Patent ID: 7117150
Filing Date: 2006-10-03
Classification: G10L

Abstract:
1. 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; (b) calculating a change quantity from said feature quantity, said change quantity corresponds to a variation in time of said feature quantity; (c) discriminating the voice section from the non-voice section, using a long-time average of said change quantity, said long-time average of said change quantity is obtained by inputting said change quantity to filters; and (d) repeating steps (a)–(c) for every fixed time length in the voice signal, wherein at least one of a line spectral frequency, a whole band energy, a low band energy and a zero cross number is used for said feature quantity, and wherein at least one of a line spectral frequency that is calculated from a linear predictive coefficient decoded by means of a voice decoding method, a whole band energy, a low band energy and a zero cross number that are calculated from a regenerative voice signal output in the past by means of said voice decoding method are used.