Apparatus and method for generating RF signal and control signals in optical disc system
US6879551B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 2002 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Mar 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0908
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for generating a radio frequency (RF) signal and control signals are provided. In an apparatus for generating a radio frequency (RF) signal and control signals in which the current output from a plurality of light receiving elements is converted into voltage signals and the RF signal and the control signals are generated in response to the voltage signals, the apparatus includes an input data processing unit, a digital filter, a servo signal generating unit, a digital RF data generating unit, and a reference comparator. The input data processing unit performs time-sharing sampling on the voltage signals and converts the voltage signals into first digital signals in response to an analog/digital conversion clock signal having a predetermined period and a sequentially applied selection signal. The digital filter filters each of the first digital signals to modify the shape of the waveforms of the first digital signals and outputs the modified waveforms as second digital signals. The servo signal generating unit corrects delay time of the second digital signals and generates the control signals for servo control in response to the corrected signals. The digital…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.