Apparatus for determining recording mode of frequency-modulated video signal
US5113265A · kind A · utility
5Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1989 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Sep 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/833
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus determines a recording mode of a frequency-modulated video signal read out from a recording medium. The apparatus extracts, from demodulated video signals, pulse signals related to vertical and horizontal synchronization signals. With consideration of a period defined by these pulse signals, the apparatus sets a predetermined period, in which, a signal containing a sync tip frequency component of the frequency-modulated signal is counted to determine the recording mode depending on a resultant count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.