| 摘要 |
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.
|
