A new method for designing IIR multiple notch filters is presented, wh
ich satisfies the notch frequency specifications exactly and realizes
3 dB rejection bandwidths which are lower than those specified. An all
pass filter-based realization has been worked out to make the design r
elatively insensitive to coefficient inaccuracies. Illustrative exampl
es are given. (C) 1998 John Wiley & Sons, Ltd.