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Anti-noise low-bitrate speech coding method and decoding method

A coding method and non-voice 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 goal of suppressing noise interference, improving voice quality, and high robustness. Effect

Inactive Publication Date: 2015-01-28
东莞市凌进精密制造有限公司
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AI Technical Summary

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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  • Anti-noise low-bitrate speech coding method and decoding method
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  • Anti-noise low-bitrate speech coding method and decoding method

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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 described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0030] 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.

[0031] 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 an audio data coding method and a decoding method. The coding method comprises the steps that original audio is obtained, non-speech data in the original audio is removed through detection of an end point, and speech section data are obtained; pre-enhancement is carried out on each frame of speech data, and the speech energy is calculated after the interference of part of noise is removed; the pitch period of each frame of speech data is calculated by analyzing the period characteristic and the pure and turbid state of all sub-bands, and spectrum parameters are enhanced through a multi-layer neural network model; speech frame clustering is carried out through the spectrum parameters, the pitch periods and energy, and a speech section is composed of adjacent frames with the similar characteristics; after the mean value characteristics of all the sections of speech spectrum parameters, the pitch periods and the energy and the number of frames of each section of speech are calculated, quantization is carried out; quantified various speech parameters are coded, and a speech data package is generated. The high speech quality can be kept under the condition of the extremely low code rate.

Description

technical field [0001] The invention relates to the field of intelligent information processing, in particular to a coding method and a decoding method of 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...

Claims

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Application Information

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IPC IPC(8): G10L19/02G10L21/02
Inventor 陈世文
Owner 东莞市凌进精密制造有限公司
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