Transmission system of frequency division multiplex signals on digital links
US4313194A · kind A · utility
Inventors
Key dates
| Filing date | Dec 27, 1979 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Dec 27, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J4/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Transmission system of frequency division multiplex signals on a digital link. At the transmitting end of the digital line, the frequency division multiplex signals are sampled and coded into n-bit sample words. These sample words are transcoded into p-bit on-line words with p smaller than n through a transcoding procedure which makes a plurality k of successive levels of the n-bit code correspond to one and the same level of the p-bit code. The number k is selected depending on the maximal level reached by a sample word in a block of successive sample words. The number k is transmitted to the receiving end of the digital link by a control word for reverse transcoding of the on-line p-bit words into reconstituted n-bit sample words.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.