Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1980-03-31
1982-04-27
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
375 22, 375 94, 340696, 34082563, H04L 710
Patent
active
043274412
ABSTRACT:
An improvement in a communication system is disclosed having a transmitter which transmits a pulse width modulated control signal having a synchronizing pulse, a reference pulse, and at least one control function pulse encoded therein. At least one receiver receives the transmitted control signal and detects the pulses encoded therein. In response to each detected pulse, a timing circuit in each receiver provides a timing pulse having a width related to a reference signal. A reference controller compares the width of the detected reference pulse to the width of the timing pulse and provides a reference calibration signal at a level automatically selected to reduce the compared pulse width difference. A function controller may be provided to compare the width of the detected control function pulse to the width of the timing pulse, and to perform a control function in response to a predetermined compared width difference therebetween.
REFERENCES:
patent: 3449720 (1969-06-01), Marino
patent: 3852713 (1974-12-01), Roberts
patent: 3906379 (1975-09-01), Tuhro
patent: 4005818 (1977-02-01), Krause
patent: 4065639 (1977-12-01), Suzuki
Chin Stephen
Donaldson Rich
Honeycutt Gary C.
Safourek Benedict V.
Sharp Mel
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