Digital multifrequency signal receiver

Details Digital multifrequency signal receiver Digital multifrequency signal receiver

1984-12-14

1986-12-02

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal receiver

328138, 34082573, 3701103, H04M 150

Patent

active

046266291

ABSTRACT:
A digital multifrequency receiver circuit of the type employed between telephone system central offices, arranged to provide a faster response to received signals by processing the received signal tones digitally. The faster response resulting from the elimination of automatic gain control circuits and the use of a fixed gain amplifier used only when the received signal is below an acceptable level and the provision of a variable threshold to the individual frequency comparator circuits.

REFERENCES:
patent: 4395595 (1983-07-01), Nishitani et al.
patent: 4484035 (1984-11-01), Graham et al.

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