Methods and apparatus for detecting voice information in telephone-type signals
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United States of America Patent
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-
Aug 24, 1993
Grant Date -
N/A
app pub date -
Dec 11, 1990
filing date -
Dec 11, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Voice signal information in a telephone-type signal is detected by subjecting the signal to several tests such as a minimum energy test, an amplitude ratio test, and a sequencing test which ensures that the other tests have been satisfied for a sufficient length of time and/or sufficiently frequently over a predetermined time interval. A voice processing system such as a voice mail system may use the detection of voice as above to initiate the transmission of an announcement or message during an automatically placed telephone call.
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