Vertical filter circuit for PIP function
US5657093A · kind A · utility
4Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Jun 30, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/45
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A vertical filter circuit providing a PIP function, which can be used for constructing a sub-screen when the input signal of a main screen is a double-scanned signal or a HDTV signal, compresses the vertical lines of the sub-screen into two-thirds of the original image. Preferably, the vertical filter includes an array of logical elements, a one line memory, two switches for signal routing and a control signal generator operating selected ones of the logical elements and the switches responsive to the horizontal and vertical sync signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.