Remote control systems
AssigneePico Electronics Limited
InventorNeil D. Duffy
Life of this patent
Estimating the term…
Abstract
An acoustic remote control link transmits different value bits as pulses containing different numbers of carrier cycles and identifies those bits on reception on the basis of the received pulses containing numbers of carrier cycles in one or other of two ranges. Each word transmitted is accompanied by a word of inverse digital value, the two words being compared on reception. A received pulse is deemed to have finished when a gap of given duration exists in the carrier.
Claims15
A remote control system having:
- a transmitter comprising:
- (a) an output transducer,
- (b) modulating means coupled to feed the transducer and having input means for receiving a carrier signal of predetermined frequency and for receiving a modulating signal,
- (c) modulating signal producing means having a data input for receiving a data signal representing instructions for remote control and a data output connected to said input means for controlling said modulating means to produce, for each instruction, a pulse code modulated signal representing the instruction as a multi-bit digitally encoded word,
- (d) wherein said modulated signal comprises pulses of carrier cycles for representing two differently valued bits of said word by one and the other of two predetermined numbers of cycles of the carrier signal;
- and
- a receiver comprising:
- (a) an input transducer,
- (b) counting means for counting the number of cycles of carrier signal in each received pulse as transmitted by said transmitter and received by the input transducer, and
- (c) determining means receiving from said counting means the count of said number of cycles of carrier signal in each received pulse, for determining whether said number of cycles is within a first range of numbers or within a second range of numbers, said first and second ranges of numbers being non-overlapping and including no numbers in common, and
- (d) means for converting a received pulse into a signal representing one or another of said differently valued bits whenever said determining means determines that the count of the number of cycles in the received pulse is included in said first or in said second range of numbers, respectively.
A receiver circuit for receiving a multi-bit digitally coded instruction in the form of a sequence of pulses, each pulse comprising a plurality of cycles of a carrier, the receiver circuit comprising:
- (a) counting means for counting the number of cycles of carrier signal in each pulse, and
- (b) determining means receiving from said counting means the count of said number of cycles of carrier signal in each pulse for determining whether said number of cycles is within a first range of numbers or within a second range of numbers, said first and second ranges of numbers being non-overlapping and including no numbers in common, and
- (c) means for producing for each such pulse a signal of one or another of two values responsive to a determination by said determining means that the count of the number of cycles in the pulse is included in said first or said second ranges of numbers, respectively.
Dependencies are inferred from the claim text.