Method and apparatus for controlling the spectral content of a data stream
US5216714A · kind A · utility
10Cited by
2References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1991 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Dec 13, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03872
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An FDDI transmitting apparatus employs a scrambler to scramble input NRZ data which in turn is input to an NRZI-to-NRZ pre-encoder. This is in turn coupled in series with an NRZ-to-NRZI encoder to produce scrambled FDDI data for transmission whose spectral content is predistorted to minimize spectral content peaks above about 30 MHz. A complementary receiving apparatus employs an NRZI-to-NRZ decoder which, according to the invention, is coupled to an NRZ-to-NRZI postdecoder. This data is thence coupled to a descrambler according to the invention to recover the original data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.