基于DSP电键信号采集预处理系统的设计

介绍了基于DSP（数字信号处理器）的电键信号采集预处理系统和该系统的基本原理，给出了它的硬件原理图和软件设计程序框图。系统利用Philips公司的PDIUSBD12作为USB接口芯片，实现了主机与下位机的数据通信，采用CPLD（复杂可编程逻辑器件），克服了DSPI／O接口功能弱的缺点，提高了DSP的控制能力，以ADC0809为A／D芯片对电键信号进行采集，同时采用TMS320C5402作为核心芯片，完成控制与数据处理，设计DSP算法来实现USB固件设计及中断源的处理，最后介绍了USB驱动程序的编写。

Design of Key Signal Acquisition and Preprocessing System Based on DSP

This paper introduces a key eration principle is presented and the block signal acquisition and preprocessing system based on DSP. The opdiagram of hardware and program flow chart are given. The system utilizes PDIUSBD12 chip as the USB interface, which achieves high speed communication between the host computer and the subordinate machine. Adopting CPLD design, the weakness of DSP I/O interface function is overcome, and the capability of DSP control is enhanced. ADC0809 is used as A/D chip, which realizes the acquisition of key signal. The system uses TMS320C5402 as its core chip, which can accomplish the function of control and digital processing. The DSP software realizes the firmware program of USB chip. Finally the design of USB driver is briefly described.