Research And Development Of Dynamic Signal Analyzer Based On DSP

The main work in this dissertation is do research and development on a kind of dynamic signal analyzer based on DSP. Four channels real-time analog signal acquisition and processing are realized by the design of DSP system program, digital signal processing program and CPLD coding address and dividing frequency program. The content is as follows.The high performance DSP chip TMS320C6713 has been studied deeply. On chip memory, external memory, Multi-channel Buffered Serial Ports and other hardware are configured by the tool of DSP/BIOS. The clock of DSP and peripheral equipment has been improved by the use of Phase-Locked-Loop. The control program of interface, which is the SPI or a frame-sync format serial interface provided by the serial 24-bit delta-sigma analog-to-digital converter for interfacing to the Multi-channel Buffered Serial Ports McBSP0 of TMS320C6713, has been designed to realize the serial communication between the DSP and analog-to-digital converter. The data is moved by EDMA, the communication with PC through USB2.0, HWI Module is used to manage the interrupt and solves the problem of interrupt nesting. The program of CPLD has implemented the function of coding address and dividing frequency.The basic algorithm of digital signal processing is realized on DSP, such as FFT, adding Hanning window, Flattop window, Exponential window, Force/Expon window, linear average power spectrum density estimation, FIR low-pass filter and decimation. The coding step of ZOOMFFT is introduced in detail. A numerical simulation is conducted by designing a signal with some little frequency resolution that can't be identified by FFT. After ZOOMFFT, the frequency resolution is high enough to distinguish the frequency spectrum in the sigmal.