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Synchronous timer vehicle speed measurement

  • US 6,219,624 B1
  • Filed: 08/03/1998
  • Issued: 04/17/2001
  • Est. Priority Date: 08/03/1998
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the period of a signal comprising a sequence of the following steps:

  • detecting a first edge of said signal;

    accumulating predetermined time interval increments between edges of the signal;

    if the current value of the accumulated increments is equal to or greater than a predetermined maximum value, terminating the period measurement and storing said maximum value as the period measurement value;

    if said current value is less than said predetermined maximum value, calculating a remainder time interval upon detection of a second edge of said signal and modifying said current value to account for the calculated remainder and storing modified current value as the period measurement value; and

    calculating an average period from a plurality of consecutive period measurement values.

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