Title :
Necessary and sufficient conditions for time-invariant operations of N-path filters
Author :
Wang, Hongyi ; Tantaratana, Sawasd
Author_Institution :
Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA
fDate :
5/1/1991 12:00:00 AM
Abstract :
Necessary and sufficient conditions on the modulating functions for a digital N-path filter (NPF) to be shift-invariant are obtained. Previously used conditions are sufficient but not necessary. These new conditions allow NPFs to be designed with the smallest number of paths without the need of pre- and postfiltering by ideal low-pass filters. Some design examples are presented
Keywords :
digital filters; filtering and prediction theory; N-path filters; modulating functions; shift-invariant; time-invariant operations; Acoustic signal processing; Adaptive signal processing; Digital filters; Finite impulse response filter; Lattices; Nonlinear filters; Signal processing; Signal processing algorithms; Speech processing; Sufficient conditions;
Journal_Title :
Circuits and Systems, IEEE Transactions on
