Digital video signal coding circuit, digital signal decoding circuit
US5585855A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1994 |
| Grant date | Dec 17, 1996 |
| Priority date | — |
| Expiry date | Jun 23, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/783
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital video signal coding circuit has a first DCT circuit for DCT converting a digital video signal with respect to frame and second DCT circuit for DCT converting the digital video signal with respect to fields which is used to reduce high frequency component of image. These outputs are selected according to high frequency components. The selected signal is separated to two signals respectively coded with data compression through VLC circuits which are provided to speed up the processing speed with non-industrial use ICs. A helical scan video tape recorder records the digital video signal such that at a lower portion (width direction) of slant track on a video tape, video data of an upper screen portion of the first field is recorded, at an upper portion of the track, video data of the upper screen portion of the second field is recorded, at a lower portion of the next slant track, video data of a lower screen portion of the first field is recorded, and at an upper portion, video data of the lower screen portion of the second field is recorded. This provides favorable image on a searching mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.