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Method and apparatus for determining digits dialed using a selected algorithm

  • US 5,881,146 A
  • Filed: 06/04/1997
  • Issued: 03/09/1999
  • Est. Priority Date: 02/05/1996
  • Status: Expired due to Term
First Claim
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1. A method of determining which one of a plurality of possible digits has been dialed by a remote caller, the dialing of said one digit producing a signal comprising a sequence of pulses, the method comprising the steps of:

  • determining whether or not the maximum variation between any two periods of said sequence exceeds a predetermined threshold;

    if said variation does not exceed said threshold, utilizing a first algorithm to determine the digit dialed by dividing the length of said sequence by the length of the period of said sequence; and

    if said variation exceeds said threshold, prompting said remote caller and utilizing a second algorithm to determine future dialed digits.

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