Patent ID: 9369803
Filing Date: 2016-06-14
CPC Classification: G10L,H04R,H04S

Claim Text:
1. A method of removing noise from a two-channel sound signal, the method comprising: receiving, by a processor, channel sound signals constituting the two-channel sound signal; obtaining, by the processor, a noise signal for each channel by removing a target sound signal from each channel sound signal by subtracting other channel sound signal multiplied by a weighted value from each channel sound signal; estimating, by the processor, a power spectral density PSD of a diffuse noise from each channel sound signal; obtaining, by the processor, a first sound signal comprising a target signal and an interference signal for each channel by removing the diffuse noise from each channel sound signal using the estimated PSD of the diffuse noise; obtaining, by the processor, a first diffuse noise removing gain based on a PSD of each channel sound signal and the estimated PSD of the diffuse noise; obtaining, by the processor, a second diffuse noise removing gain based on a PSD of the noise signal for each channel, the estimated PSD of the diffuse noise, and directional information of the target signal for each channel; obtaining, by the processor, the PSD of each channel sound signal through a first-order recursive averaging of each channel sound signal; and obtaining, by the processor, the PSD of the noise signal for each channel through a first-order recursive averaging of the noise signal for each channel; obtaining, by the processor, the interference signal for each channel by removing the diffuse noise from the noise signal for each channel using the estimated PSD of the diffuse noise; removing, by the processor, the interference signal from the first sound signal, wherein the obtaining of the first sound signal comprises removing the diffuse noise from each channel sound signal by multiplying the channel sound signals by the first diffuse noise removing gain to remove the diffuse noise while maintaining directionality of the channel sound signals, and wherein the obtaining of the interference signal for each channel comprises removing the diffuse noise from each channel sound signal by multiplying the noise signal for each channel by the second diffuse noise removing gain to remove the diffuse noise while maintaining directionality of the noise signal for each channel.