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Title: US5522011: Speech coding apparatus and method using classification rules
[ Derwent Title ]


Country: US United States of America

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17 pages

 
Inventor: Epstein, Mark E.; Katonah, NY
Gopalakrishnan, Ponani S.; Yorktown Heights, NY
Nahamoo, David; White Plains, NY
Picheny, Michael A.; White Plains, NY
Sedivy, Jan; Hartsdale, 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: 1996-05-28 / 1993-09-27

Application Number: US1993000127392

IPC Code: Advanced: G10L 15/02; G10L 19/00; G10L 19/02; H03M 7/30; H04B 14/04;
IPC-7: G10L 5/06;

ECLA Code: G10L19/038;

U.S. Class: Current: 704/222; 704/E19.017;
Original: 395/002.31;

Field of Search: 395/2.54,2.31 381/036

Priority Number:
1993-09-27  US1993000127392

Abstract:     A speech coding apparatus and method uses classification rules to code an utterance while consuming fewer computing resources. The value of at least one feature of an utterance is measured during each of a series of successive time intervals to produce a series of feature vector signals representing the feature values. The classification rules comprise at least first and second sets of classification rules. The first set of classification rules map each feature vector signal from a set of all possible feature vector signals to exactly one of at least two disjoint subsets of feature vector signals. The second set of classification rules map each feature vector signal in a subset of feature vector signals to exactly one of at least two different classes of prototype vector signals. Each class contains a plurality of prototype vector signals. According to the classification rules, a first feature vector signal is mapped to a first class of prototype vector signals. The closeness of the feature value of the first feature vector signal is compared to the parameter values of only the prototype vector signals in the first class of prototype vector signals to obtain prototype match scores for the first feature vector signal and each prototype vector signal in the first class. At least the identification value of at least the prototype vector signal having the best prototype match score is output as a coded utterance representation signal of the first feature vector signal.

Attorney, Agent or Firm: Whitham, Curtis, Whitham & McGinn ; Tassinari, Robert P. ;

Primary / Asst. Examiners: MacDonald, Allen R.; Onka, Thomas J.

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Designated Country: DE FR GB 

Family: Show 8 known family members

First Claim:
Show all 25 claims
We claim:     1. A speech coding apparatus comprising:
  • means for measuring the value of at least one feature of an utterance during each of a series of successive time intervals to produce a series of feature vector signals representing the feature values;
  • means for storing a plurality of prototype vector signals, each prototype vector signal having at least one parameter value and having an identification value, at least two prototype vector signals having different identification values;
  • classification rules means for storing classification rules mapping each feature vector signal from a set of all possible feature vector signals to exactly one of at least two different classes of prototype vector signals, each class containing a plurality of prototype vector signals and each class of prototype vector signals is at least partially different from other classes of prototype vector signals, wherein each class of prototype vector signals contains less than 1/N times the total number of prototype vector signals in all classes, where 5<=N<=150;
  • classifier means for mapping, by the classification rules, a first feature vector signal to a first class of prototype vector signals;
  • means for comparing the closeness of the feature value of the first feature vector signal to the parameter values of only the prototype vector signals in the first class of prototype vector signals to obtain prototype match scores for the first feature vector signal and each prototype vector signal in the first class; and
  • means for outputting at least the identification value of at least the prototype vector signal having the best prototype match score as a coded utterance representation signal of the first feature vector signal.


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Forward References: Show 22 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (22)   |   Backward references (9)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 20pp US4715004  1987-12 Kabasawa et al.  Matsushita Electric Industrial Co., Ltd. Pattern recognition system
Get PDF - 11pp US4907276  1990-03 Aldersberg  The DSP Group (Israel) Ltd. Fast search method for vector quantizer communication and pattern recognition systems
Get PDF - 17pp US4958375  1990-09 Reilly et al.  Nestor, Inc. Parallel, multi-unit, adaptive pattern classification system using inter-unit correlations and an intra-unit class separator methodology
Get PDF - 45pp US4980918  1990-12 Bahl et al.  International Business Machines Corporation Speech recognition system with efficient storage and rapid assembly of phonological graphs
Get PDF - 12pp US5067152  1991-11 Kisor et al.  Information Technologies Research, Inc. Method and apparatus for vector quantization
Get PDF - 9pp US5144671  1992-09 Mazor et al.  GTE Laboratories Incorporated Method for reducing the search complexity in analysis-by-synthesis coding
Get PDF - 27pp US5182773  1993-01 Bahl et al.  International Business Machines Corporation Speaker-independent label coding apparatus
Get PDF - 28pp US5327520  1994-07 Chen  AT&T Bell Laboratories Method of use of voice message coder/decoder
Get PDF - 45pp US5345536  1994-09 Hoshimi et al.  Matsushita Electric Industrial Co., Ltd. Method of speech recognition
       
Foreign References:
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Publication Date IPC Code Assignee   Title
Get PDF - 16pp EP0535380A2 1992-08  G10L 5/00 IBM Speech coding apparatus 
Get PDF - 17pp EP0538626A2 1992-09  G10L 3/00 IBM Speech recognition apparatus having a speech coder outputting acoustic prototype ranks 
Get PDF - 18pp EP0545083A2 1992-11  G10L 5/06 IBM A speech coding apparatus having speaker dependent prototypes generated from nonuser reference data 


Other Abstract Info: DERABS G95-124831

Other References:
  • Bahl, L. R., et al. "Vector Quantization Procedure For Speech Recognition Systems Using Discrete Parameter Phoneme-Based Markov Word Models." , IBM Technical Disclosure Bulletin, vol. 32, No. 7, Dec. 1989, pp. 320-321.
  • Jelinek, F. "Continuous Speech Recognition by Statistical Methods." Proceedings of the IEEE, vol. 64, No. 4, Apr. 1976, pp. 532-556. (25 pages) Cited by 30 patents
  • Nadas, A., et al. "An Iterative Flip-Flop Approximation of the Most Informative Split in the Construction of Decision Trees." 1991 International Conference on Acoustics, Speech and Signal Processing, pp. 565-568.


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