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Title: US5475792: Telephony channel simulator for speech recognition application
[ Derwent Title ]


Country: US United States of America

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15 pages

 
Inventor: Stanford, Vince M.; Gaithersburg, MD
Brickman, Norman F.; Potomac, MD

Assignee: International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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Published / Filed: 1995-12-12 / 1994-02-24

Application Number: US1994000201157

IPC Code: Advanced: G06F 3/16; G10L 15/00; G10L 15/06; H04B 14/04; G10L 15/02; G10L 15/14; G10L 15/20; G10L 19/00;
IPC-7: G01L 9/00;

ECLA Code: G10L15/063; S10L15/14M; S10L15/20; S10L25/06; S10L25/24;

U.S. Class: Current: 704/233; 704/227; 704/254; 704/256; 704/256.2; 704/E15.008;
Original: 395/002.42; 395/002.63; 395/002.65; 395/002.36;

Field of Search: 381/029-45 395/2.1,2.2-2.25,2.35-2.37,2.4-2.65 375/122,25,27

Priority Number:
1994-02-24  US1994000201157
1992-09-21  US1992000948031

Abstract:     A telephony channel simulation process is disclosed for training a speech recognizer to respond to speech obtained from telephone systems. An input speech data set is provided to a speech recognition training processor, whose bandwidth is higher than a telephone bandwidth. The process performs a series of alterations to the input speech data set to obtain a modified speech data set. The modified speech data set enables the speech recognition processor to perform speech recognition on voice signals from a telephone system.

Attorney, Agent or Firm: Hoel, John E. ; McKinley, Martin J. ;

Primary / Asst. Examiners: MacDonald, Allen R.; Doerrler, Michelle

Maintenance Status: E1 Expired  Check current status

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1992000948031 1992-09-21       


       
Parent Case:     This is a continuation of prior application Ser. No. 07/948,031, filed Sep. 21, 1992, now abandoned.

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First Claim:
Show all 7 claims
We claim:     1. A method for training a speech recognition processor to respond to speech obtained from telephone systems, comprising the steps of:
  • inputting a speech data set to a speech recognition training processor, said data set having a bandwidth higher than a telephone bandwidth;
  • decimating said inputted speech data set in said training processor to obtain a decimated speech data set having said telephone bandwidth;
  • applying a bandpass digital filter to said decimated speech data set in said training processor, said filter characterizing transmission characteristics of telephone equipment, for obtaining a filtered speech data set;
  • rescaling the amplitude of said filtered speech data set in said training processor, so that the maximum dynamic range of said filtered speech data set matches the maximum dynamic range of uncompanded telephone speech, to obtain a rescaled speech data set;
  • modifying said rescaled speech data set in said training processor, with quantization noise representing companding and uncompanding a speech signal in a telephone system, to obtain a modified speech data set;
  • inputting said modified speech data set into a hidden Markov model speech recognition processor to train statistical pattern matching data units;
  • performing speech recognition on voice signals from a telephone system with said speech recognition processor.


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Forward References: Show 163 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (163)   |   Backward references (21)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 13pp US4069393  1978-01 Martin et al.  Threshold Technology, Inc. Word recognition apparatus and method
Get PDF - 17pp US4087630  1978-05 Browning et al.  Centigram Corporation Continuous speech recognition apparatus
Get PDF - 15pp US4144582  1979-03 Hyatt   Voice signal processing system
Get PDF - 19pp US4461024  1984-07 Rengger et al.  The Secretary of State for Industry in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland Input device for computer speech recognition system
Get PDF - 27pp US4481593  1984-11 Bahler  Exxon Corporation Continuous speech recognition
Get PDF - 24pp US4489435  1984-12 Moshier  Exxon Corporation Method and apparatus for continuous word string recognition
Get PDF - 16pp US4718088  1988-01 Baker et al.  Exxon Research and Engineering Company Speech recognition training method
Get PDF - 27pp US4720802  1988-01 Damoulakis et al.  Lear Siegler Noise compensation arrangement
Get PDF - 50pp US4783803  1988-11 Baker et al.  Dragon Systems, Inc. Speech recognition apparatus and method
Get PDF - 22pp US4805218  1989-02 Bamberg et al.  Dragon Systems, Inc. Method for speech analysis and speech recognition
Get PDF - 15pp US4829572  1989-05 Kong  Chung; Andrew Ho Speech recognition system
Get PDF - 11pp US4856066  1989-08 Lemelson   Speech communication system and method
Get PDF - 27pp US4897878  1990-01 Boll et al.  ITT Corporation Noise compensation in speech recognition apparatus
Get PDF - 8pp US4905286  1990-02 Sedgwick et al.  National Research Development Corporation Noise compensation in speech recognition
Get PDF - 6pp US4922538  1990-05 Tchorzewski  British Telecommunications public limited company Multi-user speech recognition system
Get PDF - 18pp US4933973  1990-06 Porter  ITT Corporation Apparatus and methods for the selective addition of noise to templates employed in automatic speech recognition systems
Get PDF - 19pp US4956871  1990-09 Swaminathan  AT&T Bell Laboratories Improving sub-band coding of speech at low bit rates by adding residual speech energy signals to sub-bands
Get PDF - 48pp US5027406  1991-06 Roberts et al.  Dragon Systems, Inc. Method for interactive speech recognition and training
Get PDF - 12pp US5036538  1991-07 Oken et al.  Telephonics Corporation Multi-station voice recognition and processing system
Get PDF - 10pp US5068899  1991-11 Ellis et al.  Northern Telecom Limited Transmission of wideband speech signals
Get PDF - 21pp US5105463  1992-04 Veldhuis et al.  U.S. Philips Corporation System for subband coding of a digital audio signal and coder and decoder constituting the same
       
Foreign References:
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Publication Date IPC Code Assignee   Title
Get PDF - 48pp EP0215573 1985-08  G10L 5/06 NAT RES DEV Apparatus and methods for speech recognition 


Other Abstract Info: DERABS G94-275052

Other References:
  • Takebayashi et al., "Telephone Speech Recognition Using A Hybrid Method", ICPR (International Conference of Pattern Recognition), Dec. 1989, pp. 1232-1235.
  • IEEE Article by K. F. Lee & H. W. Hon, "Large Vocabulary Speaker Independent Continuous Speech Recognition Using HMM," 1988, pp. 123-126, (CH2561-9/88/00000-0123).


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