Apparatus and method for isolating multi-channel sound source

摘要

In an apparatus and method for isolating a multi-channel sound source, the probability of speaker presence calculated when noise of a sound source signal separated by GSS is estimated is used to calculate a gain. Thus, it is not necessary to additionally calculate the probability of speaker presence when calculating the gain, the speaker's voice signal can be easily and quickly separated from peripheral noise and reverb and distortion are minimized. As such, if several interference sound sources, each of which has directivity, and speakers are simultaneously present in a room with high reverb, a plurality of sound sources generated from several microphones can be separated from one another with low sound quality distortion, and the reverb can also be removed.

主权项

1. An apparatus for isolating a multi-channel sound source comprising:
a microphone array comprising a plurality of microphones; a signal processor to perform Discrete Fourier Transform (DFT) upon signals received from the microphone array, convert the DFT result into a signal of a time-frequency bin, and independently separate the converted result into a signal corresponding to the number of sound sources using a Geometric Source Separation (GSS) algorithm; and a post-processor to estimate noise from a signal separated by the signal processor, calculate a gain value on the basis of the estimated noise and speech presence probability calculated when the noise is estimated at each time-frequency bin, and apply the calculated gain value to a signal separated by the signal processor, thereby separating a speech signal.