Digital remote control system with improved noise immunity

H - Electricity – 04 – B

Patent

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349/2

H04B 11/00 (2006.01) G08C 19/12 (2006.01) H03J 9/04 (2006.01)

Patent

CA 1120576

ABSTRACT OF THE DISCLOSURE A remote control receiver for selectively actuating a plurality of functions, each function uniquely frequencies 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.

313102

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