Servo system having track crossing detection for an optical disk drive system
US6320828A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1999 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Jul 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08529
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A difference counter in a servo system includes RX signal processing circuitry, TX signal processing circuitry, and a latch. The RX processing circuitry includes a RX z-hold (zero order) circuit, a RX delay circuit coupled thereto, and a RX XOR logic circuit coupled thereto for producing an RX processed signal. The TX processing circuitry includes a TX z-hold circuit, a TX delay circuit coupled thereto, and a TX XOR logic circuit coupled thereto for producing an TX processed signal. The RX and TX processed signals are fed into the latch which, in response, generates a noise-free quarter track signal. Half and full track signals are generated therefrom to further process the signal track information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.