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Title: US4748670: Apparatus and method for determining a likely word sequence from labels generated by an acoustic processor
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Country: US United States of America

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54 pages

Inventor: Bahl, Lalit R.; Amawalk, NY
Jelinek, Frederick; Briarcliff, 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: 1988-05-31 / 1985-05-29

Application Number: US1985000738911

IPC Code: Advanced: G10L 15/14;
IPC-7: G10L 5/00;

ECLA Code: G10L15/14; T05K999/99;

U.S. Class: Current: 704/256.1;
Original: 381/043;

Field of Search: 381/041-43 364/513.5

Priority Number:
1985-05-29  US1985000738911

Abstract:     Continuous speech recognition is improved by use of a known vocabulary and context probabilities. First, the unknown utterance is analyzed as a sequence of phonemes, then each phoneme labelled to form a string of labels. The shortest label interval which is recognized as a word is assigned a storage stack where similar-sounding candidate words are stored. Multiple stack decoding, and liklihood envelope criteria for word path extension decisions, are further features of the system.

Attorney, Agent or Firm: Block, M. A. ;

Primary / Asst. Examiners: Kemeny, Emanuel S.;

Maintenance Status: E3 Expired  Check current status

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First Claim:
Show all 17 claims
We claim:     1. In a speech recognition system having an acoustic processor which generates a string of acoustic labels in response to speech input and a decoder which matches words in a vocabulary against generated labels in a string, a method of forming at least one likely sequence of words for a speech input, the method comprising the steps of:
  • (a) generating a string of labels in response to a speech input;
  • (b) selecting words from a vocabulary as possible first words corresponding to labels at the beginning of the string;
  • (c) for a subject selected word,
    • (i) locating a most likely boundary label interval in the string whereat the subject selected words has the highest probability of ending; and
    • (ii) evaluating a respective likelihood of the subject selected word at each label interval of the string up to and including the most likely boundary label interval;
  • (d) repeating step (c) for each selected word as the subject selected word; and
  • (e) classifying a given selected word as extendible if the likelihood at the particular label interval corresponding to the most likely boundary label interval thereof is within a predefined range of the highest likelihood for any selected word at said particular label interval.

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Forward References: Show 39 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (39)   |   Backward references (13)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 42pp USRE31188  1983-03 Pirz et al.  Bell Telephone Laboratories, Incorporated Multiple template speech recognition system
Get PDF - 21pp US3188609* 1965-06 Harmon et al.    
Get PDF - 9pp US3202761  1965-08 Bibbero   Waveform identification system
Get PDF - 10pp US3344233* 1967-09 Wellesley    
Get PDF - 14pp US3883850  1975-05 Martin et al.  Threshold Technology, Inc. Programmable word recognition apparatus
Get PDF - 50pp US3969700  1976-07 Bollinger et al.  International Business Machines Corporation Regional context maximum likelihood error correction for OCR, keyboard, and the like
Get PDF - 20pp US4059725  1977-11 Sakoe  Nippon Electric Company, Ltd. Automatic continuous speech recognition system employing dynamic programming
Get PDF - 14pp US4256924  1981-03 Sakoe  Nippon Electric Co., Ltd. Device for recognizing an input pattern with approximate patterns used for reference patterns on mapping
Get PDF - 34pp US4277644  1981-07 Levinson et al.  Bell Telephone Laboratories, Incorporated Syntactic continuous speech recognizer
Get PDF - 20pp US4286115  1981-08 Sakoe  Nippon Electric Co., Ltd. System for recognizing words continuously spoken according to a format
Get PDF - 18pp US4319221  1982-03 Sakoe  Nippon Electric Co., Ltd. Similarity calculator comprising a buffer for a single input pattern feature vector to be pattern matched with reference patterns
Get PDF - 48pp US4336421  1982-06 Welch et al.  Threshold Technology, Inc. Apparatus and method for recognizing spoken words
Get PDF - 34pp US4400788  1983-08 Myers et al.  Bell Telephone Laboratories, Incorporated Continuous speech pattern recognizer
  * some details unavailable
Foreign References: None

Other References:
  • L. R. Bahl et al., "Faster Acoustic Match Computation", IBM Technical Disclosure Bulletin, vol. 23, No. 4, Sep. 1980, pp. 1718-1719.
  • F. Jelinek, "Continuous Speech Recognition by Statistical Methods", Proceedings of the IEEE, vol. 64, No. 4, pp. 532-556, Apr. 1976. (25 pages) Cited by 30 patents
  • L. R. Bahl et al., "A Maximum Likelihood Approach to Continuous Speech Recognition", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-5, No. 2, pp. 179-190, Mar. 1983. (12 pages) Cited by 42 patents
  • F. Jelinek et al., "Design of a Linguistic Statistical Decoder for the Recognition of Continuous Speech", IEEE Transactions on Information Theory, vol. IT-21, No. 3, pp. 250-256, New York, U.S., May 1975. (7 pages) Cited by 3 patents

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