Method of realizing dynamic adjusting dithered buffer in procedure of voice transmission

A technology of jitter buffering and voice transmission, applied in transmission systems, digital transmission systems, electrical components, etc., can solve problems affecting the effect of static JB schemes and voice packet playback time, and achieve improved voice transmission effects and better anti-jitter effects , Improve the effect of voice quality

Inactive Publication Date: 2005-06-15
HUAWEI TECH CO LTD
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Problems solved by technology

[0008] Another disadvantage of the static JB scheme is that the playback time of subsequent voice packets is affected by the first voice packet
because figure 2 The dotted line in is determined by the arrival time of the first packet and the fixed JB depth, and the arrival time of the first packet is also random, so that the effect of the static JB scheme will be affected by the early or late arrival of the first packet

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  • Method of realizing dynamic adjusting dithered buffer in procedure of voice transmission
  • Method of realizing dynamic adjusting dithered buffer in procedure of voice transmission
  • Method of realizing dynamic adjusting dithered buffer in procedure of voice transmission

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Embodiment Construction

[0051] The present invention proposes a method for dynamically adjusting the jitter buffer in the voice transmission process. The method firstly proposes the concept of dynamically adjusting the JB for the existing static JB. Secondly, the method provides a method based on the delay and Jitter dynamically adjusts the depth of JB at the receiving end, which takes into account the different requirements for the depth of JB caused by jitter and delay during voice transmission in the network, and makes corresponding adjustments to effectively improve the quality of voice transmission , for IP networks whose delay changes cannot be predicted, dynamic JB can achieve a good anti-jitter effect and reduce unnecessary packet loss rate or delay. If the JB depth needs to be adjusted only according to the change of the average jitter, then when the average delay of the network increases but the average jitter remains unchanged, there is no need to adjust the JB depth. In fact, due to the in...

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Abstract

Through real time statistics of average time delay and average dithering, the method reflects state of current network correctly. The method adjusts JB depth in real time based on state of average time delay and average dithering in everchanging network. Thus, anti dithering mechanism of reception gateway is able to adapt variable IP network dynamically, and reduces rate of packet loss in procedure of transferring voice through network. Comparing with technical scheme of static JB, and proved through tested result, the invention provides better anti dithering effect in procedure of transferring voice, raises voice quality of VOIP under relative poor condition of network quality.

Description

technical field [0001] The invention relates to the technical field of voice transmission, in particular to a method for dynamically adjusting jitter buffer during voice transmission. Background technique [0002] With the popularity of the Internet (Internet) and the continuous maturity of technology, it is possible to transmit traditional voice information on the Internet. Therefore, various technologies for VOIP (Voice over Internet Protocol) services have emerged as the times require. The main problems of transmitting voice packets through the current IP (Internet Protocol) network are: the inherent delay, jitter, packet loss, and disorder in the IP network will affect the voice quality of VOIP. The so-called network jitter, that is, delay time-varying. [0003] In the application of VOIP, the DSP (Digital Signal Processing) of the sending gateway sends encoded and compressed voice packets at the same time interval, such as 10 milliseconds, 20 milliseconds, and 30 milli...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L49/9023
Inventor 王麒樊荣
Owner HUAWEI TECH CO LTD
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