Method for scrambling and/or descrambling FM subcarrier data
US5912973A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1996 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Mar 29, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0662
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An FM multiple radio broadcasting receiver includes a data group number and data packet number derivation circuit by which a data group number and a data packet number included in a prefix of FM subcarrier data are derived. A first random number generator generates a first random number on the basis of the data group number, the data packet number and scramble key data which is outputted from a scramble key generation circuit, and sets the first random number in a second random number generator as its initial value. Therefore, it is possible to appropriately scramble or descramble with using packet structure of the FM subcarrier data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.