Patent
1979-11-28
1981-09-15
Popek, Joseph A.
179 18FH, H04M 157
Patent
active
042899311
ABSTRACT:
A security identification system for telephone, teleprinter, computer, and similar communication applications comprising a plurality of transmitter station identification units, one for each transmitter station and each including an identification signal generator for generating a pulse code modulated identification signal, unique to the transmitter station, that comprises a repeating sequence of uncoded signal segments each including N pulse intervals of given duration alternating with coded signal segments each including M pulse intervals of like duration, coding being effected by the presence or absence of pulses in the coded signal segment intervals. Each pulse is transmitted as a burst of cycles of a carrier signal preferably having a carrier frequency above 3 Khz. The system further comprises a receiver identification unit at a receiver station, including a demodulator, an identification control circuit, and a visual display; the control circuit counts the pulse intervals in a demodulated uncoded segment of the identification signal to aid in identifying the beginning of each coded segment and decodes the coded segments, on a redundant basis, to actuate the display and afford a visual identification of the transmitter station.
REFERENCES:
patent: 3436487 (1969-04-01), Blane
patent: 3904830 (1975-09-01), Every, Sr. et al.
Micro-Tek, Inc.
Popek Joseph A.
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