Multiplex magnetic recording and reproduction system
US4591924A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Jan 31, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/4673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a video tape recorder of the helical scan type, a pair of rotary magnetic heads for the audio signal are provided in addition to the rotary video heads so that the audio signal is recorded on the same slant track as of the video signal on a multiplex basis. The audio head pair is provided with an azimuth angle with opposite polarities from each other and different in value from that of the video head pair. The system has a first operation mode of the standard tape speed and a second operation mode in which the tape is fed at a speed, for example, 1/3 the standard tape speed. The audio and video head pairs are disposed on lines intersecting at right angles with an offset of T.sub.1 /2+T.sub.1 provided in the axial direction of rotation between the two magnetic head pairs, where T.sub.1 is the track pitch of the recording track formed on the tape in the second operation mode. The system produces overlapping tracks for the audio and video signals on the magnetic tape. In the first operation mode, the recording track is formed by a combination of magnetic heads providing an increased difference of azimuth angles between the audio and video heads, while in the second operation mode, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.