Binary frequency-shift keying demodulator and frequency-to-voltage converter
US6989710B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2004 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Jul 20, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A BFSK demodulator comprises a three-channel frequency-to-voltage converter, an information signal inputting the first-channel frequency-to-voltage converter, a converted information signal inputting the second-channel frequency-to-voltage converter, wherein outputs of first and second channel frequency-to-voltage converter are connected with a capacitor, a output voltage signal produced by the first and second frequency-to-voltage converters and the capacitor, inputting into a positive terminal of the comparator after high frequency noise filtering through a first low-pass filter, a carrier signal inputs into the third-channel frequency-to-voltage converter; and an output from the third-channel frequency-to-voltage converter connected to a capacitor; and a reference voltage signal is produced after high frequency noise filtering through a second low-pass filter, producing a demodulated signal after comparing the information voltage signal with the reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.