Dithering caching device and its management method
A jitter buffering and management method technology, applied in the field of network transmission, can solve problems such as voice quality degradation, and achieve the effects of increasing storage capacity, reducing overflow, and reducing underflow.
Inactive Publication Date: 2008-05-07
HUAWEI TECH CO LTD
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Problems solved by technology
[0007] The problem to be solved by the present invention is to provide a jitter buffer device and a jitter buffer management method to overcome the defects in the prior art that voice quality is reduced due to overflow or underflow
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Embodiment 1
[0041]Embodiment 1. In this embodiment, a jitter buffer device with three levels of jitter buffer is used, wherein the priority of level 1 jitter buffer is the highest, the length of each jitter buffer is 40 ms, and the jitter delay time is 40 ms; an RTP (Realtime Transfer Protocol, real-time transport protocol) packet arrival sequence such as image 3 As shown, the length of each RTP packet is 20ms.
[0042] refer to image 3 , the time when the first RTP data packet arrives at the jitter buffer device is 120ms, and its serial number is identified as 1; the time when the second RTP data packet arrives at the jitter buffer device is 145ms, and its serial number is identified as 2; The time of the jitter buffer device is 170ms, and its sequence number is 3; the time when the fourth RTP packet arrives at the jitter buffer is 205ms, and its sequence number is 4; the time for the fifth RTP packet to reach the jitter buffer is 215ms, Its sequence number is 5; the sixth RTP packet...
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The invention discloses a jitter buffer device, which comprises a plurality of jitter buffers with different priorities, and the plurality of jitter buffers are connected in parallel for storing received data packets; the jitter buffer with the highest priority is also used for sending Stored packets. The invention also discloses a jitter buffer management method. First, a plurality of jitter buffers receive data packets sequentially according to priorities, and then the jitter buffer with the highest priority sends the stored data packets according to the serial number identification of the data packets. The present invention increases the storage capacity of the jitter buffer and reduces the occurrence of overflow by connecting multiple jitter buffers in parallel; by moving the data packets received by the jitter buffers at all levels, the storage space of the jitter buffer with high priority is supplemented, reducing Moreover, the present invention does not perform time compression or time stretching on the data packets, so that no sound distortion occurs and the total delay time is not increased.
Description
technical field [0001] The invention relates to the technical field of network transmission, in particular to a jitter buffer device and a jitter buffer management method. Background technique [0002] With the wide application of IP telephony, people pay more and more attention to the voice quality of IP telephony, and there are three main factors affecting the quality of IP telephony: jitter, packet delay and packet loss. The jitter buffer technology is mainly used in the voice jitter processing, that is, a jitter buffer is set at the receiver. When the data packet arrives, it will first enter the jitter buffer for temporary storage, and then the jitter buffer will send the data packet to the decoder at a stable and gentle rate. . This buffer technology can effectively deal with voice jitter within a certain limit and improve sound quality. [0003] The task of the jitter buffer is to store data packets so as to cover the packet jitter, which has a very important impact ...
Claims
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IPC IPC(8): H04M1/253H04L29/06
Inventor 郑志猛
Owner HUAWEI TECH CO LTD