Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1988-12-19
1990-06-19
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379201, 379386, H04M 342
Patent
active
049359584
ABSTRACT:
Apparatus for recognizing a telephone call supervision signal by comparing its frequency and cadence to the frequency and cadence of a previously learned call supervision signal is provided as part of call completion equipment (10). Call progress tone detector (50) receives a call supervision signal and responds by outputting frequency parametric signals which indicate whether predetermined standard frequencies are present in the received signal. Microprocessor (74) determines the cadence of the received call supervision signal and outputs a corresonding cadence parametric signal. If it is beneficial to learn the received call supervision signal, the frequency and cadence parameters are stored in memory (78). Recognition circuits can then recognize a subsequent telephone call supervision signal by comparing its frequency and cadence parameters to the frequency and cadence parameters stored in memory (78) for at least one learned signal.
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Klecka Mark D.
Krakau Herbert B.
Mehta Bakulesh A.
Milsted Neil F. N.
Morganstein Sanford J.
Dwyer James L.
Dytel Corporation
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