CVSD仿真及其在某地空电台语音终端中的应用

The Simulation of CVSD Algorithm and its Application to Voice Processing Unit of a Certain Ground-to-air Transmitter-receiver

简要分析了连续可变斜率增量(CVSD)调制的编译码原理及实现算法,并通过选取合适的参数在MATLAB中对其算法进行了仿真。仿真结果表明,量阶Δ能够自动地随输入信号平均斜率的大小而连续变化,译码输出信号实现了对输入信号的理想逼近。介绍了基于CVSD编码芯片FX609J的某型地空电台的语音单元方案的设计和实现。实验证明,由FX609J实现编译码的语音单元使地空电台的话音质量、抗误码能力等性能都有了明显改善。

The encoder-decoder principle and the algorithm based on the continuously variable slope delta （CVSD） modulation is briefly analyzed. And with preferable character, the algorithm of CVSD is simulated in MATLAB. The result of the simulation show that the quantified phase （A） continuously changes with the mean value of the slope in the signal, which ideally approaches to the input signal. And the project about the voice processing unit based on the CVSD chip FX609J has been designed and realized which used in a type of Ground-to-Air Transmitter-Receiver in this paper. It has been proved by experiment that the Voice processing unit in which the function of the encoder-decoder is implemented by the FX609J chip has greatly improved the performances of the ground-to-air transmitter-receiver including the quality of the voice,the capability of reducing bit error rate etc.