Design of FIR Digital Filter Based on SRFFT Arithmetic and Realization with ADSP21160
Kai Long · Modern Electronic Technique · 2005
The paper design a FIR digital filter base on SRFFT arithmetic.First,the input signal is transformed digtal signal by A/D ,and the digtal signal is divided into fixed-length array use by way of overlap addition.And then the fixed-length array is transformed to the frequency-area from the time-area with SRFFT arithmetic,and is transformed back to the time-area with SRIFFT,thus we attain the result of filter.This FIR digital filter base on SRFFT arithmetic decreas mass the operate degrees of complex-multiply and complex-addition and improve the efficiency of the filter than any others FFT arithmetic.The filter of this article is a variable digtal filter that a length 400 to 500 ranks.The input singal is complex-data that the speed of sample is 10 MHz. According to the system processing request,the system adopts 2 slices of high speed floats chips ADSP21160 to constitute multi- processors of parallel system to realize the design of high-speed FIR digtal filter.