Circuit for demodulating FSK signals
US5483193A · kind A · utility
108Cited by
24References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1995 |
| Grant date | Jan 9, 1996 |
| Priority date | — |
| Expiry date | Mar 24, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/1566
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A circuit and method of demodulating an FSK signal uses digital circuitry to convert the received signal into count values. For each reception an adaptive reference count value is determined by averaging the duration of received pulses during the preamble of the transmission. The adaptive reference count corresponds to a demodulated logic "1" or logic level "0". The counts from the coded portion of the transmission are compared to the adaptive reference count. If the count is within predetermined windows from the reference count, the count value is converted to the corresponding digital signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.