switch 20 is connected between the H.320 video communication gateway 30, the H.324 video communication gateway 50, the LAN video communication gateway 70, the ATM video communication gateway 90, and the video communication terminal 10. Switching connection of conference terminal and switching connection to corresponding gateway in case of trunk line call.

2 is a structural diagram of a video communication terminal according to the present invention.

A general telephone unit 100, a controller 105 which controls the video communication terminal to perform video communication, a camera and display unit 101 which photographs a subject to output an image signal or displays an image, and is input from the camera 101 or a line. A DPCM image compression / recovery unit 102 for compressing or restoring the Youngsan signal to DPCM image data, and a microphone and speaker 103 for converting and outputting an input audio signal into an electrical signal and converting an audio signal input from the line into an audible signal; And a line interface 107 for transmitting and receiving video and audio signals under control of a controller 105 and a line interface 108 connected between the line transceiver 107 and a line and interfacing input video and audio signals, and the DPCM video compression / restore unit. 102, multiplexing the video and audio signals output from the PCM audio compression / recovery unit 104 And a multiplexing device 106 for outputting and demultiplexing the video signal received from the line transmitter and receiver 107 to the DPCM video compression / restoration unit 102 and the PCM audio compression / restoration unit 104.

3 is a block diagram of a video communication gateway according to the present invention.

Referring to FIG. 1 to FIG. 3, the operation of the embodiment of the present invention will be described. First, if another video communication terminal is called from the video communication terminal 10, the multi-switch 20 switches to another video communication terminal to establish a video call. To connect.

However, if the ISDN trunk line presser is called in the video communication terminal, the video signal captured by the user's image captured by the camera and the display unit 101 is compressed into PCM data and applied to the multiplexing device 106. The voice signal input from the microphone 103 is compressed into PCM data by the PCM voice compression recovery unit 104 and applied to the multiplexing device 106. Therefore, the multiplexing device 106 applies the video signal and the audio signal to the multiplexing line transceiver 107. The line transmitter 107 transmits the multiplexed video and audio signals to a line interface 108. In the line interface 108, the video and audio signals transmitted from the line transceiver 107 are interfaced to the line and transmitted to the line. At this time, the video and audio signals sent to the line is sent to the multimedia switch 20. The multimedia switch 20 then sends the compressed video and audio signals from the video communication terminal 10 to the H.320 video communication gateway 30. The H, 320 video communication gateway 30 restores the video and audio signals by the internal restoration algorithm, reproduces the original video and audio signals prior to compression, compresses them into video and audio signals suitable for ISDN trunk lines, and then multiplexes the ISDN. Send by CO. The operation of the H.320 video communication gateway 30 will be described in detail with reference to FIG. 3. The video and audio signals input through the multimedia switch 20 are interfaced to the line connection unit 201 and applied to the line transmitter 202. The controller 200 controls the line transceiver 202 to receive the signal input through the line connection unit 201 and apply it to the MUX / DEMUX 203. In the first MUX / DEMUX 203, the received signal is demultiplexed and applied to the internal video and audio compression / restore unit 204. The internal video and audio compression / recovery unit 204 restores the compressed video and audio signals under control of the control unit 200 and applies them to the image compression / restore unit 206 and the audio compression / restore unit 205, respectively. The signal processor 208 between the terminals processes the signal under the control of the controller 200. At this time, the image compression / recovery unit 206 compresses the reconstructed video signal according to the ISDN trunk line and outputs it to the second MUX / DEMUX 207. In addition, the speech compression / recovery unit 205 compresses the restored speech signal in accordance with the ISDN trunk line and outputs it to the second MUX / DEMUX 207. In the second MUX / DEMUX 207, the compressed video and audio signals are multiplexed under the control of the signal processor 208 between the terminals and output to the network access unit 210. Then, the network connection unit 210 transmits the multiplexed audio signal and the video signal to the ISDN main line by interfacing to the ISDN main line. At this time, the protocol between video communication terminals is made in accordance with ISDN-related standards. When the video communication terminal 10 becomes the video communication receiving side from the trunk line, the reverse process is performed to realize the communication.

In the embodiment of the present invention has been described as an example of communication between the video communication terminal via the ISDN trunk line, but the operation of communication between the video communication terminal via the PSTN trunk line, LAN, ATM trunk line is also the same, the protocol progress or during data processing Use the standard method according to the trunk line. This is controlled by the controller 200 as a whole.

