Speaker-independent word recognizer
US4712242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1983 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Apr 13, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L15/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Speaker-independent word recognition is performed, based on a small acoustically distinct vocabulary, with minimal hardware requirements. After a simple preconditioning filter, the zero crossing intervals of the input speech are measured and sorted by duration, to provide a rough measure of the frequency distribution within each input frame. The distribution of zero crossing intervals is transformed into a binary feature vector, which is compared with each reference template using a modified Hamming distance measure. A dynamic time warping algorithm is used to permit recognition of various speaker rates, and to economize on the reference template storage requirements. A mask vector with each reference vector on a template is used to ignore insignificant (or speaker-dependent) features of the words detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.