Audio encoding method, audio decoding method, related device and communication system

Abstract

The embodiment of the invention discloses an audio encoding method, an audio decoding method, a related device and a communication system. The audio encoding method comprises the steps of receiving packet loss rate fed back by an audio decoder according to acquired code streams, switching encoding capacity to a multiple description state corresponding to the packet loss rate according to the packet loss rate fed back and encoding audio data by the multiple description state. The audio decoding method comprises the steps of acquiring multiple description packets sent by the audio encoder, increasing the value of a counter of the multiple description packet which contains multiple description quantity and packet description number by 1, acquiring the numerical value of the packet loss packet, and calling packet loss concealment when determining the numerical value of the counter of the multiple description packet or when the packet description number is not smaller than the multiple description quantity and the numerical number of the packet loss counter is not smaller than the multiple description quantity. The embodiment of the invention adjusts the packet loss resisting capacity of encoding code streams according to actual condition and reduces bandwidth occupied by invalid redundant information, thereby acquiring better output code stream quality.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an audio encoding method, an audio decoding method, a related device and a communication system. Background technique [0002] Communication networks and wireless networks based on packet switching, such as the third generation mobile communication network (The third Generation Mobile Telecommunication, 3G), in actual operation due to network congestion, channel interference and noise, etc., inevitably face the problem of packet loss , resulting in severely affected audio quality. [0003] There are generally two types of methods to reduce audio quality degradation caused by packet loss: encoder-based anti-packet loss algorithm and decoder-based anti-packet loss algorithm, which can also be called active anti-packet loss algorithm and passive anti-loss algorithm. package algorithm. Encoder-based anti-packet loss algorithms mainly include Automatic Repeat Request ...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, once a certain multi-description technique is used for encoding, the redundancy and anti-packet loss performance are determined. In actual applications, the redundancy cannot be adjusted to adapt to the network situation. When no packet loss occurs, the redundancy Redundancy wastes resources, and when the network situation deteriorates and continuous packet loss occurs, the anti-packet loss performance of the multi-description technology cannot be enhanced, resulting in a decline in audio quality

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