Digital FM demodulator using a lagrangian interpolation function

Details Digital FM demodulator using a lagrangian interpolation function Digital FM demodulator using a lagrangian interpolation function

1996-04-04

1997-12-02

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

329341, 375324, 455214, H03D 300

Patent

active

056940793

ABSTRACT:
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 signal processor 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.

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patent: 4910469 (1990-03-01), Takahashi
patent: 5052050 (1991-09-01), Collier et al.
patent: 5220583 (1993-06-01), Solomon
patent: 5404589 (1995-04-01), Bijker et al.

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