Speech recognition method
US4803729A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Apr 3, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L15/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Smoothed frame labeling associates phonetic frame labels with a given speech frame as a function of (a) the closeness with which the given frame compares to each of a plurality of acoustic models, (b) which frame labels correspond with a neighboring frame, and (c) transition probabilities which indicate, for the frame labels associated with the neighboring frame, which frame labels are probably associated with the given frame. The smoothed frame labeling is used to divide the speech into segments of frames having the same class of labels. The invention represents words as a collection of known diphone models, each of which models the sound before and after a boundary between segments derived by the smoothed frame labeling. At recognition time, the speech is divided into segments by smoothed frame labeling; diphone models are derived for each boundary between the resulting segments; and the resulting diphone models are compared against the known diphone models to determine which of the known diphone models match the segment boundaries in the speech. Then a combined-displaced-evidence method is used to determine which words occur in the speech. This method detects which acoustic patt…
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