Self calibrating demodulator system

Details Self calibrating demodulator system Self calibrating demodulator system

1999-09-01

2000-12-26

Mis, David

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329345, 329351, 375224, 375316, 455 671, 455295, H03D 106, H04B 1700, H04B 110, H03K 900

Patent

active

061665940

ABSTRACT:
A reference signal source produces a substantially distortion free reference signal which is supplied to a demodulator that is arranged to demodulate the substantially distortion free reference signal. A calibration filter and an equalizer are included downstream of the demodulator. A controller sets the calibration filter to initially pass the reference signal to the equalizer without substantial change to the reference signal. The controller subsequently calibrates the calibration filter in accordance with the demodulator caused distortion reduced by the equalizer.

REFERENCES:
patent: 4972433 (1990-11-01), Yamaguchi et al.
patent: 5481564 (1996-01-01), Kakuishi et al.
"Hewlett-Packard Journal", Dec. 1993, vol. 44, No. 6, pp. 10, 11, 17-19, 31-34 and 53-57.

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