Telephone line circuit having time-shared DTMF receivers

Details Telephone line circuit having time-shared DTMF receivers Telephone line circuit having time-shared DTMF receivers

1984-09-27

1986-12-02

Dwyer, James L.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379284, 379290, 379386, H04M 300

Patent

active

046266283

ABSTRACT:
The invention provides a circuit and method for the time-sharing of a DTMF tone receiver. A DTMF receiver has its input terminal connected to a common output terminal of a pair of transmission gates, each gate having an input terminal connected to a respective source of DTMF signals. A control circuit provides switching signals to the transmission gates to cause their input terminals to be connected alternately to the input terminal of the receiver at a predetermined rate until the receiver detects a tone signal on at least one of the input terminals of the gates. The control circuit includes circuitry responsive to the initial tone detection for inhibiting the further generation of switching signals until the tone detection by the receiver has been completed.

REFERENCES:
patent: 3936611 (1976-02-01), Poole
patent: 4048450 (1977-09-01), Bernard et al.

Affiliated with

Also associated with

Rating

Telephone line circuit having time-shared DTMF receivers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone line circuit having time-shared DTMF receivers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone line circuit having time-shared DTMF receivers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2293621