Patent ID: 9271075
Filing Date: 2016-02-23
CPC Classification: G10L,H04B,H04R

Claim Text:
1. A signal processing apparatus comprising: an adder that acquires a plurality of input signals from a plurality of microphones and calculates an added value obtained by adding the input signals together; a subtracter that acquires a plurality of input signals from the plurality of microphones and calculates a subtracted value obtained by subtracting one input signal from the other input signal; a ratio calculator that calculates a ratio of the subtracted value to the added value; a gain calculator that calculates a gain based on a value of the ratio and information indicating a relationship between the gain and the value of the ratio which varies according to a distance between the microphones; a determination unit that determines noise being included in the input signals when a difference between the added value and the subtracted value is less than a threshold value; and a noise suppression unit that suppresses noise of the input signals based on the gain calculated by the gain calculator.