Videofax system with progressive image display
US6788331B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Aug 1, 2000 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Jun 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/8586
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved videofax system for displaying a video image from a digital memory, while the digital memory is being updated with data representing a new image and received from a standard telephone line or other communication channel with relatively slow data access time. A video processor circuit uses a first digital counter to increment the address of a digital memory sequentially and load the stored data to a digital-to-analog converter for display of the resulting analog composite signal on a standard monitor. The video processor uses the address provided by a second digital counter to temporarily switch the digital memory address provided by the first counter and sequentially update the digital memory with new data received from a modem, a microcontroller, or any other data storage components with slow access time, enabling a user to view the new image as it overwrites the old image with a sense of continuity between the old image and the new image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.