KR100451457B1 - Video phone by using cable modem - Google Patents

Abstract

The present invention relates to a video telephone using a cable modem. More particularly, the present invention relates to a video telephone that can simultaneously perform reception of digital broadcast and video telephone function using a cable modem instead of a conventional modem for PSTN.

According to the present invention, there is provided a video communication apparatus comprising: a first video telephone for a video call between both parties; A computer device (PC) connected to the first video telephone and a LAN to connect to the Internet during a video call; A general telephone connected to the first video telephone by a telephone line for voice call; A first branch connected to the first video telephone by a coaxial cable and configured to distribute a data signal connected to each line; A cable modem connected to the first branch and an optical cable for transmitting video and audio data between the first branch and the optical cable; A second branch connected to the cable modem and the optical cable, and for distributing a data signal connected to each line; A video telephone using a cable modem is provided, which is connected to the second branch by a coaxial cable and includes a second video telephone for making a video call with the other party.

Therefore, the present invention can be reduced to 1/10 of the connection time of the existing PSTN network modem by using a cable modem; 2) using a video phone, but can also perform a variety of tasks, such as Internet or TV watching; 3) In addition to video calls, it can be used as a VoIP system because a general telephone can be connected to the outside.

Description

Video phone by using cable modem

The present invention relates to a video telephone using a cable modem. More specifically, the present invention relates to a technology for enabling the simultaneous reception of digital broadcasting and the function of a video telephone by adding a video telephone function to a cable set-top box for receiving digital broadcasting using a cable modem.

Video phones use cable modems to send and receive video, voice and data. When the video phone is configured using the cable modem, the video screen and the audio signal can be seen without interruption.

1 is a schematic configuration diagram of a video telephone using a conventional public switched telephone network (PSTN).

Referring to FIG. 1, the video telephones 10a and 10b constitute a system using a PSTN modem in the PSTN network 20. At this time, the line used is a general telephone line (30).

Referring to the operation of the video phone, first, the video phone 10a for PSTN makes a call to the video phone 10b of the other party. After the other party's video telephone 10b receives the call, the two video telephones 10a and 10b perform modem connection of the PSTN network 20. After the modem connection, each of the video phones 10a and 10b compresses the video and the audio to the other video phone 10b. After decoding the received video and audio, the video is displayed on the screen, and the audio is sent to a handset or a speaker.

As described above, the conventional video phone for PSTN uses a modem using a general PSTN network. This has a problem in that the access rate varies according to the quality of a general telephone line, and even after access, the data of the video cannot be transmitted or received in real time according to the movement.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide a video telephone that can simultaneously perform the function of receiving a digital broadcast and a video telephone using a cable modem instead of a conventional PSTN modem. It is.

As a technical idea for achieving the above object of the present invention

A first video telephone for a video call between two parties;

A computer device (PC) connected to the first video telephone and a LAN to connect to the Internet during a video call;

A general telephone connected to the first video telephone by a telephone line for voice call;

A first branch connected to the first video telephone by a coaxial cable and configured to distribute a data signal connected to each line;

A cable modem connected to the first branch and an optical cable for transmitting video and audio data between the first branch and the optical cable;

A second branch connected to the cable modem and the optical cable, and for distributing a data signal connected to each line;

It is connected to the second branch and the coaxial cable provides a video telephone using a cable modem, characterized in that comprises a second video telephone for the video call with the other party.

1 is a schematic configuration diagram of a video telephone using a conventional PSTN network.

2 is a view schematically showing the configuration of a video telephone using a cable modem according to the present invention.

3 is a block diagram showing in detail the configuration of the video modem for the cable modem according to the present invention.

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

2 is a view schematically showing the configuration of a video telephone using a cable modem according to the present invention.

Referring to FIG. 2, a first video phone 100a for a video call between the two parties and a computer device 110 connected to the first video phone 100a through a LAN to connect to the Internet during a video call. And, the first video telephone (100a) is connected to the telephone line for the general telephone 120 for voice calls, the first video telephone (100a) and the coaxial cable 130, the data signal connected to each line A first modem 140a for distributing a cable, a cable modem 160 connected to the first cable 140a and an optical cable 150 for transmitting video and audio data to both sides, and the cable modem ( 160 and an optical cable 150, the second branch 140b for distributing the data signal connected to each line, and the second branch 140b and the coaxial cable 130 is connected to the image of the other party It includes a second video telephone (100b) for the call .

Here, the video output of the video telephones (100a, 100b) can use a built-in LCD, it can also be viewed on a TV using an external output port.

Preferably, the present invention has an Ethernet port so that a video call can be made and a PC can be used together with the Internet.

In addition, it can be used for cable VoIP (Voice of Internet Phone) or video phone by connecting external phone to built-in RJ-11 port.

Next, an operation process of the video telephone using the cable modem shown in FIG. 2 will be described.

First, a call is made from the video telephone 100a existing in the cable network to the other video telephone 100b. At this time, the other party's video telephone 100b receives the call.

Next, each of the video phones 100a and 100b compresses the video and the audio and transmits the video and audio to the counterpart phone through the cable modem 160. In this case, when the video and audio data are not large, the video and audio may not be compressed.

Then, the video phones 100a and 100b decode the received video and audio, and output the video to the screen, and output the audio to a speaker.

In this case, operations such as control of the screen of the counterpart may be performed by exchanging control data in addition to video and audio.

On the other hand, the received video and audio can be stored through a data storage device, and the video and audio used in the cable network is allocated to one channel to ensure the quality of service (Quality Of Service; Can be sent.

