Method of multi-speed recording-reproducing a video signal in digital video cassette recorder
US5510899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1993 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Dec 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/783
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of reproducing a video signal in a digital video cassette recorder, comprising the step of performing intra-frame coding at an interval of a predetermined number of frames of the video signal to compress the video signal and recording the compressed video signal on a video tape, and the step of varying a travelling speed of the video tape according to a desired one of normal, still, fast forward, fast reverse, slow forward and slow reverse playback modes to reproduce the video signal recorded on the video tape in the desired playback mode. The travelling speed of the video tape is varied by combining speeds of the normal, still, fast forward jump and fast reverse jump modes according to the desired playback mode. The intra-frame coding is performed at an interval of L frames, where L is a natural number greater than or equal to 2, and first slice data of the coded Lth frame becomes first video data of a transmitted data field. Therefore, editing and speed change modes of the digital video cassette recorder can be performed in the basic unit of the coded Lth frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.