Servo data decoder for any amplitude dependent servo data encoding scheme
US4740736A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Jul 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59616
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed herein a servo data decoder which can decode both quadrature and non quadrature servo data. The decoder is comprised of a servo data amplitude demodulator to generate position error signals and a position error signal processor to generate a GPES signal to serve as a position error signal during the track following mode and a velocity signal and a track crossing signal for use in the seek mode. The user system may have either single or double pulse sync, and double pulse sync spacing, pulse window time and sync to first data pulse delay are user definable. The user may adjust the gain of the system in two manners and may program the frequency response characteristics of the phase locked loop. Many other user definable or user alterable features are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.