Patent ID: 7957964
Filing Date: 2011-06-07
Classification: G10L

Abstract:
1. A noise suppression apparatus comprising a processor and computer-executable code configured to execute: dividing a sound having superimposed noise into a plurality of first frames having a first frame length; converting the first frames into a plurality of first spectrums; identifying each of the first frames as a sound section or a non-sound section; estimating a noise spectrum using a first spectrum of a first frame in a section identified as the non-sound section; dividing the sound into a plurality of second frames each having a second frame length that is longer than the first frame length; converting the second frames into a plurality of second spectrums; smoothing the second spectrums in a frequency direction; calculating gain based on the smoothed second spectrums and the noise spectrum; and performing spectral subtraction by multiplying the first spectrums by the gain.