System and method for detecting and inhibiting cycle slip for multi-channel media drive
US8922927B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2013 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Oct 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/00813
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for inhibiting cycle slip in a tape drive having at least three channels that each utilizes a corresponding numerically controlled oscillator includes establishing a reference clock that is based on an output of the numerically controlled oscillators for at least two of the channels, comparing the output of the numerically controlled oscillator for one of the three channels with the reference clock to determine a first channel phase delta value for the one channel, and generating an error signal for the one channel if the channel phase delta value exceeds a threshold phase delta value for the one channel. The method may also include applying an inhibition loop filter to the error signal for the one channel if the first channel phase delta value exceeds the threshold phase delta value, adjusting a gain of the inhibition loop filter based at least partially upon one of the first channel phase delta value and the threshold phase delta value, and/or feeding back the error signal to the numerically controlled oscillator of the one channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.