水声语音通信中信源编码鲁棒性的研究

Source Coding Robustness for Underwater Speech Communication

水声信道中常常伴随着比无线电信道更强的噪声背景、强烈的声吸收和散射,特别是多途传播的影响,使声信号码元更易受到干扰.本文从水声信道语音通信的需要出发,研究了目前国际通行的语音信号信源编码的鲁棒性问题,提出了增加鲁棒性的必要性,给出了必要的数学定义,以PCM和CS-ACELP编码为例进行了定量的研究.结果显示,在信源编码中适当加入冗余保护码对提高整个通信系统的鲁棒性是必要的和有益的.

The underwater acoustic channel is often accompanied by high level noise background, strong absorption, reverberation and scattering, especially, multi-path propagation causes serious intersymbol interference. This paper, from practical requirements on underwater speech communication, have quantitatively studied the coding robustness of the traditional PCM and newest CS_ACELD speech signal source coding. A necessary definition has been given. The results show that adding some suitable protecting codes to source coding is necessary and benefit to enhance the robustness. 