Interfacing unit for telephone networks

Details Interfacing unit for telephone networks Interfacing unit for telephone networks

1974-11-21

1977-01-04

Claffy, Kathleen H.

179 43, 179 84R, H04M 100

Patent

active

040015157

ABSTRACT:
A telephone interfacing circuit. A digital bandpass filter transmits a continuous pulse stream in response to a ringing signal which has a frequency in the normal range of voice signals. A high frequency reference pulse source clocks a first counter to determine a final interval. Then a second counter establishes a second interval corresponding to the bandwidth. During this interval, a gate can pass incoming signals in the pass band. Another circuit discriminates a continuous pulse stream to actuate a ringing signal oscillator for transmitting a ringing signal at another frequency.

REFERENCES:
patent: 2395916 (1946-03-01), Stanley
patent: 2874226 (1959-02-01), Pharis
patent: 3264412 (1966-08-01), Van Eynde
patent: 3428755 (1969-02-01), Draper
patent: 3501591 (1970-03-01), Krasin
patent: 3591728 (1971-07-01), Birck

Affiliated with

Also associated with

Rating

Interfacing unit for telephone networks does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-255841