JP2001045097A - Communication terminal or communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain communication between terminals with different performance without revising the mutual terminal performance by respectively analyzing the performance of other terminal in the case of communication between the terminals whose performance such as a transfer rate, a compression method and a compression ratio differs from each other and conducting communication control processing on the basis of the result of analysis. SOLUTION: A MAIN PROCESSOR U1 analyzes capability of a terminal A2 such as a transfer rate, a compression method and a compression ratio via a channel i/fU2. Simultaneously the MAIN PROCESSOR U1 also analyzes the capability of terminals A3, A4. The MAIN PROCESSOR U1 instructs a video algorithm and bit scale CONVERTER U6 to instruct video resolution and the video algorithm of a signal that is received or sent via a multiplexer/ demultiplexer circuit U5 in the case of, e.g. a video image in order to match the capability of the terminals A2, A3, A4 with that of the terminal A1. That is, the terminal A1 conducts communication in matching with the capability of the terminal with the lowest capability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital communication line between a plurality of terminals having different performances.
The present invention relates to a communication terminal or a communication system that transmits and receives video or data.

[0002]

2. Description of the Related Art A technique for connecting terminals of different types in a conventional communication system is disclosed in Japanese Patent Application Laid-Open No. Hei 5-180015. This technology is a heterogeneous terminal connection device installed between a terminal device and a computer that cannot directly transmit and receive data to and from the terminal device, wherein the terminal-side data processing unit, the computer-side data processing unit, It comprises a conversion table, a field information table, a data conversion processing section, a field information table creation section, and a key input check section. With this configuration, a terminal device connected when the computer model is changed can respond to a case where a higher screen control function is required than in the past.

[0003]

However, in a conventional communication system, when a terminal device connected when a computer model is changed is required to have a higher screen control function than in the past. It does not disclose a technique for performing communication based on the performance of a partner when data is transmitted and received between terminals having different performances. Therefore, since it is possible to connect only with the same model of the same maker, it is not possible to connect a heterogeneous communication terminal, a communication terminal of another company and a state-of-the-art communication terminal.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and a communication terminal in which communication is performed between terminals having different performances such as a transfer speed, a compression method, and a compression ratio thereof is provided. Provided is a communication terminal having communication control means for analyzing the performance of each other terminal and performing communication control processing based on the analysis result analyzed by the analysis means.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram when applied to a video conference system in a communication system according to an embodiment of the present invention. FIG. 2 is a block diagram when a heterogeneous connection is established in the communication system according to an embodiment of the present invention. FIG. 3 is a diagram for explaining a basic connection procedure, and FIG. 3 is a block diagram of a communication terminal of the present invention which enables connection between different models.

In FIG. 1, A1 is a terminal for company A, and is a master terminal for controlling a plurality of terminals. A2 is a terminal for company B with different specifications from A1,
A3 is a model for company C having different specifications from A1 and A2, and A4 is a model b for company C having different specifications from A1, A2 and A3. A2 to A4 are slave terminals of the master terminal A1. Then, speed, video, audio and control are described as the performance of each terminal. The speed refers to a data transfer speed, and the video describes compressed FCIF and QCIF. Both are compressed but QCIF is FCIF 4
It is transferred with a one-time information amount.

G.711, G.722 and G.728 for voice
Is the audio algorithm, the compression ratio is G.728,
G.722, G.711 are higher in order. LSD for control
(Low Speed Data) and MLP (Multi Layer Protocol) are set. The connection control procedure when communication is performed in a state where the performances of the terminals A1 to A4 are different from each other will be described with reference to FIG. here,
Control when the calling terminal A1 connects to the called terminal A2 will be described. First, from the transmitting terminal A1 to the receiving terminal A2
, A call is set by transmitting a telephone number to which the transmission capability of the transmitting terminal is added (S1). The receiving terminal A2 receives and analyzes the transmission capability of the transmitting terminal, and understands the capability of the transmitting terminal A1. Then, the receiving terminal A2 matches the transmission capability of the transmitting terminal A1, or transmits the own transmission capability to the transmitting terminal A1 if the transmission capability cannot be matched (S2).

