Patent ID: 8515098

Claim:
A noise suppression device comprising: an audio detector that detects presence or absence of audio in an input signal; a counter that measures a length of detecting time during which the audio detector continuously detects the audio; a first noise spectrum estimator that estimates a noise spectrum contained in the input signal based on the input signal and detection result of the audio detector, thereby obtaining a first noise spectrum estimation value; a second noise spectrum estimator that estimates the noise spectrum based on the input signal regardless of the detection result of the audio detector, thereby obtaining a second noise spectrum estimation value; a noise spectrum calculator that calculates a final noise spectrum estimation value according to the length of detecting time of the audio measured by the counter and based on the first and second noise spectrum estimation values that are obtained as estimation results by the first and second noise spectrum estimators; a gain calculator that calculates a noise suppression gain based on the final noise spectrum estimation value; and a noise suppressor that suppresses noise contained in the input signal by applying the noise suppression gain to the input signal.