Multilevel data transmission system
US3947767A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1974 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Sep 25, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4919
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improved multilevel code transmission system for transmission of a data signal in the form of an N-level code signal based on a partial response shaping employs a special differential coding prior to partial response shaping on the transmitter side and, on the receiver side subsequent to partial response decoding, a differential decoding corresponding to the differential coding. The system is characterized in that each pair of input, parallel binary codes is so arranged that only the most significant bit is different from each other and the remaining bits are represented by the same binary codes, and in that only the most significant bit is affected by the differential coding and decoding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.