地下低频通信系统语音基带信号的设计

Design of voice baseband signal in underground low frequency communication system

对于矿井等特殊场合,有在地面与地下或者地下多点之间进行无线语音通信的广泛需求,这对地下事故救援、协同作业等有重要意义。为适应地下通信低频率载波对高压缩率数字语音信号的要求,文中设计了一种语音通信设备。设备以麦克风、扬声器作为语音收发端,通过CSP1027对语音信号进行A/D、D/A转换,选用AMBE-1000实现对量化的语音数据进行编码和解码,使用MCU进行系统初始化和语音的传输。实验证明,压缩的波特率低至2400bps时仍可以完成话质清晰、可靠的语音通信,适合作为地下低频通信的语音处理子系统。

For mines and other special occasions,there are among the ground and underground or underground multi extensive demand for wireless voice communications,this has important significance on the underground accident rescue, collaborative operation etc. To adapt to the underground communication low-frequency carrier for high compression rate digital voice signal requirements,this paper designs a voice communication device. The microphone,speaker as a voice transceiver,the speech signal A / D,D / A conversion by CSP1027,selection AMBE-1000 to achieve the quantized speech data encoding and decoding,use MCU for systems initialization and voice transmission. The Experiments show,compression of the baud rate as low as 2400 bps can still complete the words clear,reliable voice communication,suitable for underground low-frequency voice communications processing subsystem.