Coding method and decoding method for voice data

A voice data and coding method technology, applied in the field of voice data coding and decoding, can solve the problems of voice quality reduction, high accuracy, and difficulty in application, and achieve the effects of effective transmission, guaranteed sound quality, and high robustness.

Active Publication Date: 2013-08-14
北京中科欧科科技有限公司
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Problems solved by technology

If the voice transmission rate is further reduced, the sound quality of the voice will be significantly reduced, and this method will be difficult to apply
The transmission rate can be reduced to less than 200bps after the corresponding text information is recognized by the traditional speech recognition system, but it is difficult to guarantee a high accuracy rate for the text recognized by this method, and it is difficult to retain the characteristics of the speaker

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  • Coding method and decoding method for voice data
  • Coding method and decoding method for voice data
  • Coding method and decoding method for voice data

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0027] The invention proposes a parameter-based speech data encoding and decoding mechanism. The mechanism is divided into an encoding method and a d...

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Abstract

The invention provides a coding method and a decoding method for voice data. The coding method comprises the following steps: acquiring an original audio frequency, obtaining voice segment data by eliminating non-voice data in the original audio frequency through end point detection; extracting a spectrum parameter, a fundamental sound period, and other parameters for each frame of the voice data, calculating a gain mean of continuous multi-frame voice data, conducting vector quantization for the spectrum parameter, and nonlinearity quantification for the fundamental sound period and the gain mean through a vector code book; and conducting coding for various quantified voice parameters to generate a voice data package. The decoding method comprises the following steps: conducting decoding for a received voice data package; extracting a spectrum parameter, the fundamental sound period, the gain mean, and other parameters; conducting forecasting for an excitation parameter and an energy changing track through the parameters; and finally, synthetizing voice through a vocoder. The method can keep a higher voice quality at extremely low coding rate.

Description

technical field [0001] The invention relates to the field of intelligent information processing, in particular to a method for encoding and decoding voice data. Background technique [0002] Speech is one of the main means for human to exchange information, and speech coding has always occupied an important position in the communication system. The amount of voice data is very large, which is not convenient for direct transmission and storage processing. At the same time, many fields have high requirements for voice compression transmission rate. Therefore, reasonable and effective processing of voice must be carried out to reduce the transmission rate and storage capacity of voice signals. That is to carry out voice compression coding, so very low-rate voice coding has attracted more and more attention. There is a lot of information redundancy in the voice signal, and every bit of compression means saving money. Low-speed digital voice transmission has great practical value...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/032G10L19/083G10L25/93G10L25/87G10L15/06
Inventor 陶建华刘斌莫福源
Owner 北京中科欧科科技有限公司
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