Patent ID: 7412379

Claim:
A method of time scale modifying a signal, the method comprising the acts of: defining individual frame segments within the signal, analyzing the individual frame segments to determine a signal type in each frame segment, applying a first algorithm to a determined first signal type and a second different algorithm to a determined second signal type, wherein the first and second algorithms are time scale modification algorithms and the method is used for time scale modification of the signal, and wherein the first signal type is a voiced signal segment and wherein the second signal type is an un-voiced signal segment, splitting the un-voiced speech signal in a first portion and a second portion, and inserting noise in between the first portion and the second portion to obtain a time scale expanded signal, wherein the noise is synthetic noise with a spectral shape equivalent to the spectral shape of the first and second portions of the signal and wherein the inserted noise is excised from the middle of a previously synthesized noise sequence.