TMS320F28335 based multi-rate voice code device

Abstract

The invention relates to a TMS320F28335 based multi-rate voice code device, which comprises an analog-digital converter and a voice coder. The analog-digital converter is used for completing voice data analog-digital conversion, and the voice coder is used for completing voice coding and control. The vice coder adopts a DSP (digital signal processor) chip TMS320F28335, and the voice coder is connected with the analog-digital converter through an MCBSP (multichannel buffered serial port) interface to control voice data transceiving. The voice coder is capable of realizing coding and decoding inthree rates of 0.6kbps, 1.2kbps and 2.4kbps and directly determines coding and decoding rates according to configuration of external pin levels. In parameter extraction, unvoiced or voiced sound is determined through a support vector machine classifier with supervised learning, and the voice coder performs voice synthesis according to the determined unvoiced or voiced sound. Problems of accidental hoarseness and tone change in existing coding synthesis of voice can be effectively solved, various low-rate communication demands can be realized, and small size and low cost are realized.

Description

technical field [0001] The invention relates to a vocoder, in particular to a TMS320F28335-based multi-rate vocoder, belonging to the technical field of speech codec. Background technique [0002] In recent years, voice communication systems have developed rapidly, and voice codec algorithms with different rates need to be used to encode voice in a limited bandwidth to remove redundancy and transmit it accurately. Faced with an increasingly complex communication environment, the low-rate speech codec algorithm can effectively improve the capacity of the communication system while ensuring the quality of the synthesized speech. It is mainly used in military security communications, satellite communications and digital voice storage systems. [0003] At present, there are not many speech codec ASICs. Among them, the most famous one is the AMBE series vocoder chip produced by the American DVSI company, including AMBE-1000TM, AMBE-2000TM, AMBE-3000TM and other series. Among th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a multi-rate vocoder based on TMS320F28335, which has a compact structure and can effectively solve the problems of occasional hoarseness and tone shift in the existing coded synthesized speech, and can realize multiple A low-speed communication requirements, small size, low cost, safe and reliable

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