Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1987-12-18
1989-05-23
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329169, 455245, H03D 106
Patent
active
048334170
ABSTRACT:
A synchronous demodulation system with digital signal output contains a summation circuit receiving an input signal to be demodulated and a control signal. The output of the summation circuit is applied to a synchronous demodulator which feeds into a controller. The controller comprises an integrator, which precedes an A/D converter and a processor that acquires the output pulses of the A/D converter. The processor drives a D/A converter supplying the control signal to the summation circuit so that the summation of the input signal and the output of the D/A converter, averaged over time, leads to an (approximately) zero signal in the synchronous demodulator. Due to digital control the circuit is distinguished by a large dynamic range and high accuracy with simultaneous insensitivity.
REFERENCES:
patent: 3265980 (1966-08-01), Thompson
patent: 4456376 (1984-06-01), Carrington et al.
Article: "Direct Rotation-Rate Detection with a Fibre-Optic Gyro by Using Digital Data Processing", Electronic Letters, vol. 19, No. 23, Nov. 1983, pp. 997-999.
"Demodulation Circuit", Patent Abstracts of Japan, vol. 6, No. 72, May 1982 (Japanese Pat. No. 57-10506, 1-20-1982, Yoshida).
Grimm Siegfried H.
Kramsky Elliott N.
Litef GmbH
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