Patent ID: 7249015
Filing Date: 2007-07-24
Classification: G10L

Abstract:
1. One or more computer-readable media having stored thereon instructions that, when executed by a processor, cause the processor to perform acts comprising: separating at least a portion of an audio signal into a plurality of frames; extracting line spectrum pairs from each of the plurality of frames; and using at least the line spectrum pairs to classify at least the portion as either speech or non-speech, wherein the using comprises: extracting a high zero crossing rate ratio feature from the plurality of frames; extracting a low short time energy ratio feature from the plurality of frames; extracting a spectrum flux feature from the plurality of frames; pre-classifying the portion as speech or non-speech based at least in part on an average zero crossing rate, the high zero crossing rate ratio, the low short time energy ratio, and the spectrum flux features; using a first value as the threshold value if the portion is pre-classified as speech, whereby the first value is outputted; and using a second value as the threshold value if the portion is pre-classified as non-speech, wherein the second value is less than the first value, whereby the second value is outputted.