Video tape recorder system having means for suppressing video track crossover noise during slow and fast motion operation
USRE31078E · kind E · reissue
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1979 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Apr 13, 1999 |
Classification
- Technology area (CPC —)General
Abstract
A helical scan video tape recorder suitable for slow and fast motion modes of operation is disclosed. A plurality of video fields are recorded in each video track extending across the video tape such that the burst of noise produced when the magnetic head crosses over the guard band between separate video tracks during the slow or fast mode of operation of the video recorder is encountered in only one of the field regions in the video track. This burst of noise is utilized to control the television monitor circuit so that the video field region which is free of noise is reproduced on the monitor while the video field region which contains the noise is blanked out from the monitor. As the noise progresses from one field region to the succeeding field region in the video track, means is provided for automatically switching to display of the noise-free field region. Means is provided for at times controlling the brightness of the monitor to compensate for those instances at switchover where two fields are reproduced in succession without the intervening blank period. A ramp generator circuit is provided for compensating for the change in timing of the vertical sync pulses during the s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.