Method of and means for providing information to edit a video tape
US5018027A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1989 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | May 10, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of and apparatus for editing half-inch tape used for home recording of video material applies pulse-width modulation to prerecorded synchronizing pulses in predetermined time intervals. The interval is started with an eleven-bit header that is compatible with that of a commercially available system known as the VASS system. Time blocks are then encoded by pulse-width modulation with information identifying the particular recording session and the number of elapsed seconds minutes and hours since the beginning of the session. A check code completes the modulation during the interval for television systems such as and SECAM that are adapted for fifty-Hz operation. For systems such as NTSC that operate at sixty Hertz, a ten-bit dummy code is added to complete the two-second interval. The code is entered without writing over the leading edge of the prerecorded synchronizing pulse, allowing the timing of those pulses to continue without interruption. Using this system, an editor can locate any desired interval and can then locate an individual frame within that interval by counting synchronizing pulses. The apparatus of the invention inserts and detects the header, inserts and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.