Patent ID: 7092881
Filing Date: 2006-08-15
Classification: G10L

Abstract:
1. A system for processing an audio signal comprising: means for dividing the audio signal into segments, each segment representing a portion of the audio signal occurring in one of a succession of time intervals; means for detecting for each segment the presence of a fundamental frequency; means responsive to the detecting means for determining the voicing probability for each segment by computing a ratio between voiced and unvoiced components of the audio signal, the determining means comprising: means for separating the signal in each segment into a voiced portion and an unvoiced portion on the basis of the voicing probability, wherein the voiced portion of the signal occupies the low end of the spectrum and the unvoiced portion of the signal occupies the high end of the spectrum for each segment; and means for separately encoding the voiced portion and the unvoiced portion of the audio signal.