Method for demodulating an FM signal

Details Method for demodulating an FM signal Method for demodulating an FM signal

1988-10-07

1989-08-22

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

455214, H03D 300

Patent

active

048599573

ABSTRACT:
A method for demodulating an FM signal (FM=Frequency Modulation), in which the FM signal is directly mixed down into an in-phase and a quadrature component of a complex frequency baseband and a modulation signal is determined from a phase relationship of the complex frequency baseband signal, and the phase relationship is determined from a curve length of the frequency baseband signal. The curve length is approximated by a length of a polygon curve which is spanned by successive sampled values of the complex frequency baseband signal. An estimated radius of an envelope curve of the complex frequency baseband is preferably used for normalizing the curve length. A signal receiver according to the invention comprises a direct converter (2), AC-coupled amplifiers (5a, 5b), a demodulator (6a) and a loudspeaker (8).

REFERENCES:
patent: 4567442 (1986-01-01), Haussmann
patent: 4583239 (1986-04-01), Vance
Marshall, "A Radio-Paging Receiver Architecture and Demodulator", Philips Journal of Reserach, vol. 41, Supp. No. 2, 1986, Introduction pp. 1-6; Appendix A, pp. 113-118.

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