Data transmission systems
US4071692A · kind A · utility
37Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1976 |
| Grant date | Jan 31, 1978 |
| Priority date | — |
| Expiry date | Oct 8, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4923
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Intelligence is conveyed in a PCM bit stream form with alternate bits being inverted. Additional information is conveyed by violations of the alternate bit rule so that two successive bits have the same polarity. Prior to being coupled to the alternate mark inversion coder a pseudo-random bit stream is mixed by binary addition without carry to the intelligence bit stream to maintain low DC level in the transmitted mixed bit stream and to maintain bit transitions relatively high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.