Digital demodulator using numerical processor to evaluate period

Details Digital demodulator using numerical processor to evaluate period Digital demodulator using numerical processor to evaluate period

1991-11-20

1992-10-27

Grimm, Siegfried H.

Demodulators

Pulse or interrupted continuous wave demodulator

Pulse width demodulator

329321, 329341, 375 80, 375 95, H03D 300

Patent

active

051592819

ABSTRACT:
A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated signal as numerical information. For frequency demodulation, a high gain stage is applied to an incoming FM signal to produce a corresponding sequence of square waves. The period between zero-crossings of the square waves is accurately measured to within one clock pulse using a high-speed clock and at least one counter. Period information is then provided to a numerical processor, wherein it is at least scaled and low-pass filtered to produce a high-quality demodulated signal with a high signal-to-noise ratio.

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Oppenheim, A. V., and Schafer, R. W., Digital Signal Processing, publ. by Prentice-Hall, 1975, pp. 242, 408-409.

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