Data transmission method and data trasmission system

Abstract

A data transmission method and a data transmission system not requiring a large delay unit for multiplexing and composition and capable of reducing the hardware scale, wherein when transmitting data among multiple points from a plurality of terminals arranged in a network, when the data at multiple points are transmitted to the terminals, in the network, identical packets are added different time stamps in accordance with the transmission delays, whereby the data shifted in accordance with the transmission delays are transmitted.

Description

RELATED APPLICATION DATA [0001] The present application claims priority to Japanese Application No. P2000-081851 filed Mar. 17, 2000, which application is incorporated herein by reference to the extent permitted by law. BACKGROUND OF THE INVENTION [0002] The present invention relates to a data transmission method and a data transmission system for transmitting a plurality of streams over a network when communicating, streaming, etc. among a plurality of terminals. [0003] Below, an explanation will be made of a conventional method for transmitting a plurality of streams over a network when communicating, streaming, etc. among a plurality of terminals in relation to the drawings. [0004]FIG. 1 is a view of an example of a television (TV) conference system. [0005] In this TV conference system, a conference is simultaneously carried out by using five terminals of a terminal 1 to a terminal 5 with cameras CMR mounted thereon. [0006] The terminals 1 to 5 are connected via switches SW1 to S...

AI Technical Summary

Benefits of technology

[0108] An object of the present invention is to provide a data transmission method and a data transmission system capable of reducing traffic of signals flowing over the entire network.

[0109] A second object of the present invention is to provide a data transmission method and a data transmission system not requiring a large delay unit in the MCU performing the multiplexing and composition and therefore capable of reducing the hardware size.

[0110] A third object of the present invention is to provide a data transmission method and a data transmission system achieving an improvement of a utilization efficiency of the transmission bands and a reduction of the transmission cost.

Problems solved by technology

In the Internet, the band is often not compensated.

Therefore, it is an area where the quality of service (QoS) is low.

These signals are transmitted over bands having the same QoS, so the transmission cost becomes high.

Further, from the viewpoint of effective utilization of the bands, the utilization efficiency was low.

In the case of audio and video, this will result in lip-sync deviation and an extremely strange feeling.

When communicating by utilizing only a network having a low QoS, there is a possibility of large jitters or large delay occurring in accordance with the state of congestion of the network.

Further, if a large delay is inserted, in the communication, a deviation occurs in the responses to each other and conversation ends up becoming impossible.

Further, if a state of congestion occurs in the network, the audio will be interrupted.

Not only it is then difficult to use this system as a communication tool, but also there is the problem that once congestion occurs, the system cannot be restored for a long time.

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