Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1983-12-22
1986-03-11
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
307540, H04L 700
Patent
active
045758638
ABSTRACT:
A programmable bias circuit for use with a data limiter circuit is described. The limiter and bias circuit are coupled to a portable data receiver which is adapted to communicate in a coded system. Frequency disparities between a transmitted word sync signal and the portable data terminal local oscillator signal will cause a DC offset voltage in the received data signal. The programmable bias circuit is controlled by a decoder within the portable data terminal. If the terminal is in an idle state, the programmable bias circuit will be set to rapidly follow offset voltage shifts until a transmitted word sync signal has been detected. After word sync has been detected, a slower, more stable time constant circuit is programmably activated for the duration of the digital data message. The fast time constant circuit is activated at the end of the received data signal.
REFERENCES:
patent: 3585298 (1971-07-01), Liberman
patent: 3681698 (1972-08-01), McEvoy
patent: 3706091 (1972-12-01), May, Jr.
patent: 4021739 (1977-05-01), Baum et al.
patent: 4029904 (1977-06-01), Papeschi
patent: 4038605 (1977-07-01), Elder et al.
patent: 4215239 (1980-07-01), Gordy et al.
patent: 4320517 (1982-03-01), Godard et al.
patent: 4352193 (1982-09-01), Acker
patent: 4387465 (1983-06-01), Becker
patent: 4433425 (1984-02-01), de Jaeger
Butcher James S.
Rousch Charles G.
Chin Stephen
Griffin Robert L.
Jacobson, Jr. James E.
Motorola Inc.
Roney Edward M.
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