Method for continuous recognition of alphanumeric strings spoken over a telephone network

US5303299A · kind A · utility

Assignee

• VCS Industries, Inc. · US

Inventors

• Alan K. Hunt · Carrollton, US
• Thomas Barton Schalk · Plano, US

Key dates

• Filing date: Jun 22, 1992
• Grant date: Apr 12, 1994
• Expiry date: Jun 22, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M2201/40
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The present invention describes a method for recognizing alphanumeric strings spoken over a telephone network wherein individual character recognition need not be uniformly high in order to achieve high string recognition accuracy. Preferably, the method uses a processing system having a digital processor, an interface to the telephone network, and a database for storing a predetermined set of reference alphanumeric strings. In operation, the system prompts the caller to speak the characters of a string, and characters are recognized using a speaker-independent voice recognition algorithm. The method calculates recognition distances between each spoken input character and the corresponding letter or digit in the same position within each reference alphanumeric string. After each character is spoken, captured and analyzed, each reference string distance is incremented and the process is continued, accumulating distances for each reference string, until the last character is spoken. The reference string with the lowest cumulative distance is then declared to be the recognized string.