Publication Abstract

Quatieri, T.F., Dunn, R.B., and Hanna, T.E., A Subband Approach to Time-Scale Modification of Complex Acoustic Signals, IEEE Trans. Speech and Audio Processing, Vol. 3, No. 6, pp. 515-519, November 1995.

Abstract

A new approach to time-scale expansion of short-duration complex acoustic signals is introduced. Using a subband signal representation, channel phases are selected to preserve a desired time-scaled temporal envelope. The phase representation is derived from locations of events that occur within filter bank outputs. A frame-based generalization of the method imposes phase consistency across consecutive synthesis frames. The method is applied to synthetic and actual complex acoustic signals consisting of closely spaced rapidly-damped sine waves. Time-frequency resolution limitations are discussed.