Communications: electrical – Digital comparator systems
Patent
1976-04-30
1977-10-04
Yusko, Donald J.
Communications: electrical
Digital comparator systems
325392, H04Q 912
Patent
active
040527018
ABSTRACT:
Ultrasonic remote control receiver wherein reference frequency pulses are counted during a counting cycle comprising a predetermined number of received command signals, each command signal occupying a different frequency channel. At the end of each counting cycle, the reference frequency count is compared with the count during the preceding counting cycle. A validated output from the receiver occurs only after a predetermined number of uninterrupted identical comparisons have occurred. Interference with a validated output signal by spurious received signals e.g. noise signals is minimized by providing for invalidation of an output signal only after a predetermined number of uninterrupted non-identical count comparisons. Two of the receiver outputs are used to generate a variable duty cycle pulse train, one output increasing and the other decreasing the duty cycle. A receiver is disclosed in the context of a TV broadcast receiver wherein the variable level d.c. control signal is used to control an electronic sound attenuator. The remote control receiver also includes power-on-reset and mute functions. Each of the remote control receiver outputs has a parallel connected manual switch, to some of which anti-bounce circuits are connected.
REFERENCES:
patent: 3914698 (1975-10-01), Leuschner
patent: 3973242 (1975-08-01), Field et al.
patent: 3974451 (1976-08-01), Maeder
patent: 3980956 (1976-09-01), Woolling, Jr.
patent: 3987414 (1976-10-01), Tuma
Comfort James T.
Donaldson Richard L.
Levine Harold
Texas Instruments Incorporated
Yusko Donald J.
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