Videorecorder with rotating head drum and video heads
US4914531A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1989 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Jan 30, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/1875
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns a videorecorder with a rotating head drum (KT) that has video heads (K1 & K2) with a magnetic tape (B) looped partly around them mounted on it, with at least one pulse generator (M) mounted on the head drum, with at least one sensor (S) that generates a head-shift signal that switches from one video head to the other, and with a control head (KK) for scanning the vertical-synchronization signal during playback. In the playback mode the time between the signal supplied to the sensor and the vertical-synchronization signal is measured and compared with a reference, and a criterion for controlling the position in time of the head-shift signal is derived from the comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.