Digital remote control system with improved noise immunity
First Claim
1. In a remote control receiver for selectively enabling a plurality of functions, each function corresponding to transmitted signals lying in a respective frequency band, the combination comprising:
- means for defining a plurality of consecutive timing intervals;
means for repetitively deriving the frequency of a transmitted signal during each of said timing intervals;
means for identifying the condition wherein a derived frequency is within a restricted range of frequencies included within one of said frequency bands and centered about the frequency derived during the immediately preceding one of said timing intervals; and
means for enabling the function corresponding to said one frequency band in response to continued satisfaction of said condition for a predetermined number of successive ones of said timing intervals.
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Accused Products
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.
22 Citations
9 Claims
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1. In a remote control receiver for selectively enabling a plurality of functions, each function corresponding to transmitted signals lying in a respective frequency band, the combination comprising:
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means for defining a plurality of consecutive timing intervals; means for repetitively deriving the frequency of a transmitted signal during each of said timing intervals; means for identifying the condition wherein a derived frequency is within a restricted range of frequencies included within one of said frequency bands and centered about the frequency derived during the immediately preceding one of said timing intervals; and means for enabling the function corresponding to said one frequency band in response to continued satisfaction of said condition for a predetermined number of successive ones of said timing intervals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a remote control receiver for selectively enabling a plurality of functions, each of said functions corresponding to transmitted signals lying in a respective frequency band, the combination comprising:
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means for deriving the frequency of a transmitted signal during each of a plurality of timing intervals; means for repetitively defining a restricted range of frequencies centered about each of said derived frequencies; and means for enabling a selected one of said functions in response to a predetermined number of successive ones of said restricted frequency ranges exhibiting a predetermined relationship. - View Dependent Claims (8, 9)
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Specification