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Research of Very Low Bit Rate Speech Codec Algorithm Based on DSP

Author: ZhouWenYong
Tutor: ChenMingYi
School: Central South University
Course: Control Science and Engineering
Keywords: LPC-10 vocoder Very Low Bit Rate Speech Coding Vector Quantization TMS320C6713
CLC: TN912.3
Type: Master's thesis
Year: 2011
Downloads: 33
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Abstract


Speech communication is one of the most basic, important and effective ways to get information, and the technology of speech communication has been widely used in the modern communication system. With the rapid development of modern communication system, the requirements for channel capacity and speech quality has been becoming stricter and stricter. In order to improve the using effectiveness and economy of the channel of communication system, the techniques of very low bit rate speech coding is becoming the essential developing orientation of the future communication system. At the same time, with the continuous development of the technology of DSP, the emergence of High-performance current DSP chip provides powerful hardware support to the realization of the communication system of very low bit rate speech coding. Therefore, the very low bit rate speech coding system, based on the hard ware platform of DSP, has been becoming one of the best choices for the future development.This thesis firstly carried detailed analysis on the key technologies such as the digital model of speech signal, the pretreatment of speech signal and linear prediction analysis and so on, studied the algorithm of LPC-10 vocoder and the simulation analysis has been conducted in Matlab. To further reduce the coding rate of LPC-10 vocoder, this thesis improved the algorithm of LPC-10 vocoder. Mainly according to the vector quantization analysis on the LP coefficient of vocoder and ways of three-frame joint coding, a kind of the very low bit rate speech codec of the improved LPC-10 vocoder at the rate of 800 b/s was presented in the thesis, whose simulation was carried out in the Matlab. Secondly, the TMS320C6713 DSK of Texas Instrument was taken as the hardware development platform and then the basic structure and working principle of TMS320C6713 DSK was described in detail. And the software design was conducted surrounding the core TMS320C6713 chip of TMS320C6713 DSK. At last, the software programming has been done in the Code Composer Studio3.1, and the real-time implementation of this kind of algorithm of very low bit rate speech coding is built. At the same time, the test of the system have been carried out. Through tested result, the system can availability implement encoding and decoding to the real-time voice. Quality of voice reconstructed is well understood.The improved LPC-10 vocoder still maintains the high speech quality, and the coding rate is extremely reduced, so as to reach the demand of extremely-low speech communication system. The system of very low bit rate speech codec studied in this thesis has set up a firm foundation for building embedded speech communication platform.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing
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