新型文字电话中数字滤波器的设计

摘要

文中介绍了应用在新型文字电话中的数字滤波器设计技术，这种电话使用了dsPIC33F系列微处理器。采用dsPIC单片机专用数字滤波器辅助设计软件包进行设计，把最佳CSD编码技术与Homer算法相结合对该滤波器进行优化。实验结果表明优化之后的滤波器大大缩短了滤波计算所需要的时间，更能满足系统实时通信的要求。%The design of a digital filter in a new textphone system based on dsPIC33F MCU is introduced. The customized digital filter-aided design package of dsPIC33F microcontroller was used to design the digital filter, and then the optimum CSD coding technology and Homer algorithm was combined to optimize the filter coefficients. The experiments showed that the filtering time was greatly reduced and the new digital filter satisfied the requirements of real-time communication system.