DVD EFM modulation architecture using two passes to reduce circuit size
US7843366B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2005 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Sep 30, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1461
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for modulating a video input signal received into a modulation circuit is disclosed. A first step of the method generally comprises (A) during a first modulation pass, generating (i) a primary frame by inserting a plurality of primary synchronization codes into the video input signal, (ii) a secondary frame by inserting a plurality of secondary synchronization codes into the video input signal, (iii) a plurality of first values and a first digital sum value both for the primary frame and (iv) a plurality of second values and a second digital sum value both for the secondary frame. A second step of the method generally comprises (B) during a second modulation pass, generating a video output signal presented from the modulation circuit by modulating the video input signal using one set of (i) the first values and (ii) the second values as determined by the first digital sum value relative to the second digital sum value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.