Digital fm demodulator

H - Electricity – 03 – D

Patent

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H03D 3/00 (2006.01)

Patent

CA 2196819

In a preferred embodiment, an FM demodulator includes an I and Q sampler for generating data samples of I and Q signals of an FM signal. A signalprocessor derives samples of a modulating waveform of the FM signal from the I and Q data samples, using a Lagrangian interpolation function of the I and Q data samples. Variables include derivatives of the I and Q signals obtained by differentiation of the Lagrangian function. Preferably, the processor further utilizes a correction factor to correct the modulating waveform samples obtained from theLagrangian-based interpolation, to thereby derive a modulating waveform exhibiting low signal distortion.

Dans une version préférée, un démodulateur FM comprend un échantillonneur I et Q pour la production d'échantillons de données de signaux I et Q d'un signal FM. En appliquant à ces échantillons une fonction d'interpolation de Lagrange, un processeur de signaux en dérive des échantillons d'une forme d'onde modulante d'un signal FM. Les variables comprennent des dérivées des signaux I et Q obtenues par différenciation de la fonction de Lagrange. De préférence, le processeur utilise en outre un facteur de correction pour corriger les échantillons de la forme d'onde modulante obtenues au moyen de la fonction d'interpolation de Lagrange afin de dériver ainsi une forme d'onde modulante présentant une faible distorsion de signal.

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