Classification of audio signals on a telephone line
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United States of America Patent
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-
Apr 9, 1991
Grant Date -
N/A
app pub date -
Jun 28, 1989
filing date -
Jun 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This telephone solicitation system provides automatic dialing and call-progress detection. Audio signals on the line are analyzed to recognize network operation tones, noise bursts, and speech. A 'sample' is the total number of crossings during a 25 millisecond period. A 'window' is a sequence of eight samples analyzed for spectral and time patterns.
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