Image signal processing circuit for producing multiple pictures on a common display screen
US5016106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | May 31, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/45
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an image processing circuit for displaying a plurality of sub-pictures which have different image signal sources on a common screen. The inventive subject digitalizes an original image analog signal by use of a corresponding sampled signal upon a multiple picture processing, saves the digitalized data almost simultaneously, and uses a dual-port memory for reading the data, whereby the circuit simplifies the generating process of a control timing signal and renders the PIP process easy to carry out, when controlling the dual-port memory by read-write operation. The apparatus for carrying out the invention includes a keyboard or remocon for data input/output, a microcomputer for controlling the entire process, a controller for controlling display processes, an analog switching device, an A/D converter for converting the analog signal to a digital signal, a dual-port memory for dealing with various image signals, and three D/A converters for converting digital data to analog data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.