Apparatus and method for coding speech signals by making use of an adaptive codebook
US6345255B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 2000 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Jul 21, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/18
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An audio signal encoding device is provided including an input for receiving a sub-frame of an audio signal to be encoded, an adaptive codebook and a processing unit. The adaptive codebook stores at least one prior knowledge entry which includes a data element representative of characteristics of at least a portion of a previously generated audio signal sub-frame. The processing unit generates a set of parameters allowing for synthesization of the audio signal sub-frame received at the input on the basis of at least the sub-frame of the audio signal received at the input and the data element stored in the adaptive codebook. A corresponding decoding device for synthesizing an audio signal on the basis of a set of parameters is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.