Patent ID: 7698135

Claim:
A voice detecting method discriminating a voice section from a non-voice section for every fixed time length for a voice signal comprising the steps of: (a) calculating a feature quantity from said voice signal input by a feature quantity calculating circuit; (b) calculating a change quantity from said feature quantity by a change quantity calculating circuit, said change quantity corresponds to a variation in time of said feature quantity; (c) inputting the change quantity to one or more filters; (d) discriminating the voice section from the non-voice section by a determining circuit, using a long-time average of said change quantity, said long-time average of said change quantity is obtained by said one or more filters; and (e) repeating steps (a)-(d) for every fixed time length in the voice signal, wherein the change quantity of said feature quantity is calculated by using said feature quantity and a said long-time average thereof.