At this time, the output of the image from the video telephone (100a, 100b) can use a built-in LCD, it can also be viewed on a TV using an external output port.

In addition, the user can use the camera with a built-in screen, and can use an external camera by using an external input port.

According to the present invention, a cable modem video telephone is provided with an Ethernet port for a LAN so that the Internet can be used in equipment such as a PC even during a video call using the port.

In addition, the video modem for the cable modem has a built-in RJ-11 port, which can be used for general telephones, so that the cable modem video phone itself can be used without a built-in key for DTMF or a VoIP for the cable modem. .

In addition, the video modem for the cable modem can receive a digital broadcast through a cable modem, which is a basic set top box function, and make a video call using the video phone while receiving the digital broadcast.

Therefore, by configuring the video telephone of the present invention as described above, it is possible to receive digital broadcast, and to transmit video, audio, and data.

3 is a block diagram showing in detail the configuration of the video modem for the cable modem according to the present invention.

3, the camera module 302, the display unit 304, the video / audio external input terminal 306, the video signal decoder 308, the video signal encoder 310, and the TV encoder 312. ), Video / audio external output stage 314, video memory unit 316, video data compression / decompression unit 318, audio data compression / decompression unit 320, system ROM 322, audio output circuit unit 324 , Main controller 326, system memory unit 328, hookswitch detection unit and telline mux circuit unit 330, digital broadcast video / audio decoder unit 332, key interface unit 334, Ethernet logic unit 336 , A cable modem 338, and an infrared receiver circuit unit 340. In addition, a microphone (MIC), a speaker (SPK), ports (RJ-11, RJ-45) and the like are connected.

The camera module 302 captures an external screen from the camera control chip and transfers the captured video data to the video signal decoder 308.

The video decoder 308 converts the analog signal transmitted from the camera module 302 or the video / audio external input terminal 306 into a digital signal for use by the video data compressor / decompressor 318. Play a role.

The video data compressor / decompressor 318 compresses the digital signal transmitted from the video signal decoder 308 to reduce the amount of data, and externally stores the video memory for use during the compression process. Video memory 316 may be used.

In addition, the video signal that is compressed and transmitted from the other party is released and transmitted to the video signal encoder 310.

The video signal encoder 310 converts the video signal transmitted from the video data compressor / decompressor 318 into an analog signal and sends the analog signal to the display unit 304 or the video / audio external output terminal 314. do.

The audio data compressor / decompressor 320 compresses a voice signal coming through a microphone MIC to reduce the amount of data. In addition, the audio signal compressed and transmitted from the other party is released and transmitted to the speaker SPK.

In the cable modem 338, the video and audio signals compressed by the video data compressor / decompressor 318 and the audio data compressor / decompressor 320 are transmitted to the video telephone of the other party through the cable modem. .

The main controller 326 performs control related to the overall system such as giving control signals and transmitting video and audio signals so that the respective blocks operate normally.

The system ROM 322 is equipped with main software for operating a video telephone and is booted when the power is turned on to operate the system. The system memory unit 328 is a memory used when the main software executes.

The key interface 334 serves to process a key for use when a user gives a control command to the system.

The hook detection unit and the Tel Line Mux circuit unit 330 detect an on / off of a hook switch of an external telephone by using a general telephone to connect an external telephone. It is a circuit for switching telephone lines.

The Ethernet logic unit 336 plays a role of allowing the Internet to be accessed using a PC or the like even during a video call using the cable modem 338.

The digital broadcasting video / audio decoder 332 serves to decode the digital broadcasting video and audio data.

As described above, according to the present invention, the following effects can be obtained by constructing a video telephone using a cable modem in the cable network instead of the PSTN modem used in the conventional PSTN network.

First, when using a normal PSTN modem, it takes about 12 to 30 seconds to connect to a video phone. However, using the cable modem according to the present invention can reduce the connection time to about 1/10.

Secondly, in the general PSTN, the video screen could not be viewed using the 33.6 Kbps modem. However, when the cable modem according to the present invention is used, this problem is solved and the actual video screen can be transmitted and received.

Third, in the PSTN network, other operations cannot be performed on the telephone line while the video telephone is in operation. However, in the cable network according to the present invention, various operations such as the Internet or TV watching can be separately performed while using the video telephone.

Fourth, the present invention can be used by connecting a general telephone to the outside can be used as a VoIP (Voice of Internet Phone) system for cable modem in addition to video calls.

Fifth, the present invention can also make a video call using a video phone while watching a digital broadcast.

Claims (3)

In a video telephone using a cable modem, A first video telephone having a built-in Ethernet logic port (ELP) for Internet access and a video / audio decoder device for digital broadcasting for watching a video call and a digital broadcast between the two parties; A computer device (PC) connected to the first video telephone and a LAN to connect to the Internet during a video call; A general telephone connected to the first video telephone by a telephone line for voice call; A first branch connected to the first video telephone by a coaxial cable and configured to distribute a data signal connected to each line; A cable modem connected to the first branch and an optical cable for transmitting video and audio data between the first branch and the optical cable; A second branch connected to the cable modem and the optical cable, and for distributing a data signal connected to each line; Built-in Ethernet logic port (ELP) for internet access and video / audio decoder device for digital broadcasting, and a second video telephone for connecting video with the second branch and a coaxial cable for watching video calls and digital broadcasting with the other party. Video phone using a cable modem, characterized in that made. delete delete