Switch hook flash detection circuit

Details Switch hook flash detection circuit Switch hook flash detection circuit

H - Electricity

04

Q

340/74

H04Q 1/36 (2006.01)

Patent

CA 1336446

A digital signal calibration circuit for receiving an input digital signal, filtering transient signal pulses, lengthening pulses of a first predetermined duration to a second predetermined duration, and generating a calibrated digital output signal in response thereto. The output signal is then digitally sampled to detect predetermined digital signal bit patterns. The signal calibration circuit can be used in a communication system for detecting digital hookswitch flash and dial pulsing signals.

603683

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