Patent ID: 7480614
Filing Date: 2009-01-20
Classification: G10L

Abstract:
1. An energy feature extraction method for noisy speech recognition, comprising: a noisy speech energy computation step for computing a noisy speech energy of an input noisy speech; a noise energy estimation step for estimating a noise energy in the input noisy speech through the noisy speech energy and an energy dynamic range ratio which is defined as a ratio of maximum frame energy to minimum frame energy in speech, thereby obtaining an estimated noise energy ê where E y [t] is the noisy speech energy, T is the number of speech frames, r x is the energy dynamic range ratio of clean speech; a speech energy estimation step in which the estimated noise energy is subtracted from the noisy speech energy to obtain an estimated clean speech energy; an energy feature computation step for performing delta operation on log of the estimated clean speech energy to determine differential coefficient for automatic speech recognition; and an output step for outputting the differential coefficient determined in the energy feature computation step to perform noisy speech recognition.