Formant detecting device and speech processing apparatus
US5479560A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1993 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Oct 27, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2225/43
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A speech processing apparatus for obtaining a processed speech which is natural and comfortable for a listener, by refining a gain value assigned for each frequency band in enhancing formants in a power spectrum. The power spectrum, calculated in a frequency analyzing unit, is subject to contrast enhancement in a contrast enhancing unit, and judged as to whether it is a format or not in each frequency band. In a gain value assigning unit, a gain value of 1 is assigned to a formant, and a gain value smaller than 1 is to a frequency other than formant. A threshold value for each frequency band is determined by a threshold value determining unit in accordance with power spectrum of input speech signal, to eliminate the effect of variation in speech level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.