Patent Review

SINGLE CHANNEL SOUND SEPARATION
Patent No.: US 7,243,060 B2 
Inventors: Les Atlas, Seattle, WA (US); Jeffrey Thompson, Bothell, WA (US)
Publication Date: Jul. 10, 2007
Filing Date : Apr. 2, 2003

The speech of two or more simultaneous speakers (or other simultaneous sounds) conveyed in a single channel are distinguished. Joint acoustic/modulation frequency analysis and display tools are used to localize and separate sonorant(a sound produced with the vocal cords) portions of multiple-speakers’ speech into distinct regions using invertible transform functions. For example, the regions representing one of the speakers are set to zero, and the inverted modified display maintains only the speech of the other speaker. A combined audio signal is manipulated using a base acoustic transform, followed by a second modulation transform, which separates the combined signals into distinguishable components. The components corresponding to the undesired speaker are masked, leaving only the second modulation transform of the desired speaker’s audio signal. An inverse second modulation transform of the desired signal is performed, followed by an inverse base acoustic transform of the desired signal, providing an audio signal for only the desired speaker. 

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