Multifrequency detection
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United States of America Patent
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-
Dec 17, 1991
Grant Date -
N/A
app pub date -
Feb 1, 1988
filing date -
Feb 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The detection of DTMF tones is improved in a three-step process: first testing even-numbered samples; then testing odd-numbered samples, and finally testing for tone quality (time interval and frequency stability).
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