Systems and methods for determining pitch lag for a current frame of information
US7933767B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 2004 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Apr 20, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods, computer code products, devices, modules, systems, and encoders are disclosed which are configured to use an adaptive lag search window for determining a lag estimate for a current frame of information in an audio encoding system. The system can determine if the lag estimate is reliable and if not a new search window can be selected and a new lag estimate can be calculated based on the new search window. An adaptive threshold can be compared to the cross correlation for a lag estimate in order to determine whether the lag estimate is reliable. The system can also determine if an encoding gain is likely to be achieved using the prediction and if not, the computationally expensive time-to-frequency transformation can be avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.