Demodulator for the demodulation of a frequency-modulated signal
US5808510A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1996 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Aug 29, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Radio receivers for frequency-modulated signals and more particularly, in such receivers, to a device for the demodulation of a signal modulated at intermediate frequency f.sub.i. The signal F.sub.M that is frequency modulated around a frequency f.sub.i is applied, after conversion into a square-wave signal F.sub.MR, to a delay line with shift registers that is controlled by the signals provided by an oscillator. Each of the three cascade-connected sections of the delay line introduces a delay 1/4f.sub.i and the output signals of each section are applied to EXCLUSIVE OR circuits that respectively give a demodulated signal F.sub.R1, a signal F.sub.R2 for the suppression of a demodulated signal and a signal F.sub.R3 to control the frequency of the oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.