Method for improving the coding efficiency of an audio signal
US7457743B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 2005 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Dec 8, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/09
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Coding an audio signal includes selecting a reference sequence that has the smallest error relative to a sequence of the audio signal, calculating pitch predictor coefficients for the selected reference sequence using one of a set of pitch predictor orders, producing a predicted sequence from the selected reference sequence using the calculated pitch predictor coefficients, and calculating a coding error by comparing the predicted sequence to the sequence to be coded. Coding also includes calculating pitch predictor coefficients for the selected reference sequence, producing a predicted sequence from the selected reference sequence, and calculating a coding error by comparing the predicted sequence to the sequence to be coded, for each of the remaining orders of the set of pitch predictor orders, and using an order from the set of pitch predictor orders that results in the smallest coding error to select a coding method for the sequence to be coded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.