As described above, the present invention can communicate with various types of trunk line paths assigned to the video communication terminal by connecting various video communication gateways by multimedia switches in response to various trunk line paths in a private multimedia system. Therefore, the cost of the video communication terminal can be reduced.

Claims (4)

In the video communication apparatus in a private multimedia system, A plurality of video communication terminals for processing video and audio signals; A plurality of video communication gateways respectively connected to various trunk lines to enable video communication between one of the plurality of video communication terminals and the connected trunk lines; And a multimedia switch for forming a communication path between the plurality of video communication terminals and between the plurality of video communication terminals and the plurality of video communication gateways. The method of claim 1, The plurality of video communication gateways, The video and audio signals inputted from the multimedia switch are restored by the restoration algorithm, compressed into video and audio corresponding to the ISDN trunk line and sent to the ISDN trunk line, and the video and audio signals input from the ISDN trunk line are restored and then matched to the terminal. And an H.320 video communication gateway which compresses the audio signal and outputs it to the multimedia switch. The video and audio signals inputted from the multimedia switch are restored by a restoration algorithm, compressed into video and audio corresponding to a PSTN trunk line, and sent to the PSTN trunk line, and the video and audio signals received from the PSTN trunk line are restored to the terminal. An H.324 video communication gateway for compressing the video and audio signals to output the multimedia switch; The video and audio signals inputted from the multimedia switch are restored by a restoration algorithm, compressed into video and audio for LAN, and transmitted to the LAN. A LAN video communication gateway which restores the video and audio signals input from the LAN and compresses the video and audio signals to the terminal and outputs them to the multimedia switch; After recovering the video and audio signals inputted from the plurality of multimedia switches by a restoration algorithm, compressing the video and audio signals corresponding to the ATM trunk lines, sending them to the ATM trunk lines, and restoring the video and audio signals input from the ATM trunk lines. And an ATM video communication gateway which compresses the video and audio signals corresponding to the terminal and outputs them to the multimedia switch. In the video communication apparatus in a private multimedia system, A plurality of video communication terminals for outputting video and audio signals input from a camera and a microphone; The video and audio signals inputted from the plurality of video communication terminals are restored by a restoration algorithm, compressed into video and audio corresponding to the ISDN trunk line, and sent to the ISDN trunk line. After recovering the video and audio signals input from the ISDN trunk line, the terminal is restored. H.320 video communication gateway for compressing and outputting video and audio signals according to The video and audio signals inputted from the plurality of video communication terminals are restored by a restoration algorithm, compressed into video and audio corresponding to a PSTN trunk line, sent to the PSTN trunk line, and the video and audio signals received from the PSTN trunk line are restored. H.324 video communication gateway for compressing and outputting video and audio signals for the terminal Video and audio signals input from the plurality of video communication terminals are restored by a restoration algorithm, compressed into video and audio for LAN, and sent to the LAN, and then restored to video and audio signals input from LAN. LAN video communication gateway for compressing and outputting audio signal; The video and audio signals inputted from the plurality of video communication terminals are restored by a restoration algorithm, compressed into video and audio corresponding to an ATM trunk line, and sent to the ATM trunk line, and the video and audio signals received from the ATM trunk line are restored. ATM video communication gateway for compressing and outputting video and audio signals for the terminal after The H.320 video communication gateway, the H.324 video communication gateway, the LAN video communication gateway, the ATM video communication gateway, and a plurality of video communication terminals are connected. In the case of a trunk line call, the video communication device in a private multimedia system, characterized in that provided as a multimedia switch for switching to the corresponding gateway. The method of claim 3, The plurality of video communication terminals, General phone book, A controller for controlling the overall video communication terminal to perform video communication; A camera and display unit for photographing a subject to output an image signal or to display an image; A DPCM image compression / restoration unit for compressing or restoring the video signal inputted from the camera or line into DPCM image data; A microphone and a speaker for converting the input voice signal into an electrical signal and outputting the converted voice signal, and converting the voice signal input from the line into an audible signal; A line transceiver for transmitting and receiving video and audio signals under control of the controller; A line interface connected between the line transmitter and the line and interfacing input video and audio signals; The DPCM image compression / restoration unit and the video and audio signals output from the PCM audio compression / restoration unit are multiplexed and output, and the DPCM image compression / restoration unit and PCM audio compression are performed by demultiplexing the image signals received from the line transceiver. Video communication device in a private multimedia system, characterized in that consisting of a multiplexing device for outputting to the / restoring unit.