Detection of tonal signals

Details Detection of tonal signals Detection of tonal signals

1998-01-20

1999-10-19

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704213, 704275, G10L 912

Patent

active

059704470

ABSTRACT:
The system and method of the present invention uses a zero-crossing rate measurement in order to determine the initiation and/or termination of speech in an audio signal input. It is especially well suited for detecting the termination of a telephone message in a telephone answering device. Specifically, a sample of the zero-crossing rate signal is determined by counting the number of consecutive speech samples required for the occurrence of a pre-defined number of consecutive zero-crossings. The resultant zero-crossing rate signal is smoothed and applied to a differentiator. A short-time magnitude integration is performed to measure the energy in the differentiated signal. The output of the magnitude integration is provided to a threshold detector which produces a sequence of decision values indicating the presence or absence of speech. Finally, the decision values are filtered to produce a more definitive sequence of final decision values.

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