A method for time-frequency multirate filtering

Abstract

A method for time-frequency multirate filtering of discrete-time signals is proposed. An input signal is nonuniformly decomposed into a number of subsignals, and the signals may be modified and combined on a specified time-frequency plane in real time processing. The modification process implies adaptive signal enhancement, filtering, movement and exchange over the time-frequency plane. The multirate filter is constructed based on parallel analysis and synthesis filter bank structures, and time-varying filtering may be achieved. By introducing a time-frequency plane and bifrequency maps, we formulate the multirate filters design completely. Design examples and experimental simulations are included.