【摘要】 提出并实现一种16 kbps连续可变斜率增量调制(CVSD)编码与64 kbps A律脉冲编码调制(PCM)的全数字转换技术。该转换技术满足单值对应准则和多次转接无误差累计特性。解决了CVSD编解码器和PCM编解码器全数字化问题,实现了基于多径搜索算法的PCM-CVSD转换器的数字化。该方案可用来解决CVSD通信网和PCM通信网的衔接问题,实际运行效果良好。更多还原

【Abstract】 Digital code conversion technology between 16 kbps Continuously Variable Slope Delta(CVSD) modulation and 64 kbps A-law Pulse Code Modulation(PCM) is proposed and designed,which eliminates cumulative distortion regardless of the number of the tandem transcending.The problems about code conversion between CVSD and PCM are resolved.The whole digital code conversion of PCM-CVSD is realized based on Field Programmable Gate Array(FPGA) with Verilog language.The technology can enhance the performance of the telephone network linking between the special network and civil network.更多还原