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Speech coding method based on multiple description lattice type vector quantization technology

A technology of vector quantization and speech coding, which is applied in the field of network communication and communication, can solve the problems of packet loss affecting system performance, etc., and achieve the effects of saving storage space, improving stability, and reducing algorithm complexity

Inactive Publication Date: 2008-01-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0006] The present invention aims to solve the problem that packet loss affects system performance in the process of packet voice transmission, and provides a multi-description speech coding method based on multi-description lattice vector quantization, which involves lattice vector quantization of weighted speech signals, and The quantized index is labeled with multiple descriptions

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  • Speech coding method based on multiple description lattice type vector quantization technology
  • Speech coding method based on multiple description lattice type vector quantization technology
  • Speech coding method based on multiple description lattice type vector quantization technology

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Embodiment Construction

[0021] The present invention will be further introduced below in conjunction with the accompanying drawings and embodiments. The present invention mainly aims at the problem of how to improve the transmission quality of the voice signal on the packet network. Suitable for packet voice transmission.

[0022] As shown in FIG. 1 , the method of the present invention includes processing on the encoding end and the decoding end. The encoding end includes perceptual weighting, time-frequency transformation, energy adjustment and lattice vector quantization, and multi-description annotation; while the decoding end includes parameter analysis, energy adjustment and spectrum vector recovery, time-frequency inverse transformation, and deweighting. The implementation details of each part are as follows:

[0023] As shown in Figure 1, the encoding end first needs to weight the speech signal to obtain a weighted speech signal, while the opposite de-weighting process needs to be performed...

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Abstract

The invention relates to a speech coding method based on multiple description of grid vector quantization, which belongs to the field of communication technology and is mainly applied for group speech transmission. The method first of all conducts LPC analysis on speech signal, carries out perception weighting and transfers the weighted speech signal to a frequency domain. The signal is decomposed into vector in the frequency domain and is quantized with grid vector quantization method. Finally, the quantized grid point is decomposed into two descriptions (index of corresponding sub-gird point) according to the marking method of multiple description grid vector quantization and is transmitted in a signal channel, so as to enhance the transmission reliability of the system. Because this method is based on grid quantization technology, the complexity and encoding time delay are much lower.

Description

technical field [0001] The invention relates to the field of communication, in particular to a speech coding method of multi-description lattice vector quantization technology, and belongs to the field of network communication. Background technique [0002] Multiple description coding was proposed by Gersho, Ozarow et al. at the Shannon Information Theory Conference in 1979. It encodes a single signal into two (or more) separate bit streams called descriptions. Each description can be decoded individually, and the original signal with acceptable quality is obtained; and there is complementary information between multiple descriptions, and the quality of the decoded signal is gradually improved as the number of correctly received descriptions increases. . It is worth noting that multi-description coding is different from conventional scalable coding. The basic layer encoded by conventional methods is crucial. If the basic layer is lost, the rest of the other bit streams wil...

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Application Information

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IPC IPC(8): G10L19/00G10L19/02G10L19/038
Inventor 匡镜明郎玥赵胜辉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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