Video signal recording/reproducing system for increasing recording density of a frequency modulated signal
US5315402A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1992 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Aug 25, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal recording/reproducing device has at least a frequency modulating unit which FM modulates information to be recorded on an optical disk memory, a laser driving pulse generating unit for generating a laser driving pulse derived from the frequency-modulated signal generated by the frequency modulating unit and for modifying the duty factor of the laser driving pulse in accordance with the linear velocity of the optical disk memory where recording is taking place; and a recording unit for controlling the laser power during recording to an optimum value in accordance with the linear velocity of the optical disk memory where recording is taking place. This arrangement enables reduction of the minimal length of recording bits resulting in reproduced signals of a level sufficient for obtaining reproduced images of a fine quality addition enables increase of the recording capacity of the optical disk memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.