Aiming at the problem of poor transmission reliability of underwater acoustic voice signal,a moving underwater acoustic communication technology based on the Speex algorithm and confidence propagation was proposed.The technology consisted of two parts,compression and reconstruction of the voice signal and digital communication.In voice signal processing,the structure of the speech signal was separated from the informa-tion.The Speex algorithm was used to divide the whole frame into multiple subframes,and the subframes were encoded by the synthesis analysis technique.The structure of the speech signal was separated from the informa-tion,and only the voice information was transmitted.The compression ratio of the voice information was in-creased from 7.60 to 8.42,which improved the transmission efficiency.The excitation signal was calculated by the receiving parameters,and the speech signal was reconstructed by the synthetic filter.In digital communica-tion,the superimposed training(ST)scheme was adopted to improve the tracking ability of time-varying under-water acoustic channels.Based on confidence propagation,the bidirectional channel estimation(BCE)algorithm was used to achieve accurate channel estimation for each segment.Moreover,the Speex algorithm,ST scheme,BCE algorithm,and Turbo equalization were combined to build an underwater acoustic voice communication sys-tem,which improved the reliability of underwater acoustic voice signal transmission.Finally,the effectiveness of the proposed technique was verified by computer simulation and experimental results with horizontal distance of 5.5 km between the transmitter and receiver in Jiaozhou Bay.
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