Method and apparatus for recording and reading variable speed data using a rotating drum device
US5784215A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Aug 12, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/0086
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for recording and replaying variable speed data uses a rotating drum device. When information to be recorded is presented to the transfer rate of the information, be recorded is determined. If this information is not presented at a standard information transfer rate (N), it is converted to that standard rate. If the information not only is not at the standard rate N, but is outside a predetermined amount from that standard rate, the travel speed of the magnetic medium is slowed and the activation sequence of the magnetic recording head is altered. In the case where the information to be recorded is at a rate outside of the predetermined rate, the magnetic medium travel speed is reduced from the standard speed (L/T) in relation to the information transfer rate of the information to be recorded. If the tape speed is reduced to L/XT, then the activation sequence is every Xth head. During replay, the information is read from the medium at the standard information transfer rate and the medium travel speed and the head activation sequence are altered accordingly, if necessary. The information is then converted to the original information transfer rate by digital ci…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.