Speech decoding method and apparatus
US5752222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1996 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Oct 23, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/26
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A speech decoding method and apparatus for decoding encoded speech signals and subsequently post-filtering the decoded signals, wherein the filter coefficient of a spectral shaping filter in a post-filter fed with an encoded and subsequently decoded speech signal is updated with a sub-frame period, while the gain of a gain adjustment circuit for correcting gain changes caused by the spectral shaping is updated with a frame period that is eight times as long as the sub-frame period. This achieves switching of the filter coefficient so as to be changed smoothly with a higher follow-up speed, while suppressing level changes otherwise caused by frequent gain switching. The result is improved characteristics of a post-filter used for spectral shaping of a decoded signal supplied from the signal decoder and more effective post-filter processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.