Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1985-04-15
1987-01-20
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
375 58, 455212, 455222, H04B 110
Patent
active
046384960
ABSTRACT:
A communication system for providing reliable transfer of digital data in such system as a security system between source of data 214 and user 213, and between user 213 and end use of data 215. When the false alarm rate requirement of the security system is specified in less than one in ten years, this tight requirement must also apply to the communication link even though the RF transmission path might use the very noisy 60 Hz power line. Digital data signals are transmitted only when a detection is made at source of data 214 or when user 213 outputs an action command to end of use data 215. Thus the communication system must maintain the low false alarm rate under two conditions: (1) where no data signal but noise and interference is received over long periods of time, and (2) where a data signal pulse noise is received. Receiver 212s' ability to differentiate between valid data and noise is increased by incorporating the digital data into a composite signal having a number of different signal and timing elements before it is sent. The discriminating ability of receivers 212 is further increased by including cascaded multi-stage signal processing circuits which respond to each of the elements of the composite signal but not to noise. A further barrier to false responses is provided by digital data decoders 219 which include additional signal processing circuits to recognize and accept only the valid data when it is part of a composite signal having elements of a correct count, timing and order.
REFERENCES:
patent: 3423682 (1969-01-01), Cauchois
patent: 3564419 (1971-02-01), Yackish
patent: 3651263 (1972-03-01), Lindback et al.
patent: 3764984 (1973-10-01), McCartney
patent: 3961137 (1976-06-01), Hutt et al.
patent: 3978479 (1976-08-01), Schmitz
patent: 4006460 (1977-02-01), Hewitt et al.
patent: 4023139 (1977-05-01), Samburg
patent: 4138674 (1979-02-01), Humphries
patent: 4168494 (1979-09-01), Hummel et al.
patent: 4203096 (1980-05-01), Farley et al.
patent: 4204201 (1980-05-01), Williams et al.
patent: 4254410 (1981-03-01), Virkus
patent: 4257038 (1981-03-01), Rounds et al.
patent: 4306308 (1981-12-01), Nossen
patent: 4483011 (1984-11-01), Brown
patent: 4536747 (1985-08-01), Jensen
BSR Model X-10 Home Control System (by Garold K. Jensen).
LSI Circuit MM54240 (by Garold K. Jensen).
Communication Systems by Carlson, McGraw-Hill, 1975, pp. 5-7.
Glenny Raymond C.
Griffin Robert L.
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