Title:
【発明の名称】録音された音声を検出するシステムおよび方法
Document Type and Number:
Japanese Patent JP2002514318
Kind Code:
A
Abstract:
The present invention is a reliable system and method for detecting a recorded voice, which can be employed independently or to provide protection from fraudulent use of a recording to defeat an automatic speaker recognition system. Several techniques and systems are employed either independently or in combination to verify that a detected audio sample is live and not recorded. Temporal speech characteristics of an audio sample are analyzed to determine whether a sample under examination is so similar to a previous sample as to indicate a recording. Communications channel characteristics are examined to determine whether an sample was recorded on a different channel from a predetermined communications channel. A pattern classifier is trained to distinguish between live and recorded speech. Finally, an "audio watermark" is used to determine whether a detected audio sample is a recording of a previous communication by an authorized user. In addition, the various techniques of the present invention may be employed in serial or parallel combination with a variety of decisionmaking schemes to provide increased performance.
Inventors:
Sharma, Mannish
Mamone, Richard, Jay.
Mamone, Richard, Jay.
Application Number:
JP53305398A
Publication Date:
May 14, 2002
Filing Date:
January 29, 1998
Export Citation:
Assignee:
Teenetics, Inc.
International Classes:
G07C9/00; G10L15/26; G10L17/22; G10L17/26; G10L17/00; (IPC1-7): G10L17/00; G10L13/06
Attorney, Agent or Firm:
Akira Asamura (3 outside)