Analysis-by-synthesis speech coding method with truncation of the impulse response of a perceptual weighting filter
US5963898A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Oct 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2019/0012
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A linear prediction analysis is performed for each frame of a speech signal to determine the coefficients of a short-term synthesis filter and an open-loop analysis is performed to determine a degree of frame voicing. At least one closed-loop analysis is performed for each sub-frame to determine an excitation sequence which, when applied to the short-term synthesis filter, generates a synthetic signal representative of the speech signal. Each closed-loop analysis uses the impulse response of a filter consisting of the short-term synthesis filter and a perceptual weighting filter, by truncating the impulse response to a truncation length that is no greater than the number of samples per sub-frame and is dependent on the energy distribution of the response and the degree of voicing of the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.