Conversion of synthesized spectral components for encoding and low-complexity transcoding
US7318027B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2003 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Oct 17, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/173
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an audio coding system, an encoding transmitter represents encoded spectral components as normalized floating-point numbers. The transmitter provides first and second control parameters that may be used to transcode the encoded spectral parameters. A transcoder uses first control parameters to partially decode the encoded components and uses second control parameters to re-encode the components. The transmitter determines the second control parameters by analyzing the effects of arithmetic operations in the partial-decoding process to identify situations where the floating-point representations lose normalization. Exponents associated with the numbers that lose normalization are modified and the modified exponents are used to calculate the second control parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.