Optimized scale factor for frequency band extension in an audio frequency signal decoder
US10943594B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2019 |
| Grant date | Mar 9, 2021 |
| Priority date | — |
| Expiry date | Aug 21, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/72
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and device are provided for determining an optimized scale factor to be applied to an excitation signal or a filter during a process for frequency band extension of an audio frequency signal. The band extension process includes decoding or extracting, in a first frequency band, an excitation signal and parameters of the first frequency band including coefficients of a linear prediction filter, generating an excitation signal extending over at least one second frequency band, filtering using a linear prediction filter for the second frequency band. The determination method includes determining an additional linear prediction filter, of a lower order than that of the linear prediction filter of the first frequency band, the coefficients of the additional filter being obtained from the parameters decoded or extracted from the first frequency and calculating the optimized scale factor as a function of at least the coefficients of the additional filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.