Circuit arrangement for the demodulation of a phase-modulated signal
US3947777A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1974 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Mar 19, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2332
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Apparatus for demodulating phase modulated signals is described. The latter signals are produced by modulation of a carrier or harmonically related carriers. The modulated signal, constituted by consecutive modulation sections, is coupled to an analogue multiplier, the output of which is connected to an integrator. The integrator produces the demodulated signal. A pulse generator produces a sequence of pulses, each of which occurs within a given modulation section. The duration of each pulse equals the reciprocal of the fundamental frequency. A carrier corresponding in frequency and synchronized with the transmitted carrier is produced in the receiver. The transmitted carrier and receiver-produced carrier are coupled to the multiplier. The latter carrier is switched prior to its application to the multiplier using the output of the pulse generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.