DEVICE AND METHOD FOR SPEECH DETECTION

摘要

PROBLEM TO BE SOLVED: To stably detect a signal containing even a voice on which noise of large power is superposed by performing the detection by comparing acoustic feature quantities of a noise signal and a signal containing a voice signal. SOLUTION: An acoustic feature quantity extraction part 13 finds an acoustic feature quantity vector according to an inputted digital signal. A noise feature quantity distribution learning part 17 finds a distribution of feature quantities in noise environment according to an inputted noise signal and stores it in a feature quantity distribution memory 18. A probability calculation part 14 compares the acoustic feature quantity of the input signal with those of the noise signal by using the acoustic feature quantity vector of the input signal and a distribution of acoustic feature quantities of the noise signal stored in a feature quantity distribution memory 18. The comparison result of the probability calculation part 14 is supplied to a voice section detection part 15. The voice section detection part 15 detects the section of the signal containing the voice signal according to the comparison result.