Then, the receiving terminal A2 and the transmitting terminal A1
When the transmission capabilities of the terminals A1 and A2 match, the receiving terminal A2
(S3), and further responds (S3).
4). The calling terminal A1 that has received the call and the response confirms a response to the called terminal A2 (S5), and communication between both terminals is enabled (S6).

Next, FIG. 3 describes in detail the configuration of the terminal A1 shown in FIG. 1 in the system configuration of FIG. In FIG. 3, U2 to U3 are lines i / f, U5 is a demultiplexing circuit, and U6 is a video algorithm & bit scale CONVER.
TER, U7 are audio algorithms CONVERTER, U8 is video
CODEC & 4-split screen processing means, U9 is audio CODEC & MIXI
NG / voice detection processing means, U1 is composed of MAIN PROCESSOR. Here, the operation will be described with reference to FIG. The MAIN PROCESSOR (U1) analyzes the capabilities of the terminal A2, such as the transfer rate, the compression method, and the compression ratio, of the terminal A2 via the line i / f (U2). At the same time, the capabilities of the terminals A3 and A4 are also analyzed. And MAIN PROCESSOR
(U1) gives an instruction of a video resolution and a video algorithm to be received or transmitted to the video algorithm & bit scale CONVERTER (U6) via the demultiplexing circuit U5 for a video, for example, in order to match the capability of the terminal A1. The MAIN PROCESSOR (U1) gives the video CODEC & 4-split screen processing means the split mode in the case of a multipoint meeting, and gives the instruction of the single screen mode in the case of a standard meeting. Next, if it is a voice, the voice algorithm CONVER is sent through the demultiplexing circuit U5.
An instruction to convert to a G711 algorithm that can be transmitted or received is given to TER (U7). These operations are similarly performed for the terminals A3 and A4.

Therefore, when the terminal A1 communicates with a plurality of terminals having different capabilities, the communication is performed according to the capability of the lowest terminal. Further, as shown in FIG. 1, the terminal A1 is a master terminal that controls the terminals A2 to A4, and the terminals A2 to A4 are slave terminals of the terminal A1.

[0011]

As described above, according to the present invention, when communication is performed between different types of communication terminals via a digital communication line using voice, video and data, the capabilities of the respective terminals are analyzed and the analysis is performed. Since the communication is performed based on the determined capability, it is possible to perform communication between a plurality of terminals without changing the communication terminal capability of each other.

[Brief description of the drawings]

FIG. 1 shows a communication system according to an embodiment of the present invention;
It is a block diagram when applied to a video conference system.

FIG. 2 is a diagram illustrating a basic connection procedure at the time of connection between different models in the communication system according to an embodiment of the present invention.

FIG. 3 is a block diagram of a communication terminal according to the present invention, which enables connection between different models.

[Explanation of symbols]

 U1 MAIN PROCESSOR U2, U3, U4 Line i / f U5 Demultiplexing circuit U6 Video algorithm & bit scale CONVERTER U7 Audio algorithm CONVERTER U8 Video CODEC & Quad screen processing means U9 Audio CODEC & MIXING / Audio detection processing means

Claims (3)

[Claims] In a communication terminal in which communication is performed between terminals having different performances such as a transfer rate, a compression method and a compression ratio thereof, the performance of another terminal is analyzed, and the analysis result obtained by the analysis means is analyzed. A communication terminal comprising communication control means for performing communication control processing based on the communication terminal. 2. In a communication system in which terminals having different performances such as a transfer rate, a compression method and a compression ratio thereof communicate with each other, the own terminal analyzes the performance of another terminal and analyzes the performance by the analysis means. A communication system comprising communication control means for performing a communication control process based on the analyzed result. 3. The communication system according to claim 1, wherein said communication control means performs communication in accordance with a function of a terminal having low performance.