Detector alternative low frequency signals, in particular for telephone connector.

摘要

SIGNAL DETECTOR ALTERNATIVE LOW FREQUENCY, ESPECIALLY FOR RECOGNITION OF SIGNALS HUE JUNCTION IN A RED LINE ANALOGUE a telephone system private type. DETECTOR consists of an amplifier (1) LINKED THE ONE HAND, AT THE ENTRANCE OF A bandpass filter (2) and secondly at the entrance of a first cell redirector-FILTERED (3), a second cell redirector -Filtering (4) and a presence detector THRESHOLD (5) connected OUTPUT bandpass filter (2). OUTPUT DETECTOR (5) ALLOWS OR NO COMPARISON BY UNCOMPARADOR (6) between the input and filter output AND SIGNALING THE PRESENCE OF EXPECTED AC signal.