Apparatus and method for high-speed video tape duplication from master disk
US5260800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | May 8, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser video disk master is operated at 2.times. speed for duplicating video information to be recorded in VHS format. Two last disk video players are modified to operate in synchronism in order to multiplex from one to the other in duplicating video programs of length equal to the two recorded disks. The 2.times. frequency NTSC format video output signal is then demodulated, drop out detection is performed, and the digitally-encoded stereo audio information is separated, error corrected, and converted by digital to analog (D/A) conversion to left and right channels of stereo analog information. The left and right channels of audio information are presented simultaneously to an FM modulator for presentation to rotating video heads and to a 2.times. Dolby processor for presentation to linear heads. The demodulated 2.times. video information is converted to digital information by an analog to digital (A/D) converter and then time-base corrected and drop out compensated. New sync and blanking signals in digital form are switched into the digitized video signal, and digital color-under chroma processing and digital luminance noise reduction processing are performed. The 2.times. compo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.