Asynchronous ZCD demodulator/decoder
US7558339B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 23, 2005 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Jul 10, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/1563
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
There is provided a detector for extracting binary data frequency-modulated on a carrier signal. An axes generator produces M pairs of logic signals, the logic signals of the same pair being in quadrature. The decoder includes M asynchronous logic zero-crossing detectors producing first pulses and second pulses. An up-counter/down-counter has first, second and third values, and when it has the second value, passing to the first value during a first pulse, and passing to the third value during a second pulse, and a binary decoder generates binary data whose state is not modified when the up-counter/down-counter passes from the first value to the second value or from the third value to the second value. No external time base is required and the decoder has a reduced bit error ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.