DEVICE, METHOD AND PROGRAM OF SPEECH RECOGNITION

摘要

PROBLEM TO BE SOLVED: To provide constitution of a stout speech recognition device with high recognition performance even under environment of great noise. SOLUTION: A short-time signal 11 of a speech signal 01 by unit of frame is calculated by a short-time signal segmentation section 10, an amplitude spectrum 21, an amplitude spectrum 22 of a noise section and power 23 of speech are calculated by an amplitude spectrum calculation part 20. A smoothing controller 40 calculates a smoothing level 41 based on speech noise ratio between the power 23 of speech and power 32 of noise calculated by a noise amplitude spectrum estimation section 30. A spectrum smoothing section 50 smoothes the amplitude spectrum 21 in the frequency direction based on the smoothing level 41, outputs the smoothed amplitude spectrum 51 and a noise subtraction section 60 outputs a corrected amplitude spectrum 61b by subtracting a noise amplitude spectrum 31 calculated by the noise amplitude spectrum estimation section 30 from the smoothed amplitude spectrum 51. COPYRIGHT: (C)2004,JPO