Patent ID: 8638952
Filing Date: 2014-01-28
Classification: G10L,H04R

Abstract:
1. A signal processing apparatus comprising: a first calculator to obtain phase difference between two spectrum signals in a frequency domain transformed from sound signals received by at least two microphones for each frequency in a certain frequency band, each of the two spectrum signals including frequency components; a second calculator to obtain, for each frequency component of one spectrum signal of the two spectrum signals, a value representing a target signal likelihood dependent on a value of the frequency component, and to determine whether the frequency component includes noise on the basis of the value representing the target signal likelihood obtained for the frequency component; and a filter to, when the second calculator determines that a respective frequency component includes noise, generate a synchronized spectrum signal by synchronizing the respective frequency component of one of the two spectrum signals to the respective frequency component of the other of the two spectrum signals by phase shifting on the basis of the phase difference obtained by the first calculator, and to generate a filtered spectrum signal by subtracting the synchronized spectrum signal from the other of the two spectrum signals or adding the synchronized spectrum signal to the other of the two spectrum signals.