PLATO ZORZY
Broker in Marblehead, MA
License number
Massachusetts 37534
Issued Date
Dec 1, 1963
Expiration Date
Dec 18, 1990
Type
Broker
Address
Address
Marblehead, MA 01945
Professional information
Interfacing Unit For Telephone Networks
US Patent:
4001515, Jan 4, 1977
Filed:
Nov 21, 1974
Appl. No.:
5/525755
Inventors:
Plato Zorzy - Marblehead MA
Assignee:
Astreon Corporation - Lowell MA
International Classification:
H04M 100
US Classification:
179 18HB
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.