Communications: electrical – Digital comparator systems
Patent
1977-10-25
1979-12-04
Pitts, Harold I.
Communications: electrical
Digital comparator systems
340171R, 340171PF, 340164R, 340168B, H04Q 400
Patent
active
041774531
ABSTRACT:
A remote control receiver for selectively actuating a plurality of functions, each function uniquely corresponding to control signals lying in a respective band of frequencies. The function determining control signal is supplied to a digital counter which, during each of a continuous series of fixed duration timing intervals, develops an output count representative of the frequency of the received control signal. A portion of each count comprising the most significant bits thereof is processed for identifying the condition wherein the frequency of the received control signal lies in the same frequency band for successive timing intervals. The remaining portion of each count comprising the least significant bits thereof is processed for identifying the condition wherein a subsequent count is within a restricted range of counts centered about a prior count for successive timing intervals. Coincidence of the two conditions for a predetermined number of consecutive timing intervals results in actuation of the function corresponding to the frequency band for which the conditions were satisfied.
REFERENCES:
patent: 3611927 (1971-10-01), Kramer
patent: 3855575 (1974-12-01), Leuschner
patent: 3980956 (1976-09-01), Wooling
patent: 4006462 (1977-01-01), Podowski
patent: 4010423 (1977-03-01), Collins
patent: 4021741 (1977-05-01), Collins
patent: 4023105 (1977-05-01), Wooling
patent: 4064488 (1977-12-01), Chapman
Pitts Harold I.
Zenith Radio Corporation
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