Digital/analog compatible video tape recorder
US5978546A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1996 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Jan 11, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8042
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A VTR compatible with the current analog VTR and capable of recording and reproducing digital signals identifies the type of a tape cassette by the presence or absence of a cassette identification hole formed in a digital recording tape cassette determines tape speed for a recording mode on the basis of the ratio between the frequency of a control signal and the rotating speed of a capstan motor, determines the presence or absence of recorded digital signals through the synchronous detection of reproduced output, and decides the mode for recording and reproducing on the basis of those decisions. Thus, the automatic discrimination between the analog mode and the digital mode can be achieved and erroneous operations, such as an erroneous erasing operation can be prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.