(12) UIlIt€(l St3t€S Patent (10) Patent N0.: US 6,711,541 B1 Kuhn et al. (45) Date 0f Patent: Mar. 23, 2004
Roland Kuhn, Santa Barbara, CA (US);
J ean-Claude Junqua, Santa Barbara,
CA (US); Matteo C0nt0lini, Santa
Barbara, CA (US)
Assignee: Matsushita Electric Industrial Co.,
Ltd., Osaka (JP)
Notice: Subject to any disclaimer, the term of this
patent is extended or adjusted under 35
U.S.C. 154(b) by 0 days.
Appl. No.: 09/390,434
Filed: Sep. 7, 1999
Int. Cl.7 . G10L 15/04; G10L 15/06
U.S. Cl. . 704/242; 704/243; 704/254
Field of Search ............................... .. 704/236, 237,
W. Chou and W. Reichl, “Decision tree state tying based on penalized Bayesian information criterion”, Int. Conf. On Acoustics, Speech, and Signal Processing (ICASSP-99), V. 1, pp. 345-348, Phoenix, Arizona, 1999.
W. Reichl and W. Chou, “A unified approach of incorporating general features in decision tree based acoustic modeling”, Int. Conf on Acoustics and Signal Processing (ICASSP-99), V. 2, pp. 573-576, Phoenix, Arizona, 1999.
K. Sjolander and J . Hogberg, “Using expanded question sets in decision tree clustering for acoustic modeling”, IEEE Workshop on Automatic Speech Recognition and Understanding, pp. 179-183, Santa Barbara, CA, Dec. 1997.
Primary Examiner—Vij ay ChaWan
Assistant Examiner—Abul K. Azad
(74) Attorney, Agent, or Firm—Harness, Dickey & Pierce, PLC
A set of models is developed to represent sound units and these models are then used With the incorrect sound units to determine Which generate high likelihood scores. The models generating high likelihood scores for the incorrect sound units represent those that are more likely to be confused. The resulting confusability data may then be used in generating more discriminative speech models and in subsequent pruning of the acoustic decision tree. The confusability data may also be used to develop confusability predictors used for rejection during search and in developing continuous speech recognition models that are optimized to minimize confusability.
13 Claims, 7 Drawing Sheets