Patent ID: 9530429
Filing Date: 2016-12-27
CPC Classification: G10L,H04R

Claim Text:
1. A reverberation suppression apparatus comprising: an instantaneous value calculation unit that calculates an instantaneous value/instantaneous values in an envelope of values correlating with the absolute value or the square of an input signal; a reverberation estimation unit that calculates an exponential moving average of the instantaneous value(s) as an estimated reverberation component; a gain derivation unit that derives a gain corresponding to the input signal according to the estimated reverberation component and the instantaneous value(s) for a period of time during which the each instantaneous value is larger than the estimated reverberation component, and derives a lower limit of the gain as the gain corresponding to the input signal for a period of time during which the each instantaneous value is smaller than the estimated reverberation component; a smoothing unit that performs a smoothing process on the gain derived by the gain derivation unit; and a gain processing unit that applies the gain after the smoothing process to amplitude adjustment of the input signal.