초록 ▼

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

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.

대표청구항 ▼

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 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.