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Coding and decoding device and method of ultralow-bit-rate speech

A coding device and coding and decoding technology, which are applied in the field of information and signal processing, can solve problems such as high bit error rate of the system and unstable conditions of ultrashort wave communication channels

Active Publication Date: 2013-09-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In addition, the channel conditions of military short-wave and ultra-short-wave communications are unstable, and the system bit error rate is relatively high

Method used

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  • Coding and decoding device and method of ultralow-bit-rate speech

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Embodiment Construction

[0117] The technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all examples. Based on the present invention All other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0118] In order to facilitate the understanding of the embodiments of the present invention, specific embodiments will be taken as examples for further explanation below in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

[0119] The technical solution of the present invention includes two parts: an encoder and a decoder: the encoder includes a speech signal preprocessing module, a pitch pe...

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Abstract

The invention provides an improved coding and decoding device and method based on the linear predictive parameter coding basic principle. Intra-frame and inter-frame correlations of parameters and the correlations among all the parameters are fully utilized, and all the parameters of a coder are compressed by the utilization of the vector quantization technology; while the compression is performed, the auditory perception characteristic of the human ears is fully utilized to perform quantization or inverse quantization on all the parameters by the utilization of different weighing distortion measurements, so that data are effectively compressed on the premise that the auditory sense quality of the human ears is not affected. On the premise that speech quality is ensured, the coding and decoding device and method of ultralow-bit-rate speech achieves coding and decoding of the ultralow-bit-rate speech with algorithm complexity as low as possible while working at the bit rate of 600bps and the bit rate of 300bps.

Description

technical field [0001] The invention belongs to the technical field of information and signal processing, and mainly relates to signal processing and codec technology, in particular to an extremely low code rate speech codec device and a codec method. Background technique [0002] Voice is one of the main means for human to exchange information, and voice transmission has always occupied an important position in the communication system. In order to improve the effectiveness of the digital transmission of the voice signal, the voice is usually compressed and encoded. The significance of speech compression coding is to remove redundant information in speech information, reduce transmission bit rate or storage space. The initial development stage of speech coding is 16Kbps ~ 64Kbps waveform coding, such as pulse code modulation (Pulse-code modulation, PCM), adaptive delta modulation (Adaptive delta modulation, ADM), adaptive differential pulse code modulation (Adaptive differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/06
Inventor 江文斌王月明陆桢骐蒋三新刘佩林
Owner SHANGHAI JIAO TONG UNIV
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