Reproduction device and method wherein detection of sub-data generated within a controlled time period controls appropriate decryption
US7564756B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2004 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Jun 4, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/10972
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reproducing device includes a detection circuit and an integration circuit. The detection circuit detects a push-pull signal PP. The integration circuit carries out integration processing with respect to one or greater frames of the push-pull signal, and carries out binarization processing with respect to integration results thus obtained, thereby detecting sub data. In the integration circuit, the more the frames to be used for detecting sub data is, the higher the accuracy of the detected sub data is. The reproducing device further includes a control circuit for controlling the total number of the frames to be used for generating valid sub data in the integration circuit. The control circuit controls the total number of the frames in accordance with a result of an error correction made by an error correction circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.