Patent ID: 9449616
Filing Date: 2016-09-20
CPC Classification: G10L

Claim Text:
1. A noise reduction system that reduces noise contained in a sound mixed with noise, the noise reduction system comprising: hardware, including a processor and memory; a first noise estimating unit implemented at least by the hardware and that estimates a stationary noise component contained in a first input signal and outputs a first estimated noise; a first noise reduction unit implemented at least by the hardware and that outputs a first estimated sound in which the stationary noise component is reduced from the first input signal using the first input signal and the first estimated noise from the first noise estimating unit; a second noise estimating unit implemented at least by the hardware and that re-estimates a stationary noise component contained in the first input signal using at least the first input signal and the first estimated sound from the first noise reduction unit and outputs a second estimated noise; a third noise estimating unit implemented at least by the hardware and that estimates a second non-stationary noise component including a sum of a stationary noise component and a non-stationary noise component contained in the first input signal using the first input signal and a second input signal and outputs a third estimated noise; an estimated noise combining unit implemented at least by the hardware and that estimates a stationary noise component and a second non-stationary noise component contained in the first input signal using the second estimated noise from the second noise estimating unit and the third estimated noise from the third noise estimating unit; and a second noise reduction unit implemented at least by the hardware and that reduces the stationary noise component and the second non-stationary noise component contained in the first input signal.