DIGITAL FM DEMODULATOR

In a preferred embodiment, an FM demodulator (10) includes an I and Q sampler (12) for generating data samples of I and Q signals (on 13, 14) of an FM signal (on 15). A signal processor (15) derives samples of a modulating waveform of the FM signal from the I and Q data samples, using a Lagrangian i...

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Bibliographic Details
Main Authors BLAKE, ROY BAXTER, ALLPRESS, STEPHAN ALAN
Format Patent
LanguageEnglish
Published 15.03.2000
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER
ELECTRICITY
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Summary:In a preferred embodiment, an FM demodulator (10) includes an I and Q sampler (12) for generating data samples of I and Q signals (on 13, 14) of an FM signal (on 15). A signal processor (15) 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 the Lagrangian-based interpolation, to thereby derive a modulating waveform exhibiting low signal distortion.
Bibliography:Application Number: KR19970012324