Servo for VTR drum motor with external reference signal phase modulation
US4802032A · kind A · utility
9Cited by
10References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Jun 23, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/4733
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A servo circuit is provided for use with a reproducing apparatus wherein an information signal is reproduced from an elongated slant track formed on a tape which is wrapped on the periphery of a guide drum having a rotary head. The servo circuit includes a circuit for detecting an intermediate point of the length of the slant track and generating a timing signal at the detection of the intermediate point and a circuit for comparing the timing signal with a reference pulse to generate a control signal. A relative position of the slant track to the rotary head is controlled in accordance with the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.