Video signal processing apparatus for prompter
US5715019A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1997 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Mar 4, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/2222
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal processing apparatus for a prompter of the present invention is capable of projecting a picture easy to see without a flicker of an image in the vertical direction during a vertical scrolling operation. An image data of a manuscript is displayed by interlace scanning, and the displayed manuscript is vertically scrolled at various speeds. The control circuit of the apparatus updates the uppermost horizontal line read from the image memory by one every time even field is read if the scrolling speed is 8 sec./screen. The control circuit updates the uppermost horizontal line read from the image memory when one of three consecutive even fields except a predetermined one is read if the scrolling speed is 12 sec./screen. In this manner, the uppermost horizontal line is sequentially replaced in order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.