SYSTEM AND METHOD OF PRODUCING ADAPTIVE FIR DIGITAL FILTER WITH NON-LINEAR FREQUENCY RESOLUTION

摘要

An adaptive filter includes a memory (52) for storing test signals and is down loaded from a host computer via an optional interfacing device (54). A memory (56) is used for storing signals during processing. A clock (58) operates at a frequency which is a multiple of the desired system sampling frequencies. A program divider (60) generates various sampling frequencies from the clock (58). A digital signal processor (62) controls the operation of the system. Secondary digital signal processors (64) operate in parallel to provide the necessary computational power. A sigma-delta type analog to digital converter (66) operating at various sampling frequencies is connected to the input of the processor (62). A digital to analog converter (68) including an interpolation filter is connected to the output of the processor (62). A Bessel type low pass filter (70) is used to remove the high frequency components from the output signal.