System for high speed serial video signal transmission using DC-balanced coding
US5974464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1996 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Sep 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4342
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A new high-speed digital interface for transmitting video information over various transmission media including terminated copper wires such as twisted-pair wires and fiber optical cable is described. The significance of this new interface is that (1) it only uses a small number of data channels with all timing and control data embedded in data transmission, (2) it uses a transition controlled binary DC balanced coding for reliable, low-power and high-speed data transmission, (3) it uses low-swing differential voltage which minimizes EMI, and (4) it can be implemented in low-cost scaleable CMOS technology as a megacell or standard IC. The high-speed digital interface incorporates a method and apparatus for producing a transition-controlled, DC-balanced sequence of characters from an input sequence of data bytes. The bits in each of the data bytes are selectively complemented in accordance with the number of logical transitions in each data byte in order to produce selectively complemented data blocks. A cumulative disparity is then determined between the logical values of different type included within ones of the selectively complemented data blocks previously encoded into charact…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.