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Rotary dial pulse receiver

  • US 4,944,001 A
  • Filed: 06/06/1988
  • Issued: 07/24/1990
  • Est. Priority Date: 06/19/1987
  • Status: Expired due to Fees
First Claim
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1. A rotary dial pulse receiver for detecting and decoding bursts of line current activity produced by rotary dial action of any one of a plurality of telephone handsets wherein each of said handsets does not necessarily produce the same number of bursts of line current activity for a given digit dialed, comprising:

  • detection means for detecting each burst of line current activity produced in dialing a sequence of digits from a handset, said sequence including a predetermined test digit at a predetermined location in the sequence of digits dialed;

    counting means connected to the detection means for providing an output count of the number of detected bursts of line current activity associated with each digit dialed; and

    conversion means connected to the counting means and responsive to the detection of said predetermined test digit and to any one of a plurality of possible output counts producible by dialing said predetermined test digit from one of said plurality of handsets for selecting from among a plurality of conversion algorithms a conversion algorithm effective to convert the output count produced in dialing the predetermined test digit by said one handset to the numerical value of said predetermined digit and responsive to the detection of each other digit in said sequence of digits dialed from said one handset for applying said conversion algorithm to convert the output count associated with each other digit dialed by said one handset to its respective numerical value.

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