KR100229684B1 - Video communication apparatus in multi-media 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, 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.

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 for 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 is connected to a plurality of video communication terminals for processing video and audio signals, and various trunk lines, respectively, and one of the plurality of video communication terminals and the 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 which compresses video and audio to ISDN trunk line and transmits 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. Restores video and audio signals from the video communication terminal of the PSTN trunk line by compressing the video and audio signals from the video communication terminal to the PSTN trunk line and restores the video and audio signals from the PSTN trunk line. H.324 video communication gateway that compresses and outputs video and audio signals. The video and audio signals input from the video communication terminal are restored by the restoration algorithm, compressed into video and audio for LAN, and sent to the LAN, and the video and audio signals from the LAN are restored. LAN video communication gateway that compresses and outputs, and video and audio signals inputted from multiple video communication terminals are restored by a restoration algorithm, compressed into video and audio suitable for ATM trunk lines, and sent to ATM trunk lines and inputted from ATM trunk lines And ATM video communication gateways for restoring audio signals and compressing them into video and audio signals suitable for terminals, H.320 video communication gateways, H.324 video communication gateways, LAN video communication gateways, ATM video communication gateways, and many others. Connected between video communication terminals of Switching connection between the corresponding video conferencing terminal, and in the case of a trunk line call is provided as a multimedia switch for switching to the corresponding gateway.

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 the video and audio signals corresponding to the ISDN trunk line, and sends them to the ISDN trunk line 40. The video input from the ISDN trunk line 40 is performed. 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 input from the video communication terminal 10 to the LAN 80 by compressing the video and audio signals corresponding to the LAN, 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 decompresses the video and audio signals input from the video communication terminal 10 by using a restoration algorithm, compresses the video and audio signals corresponding to the ATM trunk line, and sends them to the ATM trunk line 100. The video and audio input from the ATM trunk line 100 is performed. 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 between conference terminals and switching connection to corresponding gateway in case of trunk line call.

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

A general telephone unit 100, a controller 105 for controlling an overall video communication terminal for video communication, a camera and display unit 101 for photographing a subject to output an image signal or displaying an image, and input / output from the camera 101 or a line A DPCM image compression / recovery unit 102 for compressing or restoring a video signal to DPCM image data, and a microphone and a speaker 103 for converting and outputting an input audio signal into an electrical signal and converting an audio signal input from a 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 Output, is by demultiplexing a video signal received from the line transceiver 107 is composed of the DPCM image compression / decompression unit 102, a multiplexing unit 106 that outputs the PCM audio compression / decompression 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 subscriber is called in the video communication terminal, the video signal captured by the camera and the display unit 101 and the captured image of the user is compressed to PCM data and applied to the multiplexing device 106. The voice signal input from the microphone 103 is compressed by the PCM voice decompression unit 104 into PCM data and applied to the multiplexing device 106. Therefore, the multiplexing device 106 applies the video signal and the audio signal to the line transmitter 107 multiplexed. 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 before 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 / restore unit 206 compresses the reconstructed video signal according to the ISDN trunk line and outputs it to the second MUX / DEMUX 207. The voice compression / restore unit 205 compresses the reconstructed voice signal according to 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 trunk line by interfacing with the ISDN trunk 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 a video communication apparatus in a private multimedia system, a plurality of video communication terminals for processing video and audio signals, and a plurality of video communication lines, respectively, are connected to various trunk lines to perform 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. Video communication device in multimedia system. The video communication apparatus according to claim 1, wherein the plurality of video communication gateways reconstruct video and audio signals inputted from the multimedia switch by a restoration algorithm, compress the video and audio signals corresponding to ISDN trunk lines, and transmit the video and audio signals to ISDN trunk lines. H.320 video communication gateway which restores input video and audio signals and compresses them into video and audio signals suitable for the terminal and outputs them to the multimedia switch, and restores video and audio signals input from the multimedia switch by the restoration algorithm. H. Compresses the video and audio signals corresponding to the PSTN trunk lines, transmits them to the PSTN trunk lines, restores the video and audio signals inputted from the PSTN trunk lines, and compresses the video and audio signals corresponding to the terminal to output them to the multimedia switch. 324 video communication gateway and the multimedia The video and audio signals inputted from the location are restored by the restoration algorithm, compressed into video and audio for LAN, and sent to the LAN, and the video and audio signals from the LAN are restored. LAN video communication gateway which compresses and outputs to the multimedia switch, and video and audio signals inputted from the multimedia switch are restored by a restoration algorithm, compressed into video and audio corresponding to ATM trunk lines, and transmitted to the ATM trunk lines. And an ATM video communication gateway for restoring video and audio signals input from a trunk line and compressing the video and audio signals to a terminal for output to the multimedia switch. In a 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, and video and audio signals input from the plurality of video communication terminals are restored by a restoration algorithm. H.320 video communication gateway for compressing video and audio to ISDN trunk line and sending out to ISDN trunk line, restoring video and audio signals input from ISDN trunk line and then compressing and outputting video and audio signals for terminal. After reconstructing video and audio signals inputted from a plurality of video communication terminals by a reconstruction algorithm, compressing them into video and audio corresponding to a PSTN trunk line, sending them to the PSTN trunk line, and restoring the video and audio signals inputted from the PSTN trunk line. H.324 image which is compressed and output into video and audio signal suitable for terminal The video and audio signals inputted from the communication gateway and the plurality of video communication terminals are restored by a restoration algorithm, compressed into video and audio corresponding to the LAN, and sent to the LAN, and the video and audio signals input from the LAN are restored. LAN video communication gateway which compresses and outputs the video and audio signals suitable for the terminal, and restores the video and audio signals inputted from the plurality of video communication terminals by a restoration algorithm to compress the video and audio for ATM lines. An ATM video communication gateway which transmits to the ATM trunk line, restores the video and audio signals input from the ATM trunk line, and then compresses and outputs the video and audio signals corresponding to the terminal; and the H.320 video communications gateway and the H.324 image. Communication gateway, LAN video gateway, ATM video gateway It is connected between the terminals for video communications, the video communication device in the private multimedia system characterized in that it is provided with a multimedia switch for switching the connection between the video conferencing terminals in the case of an internal call, and switching to the corresponding gateway in the case of a trunk line call . The video communication terminal of claim 3, wherein the plurality of video communication terminals comprise: a general telephone unit, a controller which controls the video communication terminal in general so as to perform video communication, a camera which photographs a subject to output a video signal or displays an image; A display unit, a DPCM image compression / restore unit for compressing or restoring image signals input and output from the camera or line into DPCM image data, and converting and outputting the input audio signal into an electrical signal and audible the audio signal input from the line A microphone and a speaker for converting the 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 the input video and audio signals; DPCM image compression / restore unit, images output from PCM audio compression / restore unit, and And multiplexing the multiplexed sex signals and demultiplexing the video signals received from the line transceiver to output the DPCM video compression / restoration unit and the PCM audio compression / restoration unit. Device.

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