Method for converting speech code between differential speech agreement

A voice coding and protocol technology, applied in the field of voice coding and decoding, can solve the problems of large delay, unfavorable high-density integration of communication systems, and impact on voice quality, so as to reduce delay, achieve high-density integration, and avoid voice damage. Effect

Inactive Publication Date: 2008-07-30
HUAWEI TECH CO LTD
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Problems solved by technology

[0013] At present, this method of codec conversion is clear in thinking, simple and easy to implement, but there are still shortcomings in the implementation of this method: Disadvantage 1, the delay of the entire communication system is relatively large, because there is an algorithm when encoding and decoding linear data The inherent codec delay will increase the delay of the communication system; the second disadvantage is that the voice effect of the entire communication system is damaged, and the g.723.1 protocol encoding and g.729 protocol encoding are lossy compression of the voice signal , the decoding and encoding operations of this method are equivalent to two lossy compression operations, which have an impact on the voice quality; shortcoming three: the current method of codec conversion requires a decoding operation and a Coding operation, which requires a large amount of calculation and takes up more communication system resources, which is not conducive to the high-density integration of communication systems

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  • Method for converting speech code between differential speech agreement
  • Method for converting speech code between differential speech agreement
  • Method for converting speech code between differential speech agreement

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

[0030] Currently commonly used medium and low rate coding, such as g.723.1, g.729 and AMR protocols, all use the same mathematical model, and can be included in the coding technology of code-excited linear prediction (CELP). Specifically, these encoding methods have the following characteristics:

[0031] The first feature is based on the short-term stable characteristics of the speech signal, and the speech signal is processed in frames, and it is believed that in one frame, the speech signal can be represented by a signal system with lumped parameters;

[0032] Feature 2, during the encoding process, the excitation samples of the speech signal are extracted according to the speech sample information of the current frame, and the filter...

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Abstract

The method includes: A decoding the data bit stream according to the protocol, the index stream is obtained, finding the vector code in the index stream of the corresponding protocol, and the coefficient stream of the source code is obtained; B. Putting the coefficient stream as the target code protocol; C. searching the vector code in the coefficient stream to obtain the data bit stream of target code protocol finally.

Description

technical field [0001] The invention relates to the voice encoding and decoding technology of voice internet protocol (VOIP), in particular to a voice coding conversion method between different voice protocols. Background technique [0002] With the continuous development of technology based on Internet Protocol (IP), VOIP technology is used more and more. When using VOIP technology, different protocol networks often use different speech coding technologies for voice compression transmission. In order to realize the interconnection and intercommunication of different protocol networks, it is necessary to realize the conversion between different codec formats. For example: Some networks use the g.723.1 protocol, and some networks use the g.729 protocol. These two networks with different protocols will convert between codec formats when communicating. [0003] Such as figure 1 as shown, figure 1 A schematic diagram of codec conversion for two different protocol networks in ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/02G10L19/005
Inventor 吴建新
Owner HUAWEI TECH CO LTD
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