Infra-red remote controlled command system for a communications

Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means

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358194, H04B 900

Patent

active

040912728

ABSTRACT:
An arrangement for effectively excluding the effects of disturbance pulses in the operation of an infra-red remote control system (e.g., for channel switching of a television receiver) is described. Facilities are provided on the transmitting side of the remote control arrangement for encoding the pulse interval of a chain of pulses derived from a quartz crystal-controlled oscillator with the intelligence contained in a selected one of a plurality of command signals for the channel switching function. The resulting encoded pulses are converted into a form suitable for modulating a high-frequency chain of pulses from the same oscillator so that the infra-red transmitter emits intelligence in extremely short-duration bursts of energy. The occurrence of the first pulse of the received train of modulated intelligence at the remote-control receiver triggers the generation of a sequence of pulses corresponding to the interval-encoded pulses derived from the oscillator in the transmitter, such latter pulses being generated by a second quartz crystal-controlled oscillator. An additional chain of window-forming pulses are derived from the second oscillator. Such latter pulses appear ideally at the times of occurrence of the pulses in the transmitted encoded sequence from the infra-red sending element; and upon verification that the window-forming pulses and the received pulse sequence coincide, the received pulse sequence is employed to encode the interpulse interval of the pulse sequence derived from the second oscillator. Such PCM-encoded pulse sequence contains the intelligence encoded on the corresponding pulse sequence in the transmitter, and may then be decoded at the receiver to provide a channel switching function in accordance with the original selected command signal.

REFERENCES:
patent: 3924120 (1975-12-01), Cox, III
patent: 3928760 (1975-12-01), Isoda

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