Pattern recognition method
US4559604A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1981 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Sep 21, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F18/254
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a machine implemented voice recognition method, as a first step speech signals are analyzed for feature vectors which are used to compare input signals with prestored reference signals. Patterns of any suitable form are used to calculate a similarity distance measure d.sub.IJ which is tested against a threshold to select likely candidates as a first step. A second step selects the most likely candidate by using "common nature" parameters of phonemes such as relative occurrence. Five embodiments of the second step are disclosed, each using a "common nature" criteria of inference to infer (select) the most likely candidate: PA1 (1) d'.sub.I =W.sub.1,.W.sub.2.W.sub.3 where W is a weighting factor; PA1 (2) d".sub.I =C.sub.I d'.sub.I where C.sub.I is a correction factor; PA1 (3) max p(i,j) where p(i) is the probability of occurrence of the i.sup.th phoneme; PA1 (4) min d'.sub.ij as a variation of max p(i,j); and PA1 (5) N(i) is the numerical similarity of the common characteristics of the selected candidates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.