Art processor in a picture-in-picture system
US4975774A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Aug 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/45
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An art processor in a picture-in-picture system which performs a given art processing to a subscreen when subscreen the same image source as a main screen. One embodiment to carry out the objects of the invention includes a first synchronous signal detector and a second synchronous signal detector which detect synchronous signals from image sources received, an exclusive OR gate for comparing a first synchronous signal and a second synchronous signal, an integrator for integrating said synchronous signals, a monostable multivibrator for producing a pulse signal having a given width, a DC generator for changing said pulse signal to a smooth DC signal, a driving signal generator for producing a driving signal by use of said DC signal, a switching stage for switching a plurality of input lines of PIP signal according to said driving signal, and a D/A converter for generating a given art signal for the subscreen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.