×

Method for recognizing alphanumeric strings spoken over a telephone network

  • US 5,125,022 A
  • Filed: 08/10/1990
  • Issued: 06/23/1992
  • Est. Priority Date: 05/15/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A method, using a processing system, for recognizing character strings spoken by a caller over a telephone network, the processing system including a digital processor, means for interfacing to the telephone network and storage means for storing a predetermined set of reference character strings each having at least two characters, comprising the steps of:

  • (a) initializing a cumulative recognition distance for each of the reference character strings to zero;

    (b) prompting the caller to speak a character in a character string to be recognized;

    (c) capturing and analyzing the spoken character;

    (d) calculating a measure of acoustical dissimilarity between the spoken character and a corresponding character of each of the reference character strings to generate a recognition distance for each of the reference character strings;

    (e) incrementing the cumulative recognition distance for each of the reference character strings by the recognition distance generated in step (d);

    (f) repeating steps (b)-(e) for each successive character in the character string to be recognized and a corresponding character of each of the reference character strings;

    (g) determining which of the reference character strings has a lowest cumulative recognition distance; and

    (h) declaring the reference character string with the lowest cumulative recognition distance to be the character string spoken by the caller.

View all claims
  • 11 Assignments
Timeline View
Assignment View
    ×
    ×