DESIGN AND IMPLEMENTATION OF EFFICIENT IIR NOTCH FILTERS WITH QUANTIZATION-ERROR FEEDBACK

Straightforward methods for the design of digital notch filters are pr esented. The design method is based on setting a zero of the filter at a notch frequency and placing a pole in its neighborhood such that th e notch width is narrow enough while keeping the group delay of the fi lter sufficiently flat. A technique for efficient and well-behaved imp lementation with fixed-point signal processors is advanced, based on t he use of quantization error feedback for roundoff noise reduction. Th e design approach is illustrated with numerical examples, and an assem bly-language program for the family of TMS320 signal processors is pro vided.