Multi-frequency signal receiver and a method of detecting the mu

Details Multi-frequency signal receiver and a method of detecting the mu Multi-frequency signal receiver and a method of detecting the mu

1990-10-02

1993-05-25

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379283, 379351, 328138, H04M 150

Patent

active

052146936

ABSTRACT:
A multi-frequency signal receiver, and in particular a push-button signal receiver, is provided having a detector circuit and an amplitude variation supervisory circuit. The detector circuit has a group of band pass filters, each having a pass band corresponding to each elemental signal in the multi-frequency signal. The detector circuit also has a logic circuit for receiving each output from the band pass filters and outputting detected data of the multi-frequency signal. The amplitude variation supervisory circuit monitors the amplitude of an input signal for a predetermined duration and detects and holds the maximum value of the monitored amplitude. Then, the amplitude variation supervisory circuit detects when the amplitude of the input signal exceeds the maximum amplitude value to determine if the input signal is not the multi-frequency signal.

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patent: 3812432 (1974-05-01), Hanson
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patent: 4484035 (1984-11-01), Graham et al.
patent: 4599495 (1986-07-01), Richards
patent: 4626629 (1986-12-01), Premoli et al.

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