Video tape recorder capable of recording both narrow band and wideband signals
US4963991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Jan 25, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/7925
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a video tape recorder capable of recording and reproducing signals with largely different frequency bands such as narrow band signals including NTSC signal and wide band signals represented by high definition television signal. In a time axis expansion circuit, wide band signals are expanded of their time axis and divided into plural channels, and the band frequencies of these channels are lowered, and at the same time, the widths of plural heads are set narrower than the head width used when recording and reproducing the existing narrow band signals, thereby realizing the recording and reproduction of narrow band signals and wide band signals at identical rotating speed of the cylinder and at identical rotating speed of the capstan. Or, the rotating speed of the cylinder is increased when recording and reproducing wide band signals and the head width used for recording and reproducing wide band signals is set narrower than the head width used when recording and reproducing the existing wide band signals, thereby realizing the recording and reproduction of narrow band signals and wide band signals at identical rotating speed of the capstan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.