Magnetic recording/reproducing apparatus utilizing phase comparator
US4825299A · kind A · utility
31Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Aug 31, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/89
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic video recording/reproducing apparatus of high resolution, which excludes a phase difference introduced to a signal due to difference in characteristics between a low frequency conversion system and a high frequency conversion system by inserting an additonal signal to both systems. The additional signal is recorded together with the video signal and a phase difference is detected. The detected phase difference is utilized for regulating the phase difference in the respective frequency systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.