Speech recognition method and apparatus
US4489434A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1981 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Oct 5, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L15/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A speech recognition method and apparatus for detecting and recognizing one or more keywords in a continuous audio signal are disclosed. Each keyword is represented by a keyword template which corresponds to a sequence of plural target patterns, and each target pattern comprises statistics representing each of a plurality of spectra selected from plural short-term spectra generated according to a predetermined system for processing the incoming audio. The target patterns also have associated therewith minimum and maximum dwell times. The dwell time is the time interval during which a given target pattern can be said to match incoming frame patterns. The spectra are processed to enhance the separation between the spectral pattern classes during later analysis. The processed audio spectra are grouped into multi-frame spectral patterns and each multi-frame spectral pattern is compared by means of likelihood statistics with the target patterns of keyword templates. Each formed multi-frame pattern is then forced to contribute to the total word score for each keyword as represented by the keyword template. Thus the keyword recognition method requires all input patterns to contribute to t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.