A SUBBAND APPROACH TO TIME-SCALE EXPANSION OF COMPLEX ACOUSTIC-SIGNALS

A new approach to time-scale expansion of short-duration complex acous tic signals is introduced. Using a subband signal representation, chan nel phases are selected to preserve a desired time-sealed temporal env elope. The phase representation is derived from locations of events th at occur within filter bank outputs. A frame-based generalization of t he method imposes phase consistency across consecutive synthesis frame s. The method is applied to synthetic and actual complex acoustic sign als consisting of closely spaced rapidly damped sine waves. Time-frequ ency resolution limitations are discussed.