Classification of audio as speech or non-speech using multiple threshold values
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United States of America Patent
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Jul 24, 2007
Grant Date -
Jun 22, 2006
app pub date -
Feb 28, 2006
filing date -
Apr 19, 2000
priority date (Note) -
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Abstract
A portion of an audio signal is separated into multiple frames from which one or more different features are extracted. These different features are used, in combination with a set of rules, to classify the portion of the audio signal into one of multiple different classifications (for example, speech, non-speech, music, environment sound, silence, etc.). In one embodiment, these different features include one or more of line spectrum pairs (LSPs), a noise frame ratio, periodicity of particular bands, spectrum flux features, and energy distribution in one or more of the bands. The line spectrum pairs are also optionally used to segment the audio signal, identifying audio classification changes as well as speaker changes when the audio signal is speech.
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