Computer-monitor extended range communications link
US5268676A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1990 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Mar 5, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A communications link up to about 300 feet for use between a computer and display unit receives analog R, G, and B signals from the computer and applies them to discrete current amplifiers that modulate signal current applied to discrete conductors of a 300 foot cable. Impedance matching networks match the R, G, and B signals to the characteristic impedance to the cable. The R, G, and B signals are received near the monitor, and coupled to discrete emitter-follower transistors, which amplify current of the signals prior to inputting the signals to the monitor. The horizontal sync signal is applied to a conductor of the cable without impedance matching, allowing the conductor to attenuate the horizontal sync signal and reduce noise radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.