Signal analyzing system
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United States of America Patent
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-
Dec 3, 1991
Grant Date -
N/A
app pub date -
Aug 8, 1990
filing date -
Aug 8, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An analog communication signal such as the signal transmitted over a telephone line is converted to digital form for storage in the memory of a computer. Segments of the digital representation of the signal are analyzed to determine whether or not the signal has uniform frequency components repeating at regular intervals. Detection of such regularly repeating uniform frequency components is useful in an automated telephone system to determine whether a telephone signal consists of voice or a call progress signal.
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