Combined speed control and sectoring index for disc recorders and the like
US4146910A · kind A · utility
8Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1977 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Apr 21, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The specification discloses a method and apparatus for providing speed control and rotational indexing of a disc recorder, based upon a particular use of a plurality of electrical pulses produced, for example, as the slots of a slotted wheel, axially coupled to a recording disc, pass a transducer. The primary repetition rate of pulses in response to equally-spaced slots is used for speed control of the recording disc. A secondary pulse rate occurring between two successive pulses resulting from adjacent slots with different spacing is used to establish an index pulse correlated with a reference point on the disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.