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Title: US6314396: Automatic gain control in a speech recognition system
[ Derwent Title ]

Country: US United States of America

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10 pages

Inventor: Monkowski, Michael D.; New Windsor, NY

Assignee: International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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Published / Filed: 2001-11-06 / 1998-11-06

Application Number: US1998000187439

IPC Code: Advanced: G10L 15/20; G10L 15/02;
Core: G10L 15/00;
IPC-7: G10L 11/02;
G10L 15/00;

ECLA Code: G10L15/20;

U.S. Class: Current: 704/233; 704/234; 704/E15.039;
Original: 704/233; 704/234;

Field of Search: 704/214,215,208,210,226-228,233,234,255,256,252

Priority Number:
1998-11-06  US1998000187439

Abstract:     Energy normalization in a speech recognition system is achieved by adaptively tracking the high, mid, and low energy envelopes, wherein the adaptive high energy tracking value adapts with weighting enhanced for high energies, and the adaptive low energy tracking value adapts with weighting enhanced for low energies. A tracking method is also provided for discriminating waveform segments as being one of "speech" or "silence", and a measure of the signal to noise ratio and absolute noise floor are used as feedback means to achieve optimal speech recognition accuracy.

Attorney, Agent or Firm: F. Chau & Associates, LLP ;

Primary / Asst. Examiners: Knepper, David D.;

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First Claim:
Show all 21 claims
What is claimed is:     1. A speech recognition preprocessor, comprising:
  • an analyzer for receiving a digital speech signal generating therefrom a sequence of frames, each frame having a plurality of samples from said digital speech signal;
  • means coupled to said analyzer means for tracking an upper energy envelope, an average energy envelope, and a lower energy envelope by a plurality of energy tracks in one or more consecutive frames of said digital speech signal, wherein said energy tracks are based on a high biased running mean, a low biased running mean and a nominally unbiased running mean; and
  • means coupled to said tracking means for computing a normalized energy value and providing said normalized energy value to a speech recognition system.

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Forward References: Show 25 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (25)   |   Backward references (12)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 10pp US4028496  1977-06 LaMarche et al.  Bell Telephone Laboratories, Incorporated Digital speech detector
Get PDF - 15pp US4277645  1981-07 May, Jr.  Bell Telephone Laboratories, Incorporated Multiple variable threshold speech detector
Get PDF - 16pp US4331837  1982-05 Soumagne   Speech/silence discriminator for speech interpolation
Get PDF - 10pp US4696039  1987-09 Doddington  Texas Instruments Incorporated Speech analysis/synthesis system with silence suppression
Get PDF - 11pp US4696040  1987-09 Doddington et al.  Texas Instruments Incorporated Speech analysis/synthesis system with energy normalization and silence suppression
Get PDF - 10pp US4807167  1989-02 Green, Jr.  General Electric Company Rapid method of digital automatic gain control
Get PDF - 12pp US4817158  1989-03 Picheny  International Business Machines Corporation Normalization of speech signals
Get PDF - 29pp US5195138  1993-03 Kane et al.  Matsushita Electric Industrial Co., Ltd. Voice signal processing device
Get PDF - 18pp US5598505  1997-01 Austin et al.  Apple Computer, Inc. Cepstral correction vector quantizer for speech recognition
Get PDF - 11pp US5689615  1997-11 Benyassine et al.  Rockwell International Corporation Usage of voice activity detection for efficient coding of speech
Get PDF - 19pp US5937375  1999-08 Nakamura  Denso Corporation Voice-presence/absence discriminator having highly reliable lead portion detection
Get PDF - 9pp US6076057  2000-06 Narayanan et al.  AT&T Corp Unsupervised HMM adaptation based on speech-silence discrimination
Foreign References:
Publication Date IPC Code Assignee   Title
  JP62290258 1987-12       
  JP02053369 1990-02       
  JP02189061 1990-07       
  JP03029555 1991-02       

Other Abstract Info: DERABS G2000-424532

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