Demagnetizing apparatus for erasing signals recorded on concentric tracks
US4821127A · kind A · utility
15Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1986 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Oct 20, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A demagnitizing apparatus erases, track by track, wide-band and high-frequency recorded signals such as signals which are frequency-modulated (FM) with video signals, and thus eliminates the need for a relay to switch a single magnetic head between erasing capability and recording or reproducing capability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.