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Frogman Speech Coding Technology and Its Implementation Based on DSP

Author: BaiYe
Tutor: ShengXueLi
School: Harbin Engineering University
Course: Signal and Information Processing
Keywords: low bit rate speech coding MELP contact conduction microphone speechenhancement DSP
CLC: TN929.3
Type: Master's thesis
Year: 2013
Downloads: 20
Quote: 0
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Abstract


Frogman underwater speech communication system is mainly used to communicatebetween frogman and frogman, frogman and ship. Speech coding technology is the necessarycomponent of this system, and guarantees the transmission of underwater speech signalsuccessfully. For the influence of underwater acoustic channel and the limit of high data ratefor underwater acoustic communication technology, the low bit rate speech coding is neededin the limited communication rate.In this paper, frogman speech signal is acquired by contact conduction microphone, andits characteristics are analyzed. The low bit rate speech coding of2.4kbps is achieved bymixed excitation linear prediction (MELP) algorithm, and developed in the DSP platform.The subspace-based speech enhancement is introduced to improve auditory quality ofunderwater speech communication. The technology of MELP speech coding has the form ofmixed excitation and the idea of multiband. The basic principles of coding and encoding aresimulated by MATLAB, and developed in the TMS320C6747DSP. The results show themain characteristics of speaker are retained in the synthesized speech signal. In addition, thecapability of avoiding interference of frogman speech signal is improved by contactconduction microphone, the noise component in the noisy signal is eliminated by subspaceapproach of speech enhancement. The constrained estimator is improved in the time andfrequency domains, and the noise elimination has wider scope and more significant effect.The technologies of MELP speech coding, underwater acoustic communication andsubspace-based speech enhancement are combined, and the system is experimented in thelaboratory and lake. The transmission of speech signal is achieved in the surface acousticchannel, and the results show the synthesized speech has well quality of intelligibility andclarity, which satisfies the demand of underwater speech coding.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Underwater communication ( Sonar communication)
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