Patent ID: 8989403
Filing Date: 2015-03-24
Classification: G10L

Abstract:
1. A noise suppression device including a time-to-frequency converting unit for converting an input signal on a time domain into power spectra and phase spectra which are signals on a frequency domain, a noise spectrum estimating unit for estimating a noise spectrum carried on said input signal, a noise suppression amount generating unit for calculating an amount of noise suppression by using said power spectra and said noise spectra, a noise suppressing unit for suppressing amplitudes of said power spectra according to said amount of noise suppression, and a frequency-to-time converting unit for converting said phase spectra and said power spectra whose amplitudes are suppressed by said noise suppressing unit into signals on a time domain, wherein said noise suppression device has a representative component generating unit for combining a plurality of power spectra into which said input signal is converted by said time-to-frequency converting unit into each group, and for selecting a power spectrum having a larger value from among said plurality of power spectra in said each group on a priority basis to define the power spectrum selected thereby as a representative power spectrum, and said noise suppression amount generating unit calculates the amount of noise suppression by using said representative power spectrum.