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Method for generating a clock signal for use in a data receiver, clock generator, data receiver and remote controlled access system for vehicles

  • US 5,928,293 A
  • Filed: 04/29/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 04/30/1996
  • Status: Expired due to Fees
First Claim
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1. A method for generating a clock signal for use in a data receiver, the clock signal being substantially synchronised with data received by the data receiver, the received data comprising a sync word having a predetermined data frequency and predetermined value and being Manchester coded so that each bit of the sync word comprises a logic `1` in one phase of a clock period and a logic `0` in an anti-phase of the clock period, the method comprising the steps of:

  • generating n clocks, each of the n clocks having a frequency which is substantially the predetermined data frequency and being out of phase with an adjacent clock of the n clocks by 1/n of the clock period, each of the n clocks further having one other clock of the n clocks in anti-phase therewith, wherein the data receiver comprises register means comprising n registers, each of the n registers being clocked by a respective one of the n clocks, and having an anti-phase register clocked by an anti-phase clock;

    shifting the received data into each register of the n registers in parallel according to the respective clock of the n clocks;

    comparing the contents of each register with a Manchester coded comparison word having the predetermined value and providing a comparison signal for each of the n registers, the comparison signal having a first logic state when the contents of the register match the comparison word and a second logic state when the contents of the register do not match the comparison word;

    checking whether the contents of each register is inverted compared to the contents of its anti-phase register;

    providing an output signal for each register, the output signal having a first logic state when the comparison signal for the register has a first logic state and the contents of the register is inverted compared to the contents of its anti-phase register, and a second logic state when the comparison signal of the register has a second logic state and/or the contents of the register is not inverted compared to the contents of its anti-phase register;

    selecting one of the n clocks which clocks a register whose output signal has the first logic state; and

    providing the selected one of the n clocks at an output, the selected one of the n clocks providing the clock signal.

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