Control arrangements for digital radio receivers
US5663989A · kind A · utility
11Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1994 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | Oct 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/046
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a frequency modulated digital radio transmission system, frequency differences between transmitter and receiver which give rise to DC offsets at the output of the demodulator are countered for any one data transmission by establishing a frequency controlling or DC level controlling signal during a preamble sequence having a known constant DC component, such as the sequence 10101 - - - used for clock or data synchronization, and retaining that controlling signal substantially unaltered for use during the remainder of that data transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.