Dialer circuit

Details Dialer circuit Dialer circuit

1989-11-02

1991-08-20

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379360, 379361, 379362, 379387, H04M 100

Patent

active

050420666

ABSTRACT:
A dialer circuit equipped with built-in dialer memories for auto-redial or abbreviated-dial telephone communication and operable to send out a DTMF signal or a pulse signal to a telephone circuit based on a key input signal. A battery voltage is supplied to the dialer memories from a back-up battery, while a supply voltage is supplied to the other function circuits from a telephone circuit line. A voltage level converter means is located between the dialer memories and the other function circuits and eliminates production of through current resulting from the difference between the back-up battery voltage and the line voltage.

REFERENCES:
patent: 4419542 (1983-12-01), Embree et al.
patent: 4475013 (1984-10-01), Lee et al.
patent: 4476350 (1984-10-01), Aull et al.
patent: 4560841 (1985-12-01), Pierrel
patent: 4581487 (1986-04-01), Cochran
patent: 4612417 (1986-09-01), Toumani
patent: 4653088 (1987-03-01), Budd et al.
patent: 4665547 (1987-05-01), Tuhy, Jr.
patent: 4727574 (1988-02-01), Jakab
patent: 4811391 (1989-03-01), Van Dongen et al.
patent: 4961220 (1990-10-01), Tentler et al.

Affiliated with

Also associated with

Rating

Dialer circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dialer circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dialer circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1013827