Data randomizing/de-randomizing circuit for randomizing and de-randomizing data
US4978955A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Nov 9, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03866
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A circuit for randomizing data or de-randomzing previously randomized data according to a randomization scheme utilizing an irreducible generator polynomial which operates on a serial bit stream of words of data which is supplied to said circuit in a format, either LSB or MSB first, different from the format according to which the data was previously randomized or will be subsequently de-randomized. The circuit includes means for generating said irreducible generator polynomial; means for triggering said generating means in a given direction in response to a clock signal; means for exclusively ORing the contents of a bit in said generating means with a bit in said bit stream; and means for periodically interrupting said triggering means and instead setting the state of said generating means a predetermined number of states in a direction effectively the opposite to which said generating means normally generates data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.