Back to results
US 5,952,879 AGranted
Device for the simultaneous demodulation of a multifrequency signal, particularly for an eddy current measurement
AssigneeIntercontrole
InventorEdouard de Ledinghen
Life of this patent
Estimating the term…
Abstract
A device for the simultaneous demodulation of a multifrequency signal comprising a processor in which demodulation takes place by calculation. An injector's output signal is multiplied by a complex signal having sinusoids of varying frequencies corresponding to frequency-shifted carriers, thereby transposing the injector's signal on intermediate frequencies.
Claims3
Device for the simultaneous demodulation of a multifrequency signal, comprising a processor, where the demodulation takes place by calculation, comprising an injector, whose output signal is multiplied by a complex signal in the following form:
- ##EQU3## .epsilon..sub.1 being a small frequency deviation and .alpha..sub.1 a phase, the frequencies of the N sinusoids being the frequencies of the frequency-shifted carriers, so as to transpose the signal of the injection on the intermediate frequencies.
Dependencies are inferred from the claim text.