Infra-red remote controlled command system for a communications receiver
First Claim
1. In a remote command system for regulating a prescribed function of at least one communication receiver in accordance with one of a plurality of selected manual commands, command sending means including an infra-red transmitting element, resettable command reproduction means disposed at the receiver and including an infra-red detecting element, first frequency controlled oscillator means associated with the command sending means for generating a first pulse sequence at a first rate, first dividing means coupled to the first oscillator means for generating a second pulse sequence at a second rate corresponding to a sub-multiple of the first rate, first resettable means responsive to the selected manual command signal for encoding the pulse interval of the second pulse sequence to form a third pulse sequence, first means responsive to the output of the first encoding means for modulating the first pulse sequence to form a fourth pulse sequence, means for applying the fourth pulse sequence to the transmitting element for radiation to the detecting element of the command reproducing means, second frequency controlled oscillator means associated with the reproducing means for generating a fifth pulse sequence identical to the first pulse sequence at the first rate, second dividing means coupled to the second oscillator means and normally responsive to the detected fourth pulse sequence for generating a sixth pulse sequence identical to the second pulse sequence at the second rate upon the detection of the first pulse of the fourth pulse sequence, and means including checking means responsive to the detected fourth pulse sequence for encoding the repetition interval of the sixth pulse sequence to yield a seventh pulse sequence decodable to reproduce the selected command.
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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.
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Citations
14 Claims
- 1. In a remote command system for regulating a prescribed function of at least one communication receiver in accordance with one of a plurality of selected manual commands, command sending means including an infra-red transmitting element, resettable command reproduction means disposed at the receiver and including an infra-red detecting element, first frequency controlled oscillator means associated with the command sending means for generating a first pulse sequence at a first rate, first dividing means coupled to the first oscillator means for generating a second pulse sequence at a second rate corresponding to a sub-multiple of the first rate, first resettable means responsive to the selected manual command signal for encoding the pulse interval of the second pulse sequence to form a third pulse sequence, first means responsive to the output of the first encoding means for modulating the first pulse sequence to form a fourth pulse sequence, means for applying the fourth pulse sequence to the transmitting element for radiation to the detecting element of the command reproducing means, second frequency controlled oscillator means associated with the reproducing means for generating a fifth pulse sequence identical to the first pulse sequence at the first rate, second dividing means coupled to the second oscillator means and normally responsive to the detected fourth pulse sequence for generating a sixth pulse sequence identical to the second pulse sequence at the second rate upon the detection of the first pulse of the fourth pulse sequence, and means including checking means responsive to the detected fourth pulse sequence for encoding the repetition interval of the sixth pulse sequence to yield a seventh pulse sequence decodable to reproduce the selected command.
Specification