Tone-type recognition method
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United States of America Patent
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-
Nov 5, 1991
Grant Date -
N/A
app pub date -
Aug 23, 1989
filing date -
Aug 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed a tone type recognition method capable of recognizing a call progress state of a central office line switching system by using a tone detector. The method enables the system to correctly recognize the type of call progress tone, regardless of its frequency, by conducting periodic detection of characteristics of cadence classified by tone-type.
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