Signal detection and discrimination using waveform peak factor
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United States of America Patent
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-
Sep 22, 1987
Grant Date -
N/A
app pub date -
Dec 31, 1985
filing date -
Dec 31, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus and method for detecting and discriminating among various signals indicative of progress while making a telephone connection. A particular waveform parameter known as peak factor is advantageously employed in a call progress analyzer. The illustrative call progress analyzer uses the average magnitude peak factor (ratio of the peak of the waveform to the average of the absolute value of the waveform) to distinguish among single-tone signals (e.g., special service information tones), double-tone signals (e.g., dial tone, audible ring, and busy), and speech. Waveform ON and OFF times (duration above and below an energy threshold) are combined with signal-type determinations (made using peak factor) to automatically determine the status of a call.
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