Compensation circuit for multi-path propagation distortion in bi

Details Compensation circuit for multi-path propagation distortion in bi Compensation circuit for multi-path propagation distortion in bi

1978-03-15

1979-04-24

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325320, 325347, 325349, 325474, 325482, 329132, 329136, 329147, H04L 2714

Patent

active

041514750

ABSTRACT:
A receiving system for digital communication signals modulated on a carrier in the form of binary frequency modulation in a propagation medium which is affected by reflections in which the information losses occurring as a result of phase and amplitude distortions are automatically determined by two mutually supplemental arrangements. One of these arrangements includes in a first branch a frequency discriminator after which is connected a device for recognizing interference peaks caused by reflection distortions and further including a circuit which compensates for these interference peaks. The other arrangement contains an amplitude demodulator which is connected in parallel to the frequency demodulator in a second branch. The outputs of both branches are supplied to a switch which is controlled by an amplitude modulation evaluation device which at a recognizable amplitude modulation of sufficient magnitude connects the second branch to a common output, and at a recognizable frequency modulation connects the first branch to this output.

REFERENCES:
patent: 3168699 (1965-02-01), Sunstein et al.
patent: 3293551 (1966-12-01), Ehrich
patent: 3348153 (1967-10-01), Featherston
patent: 3351859 (1967-11-01), Groth, Jr. et al.
patent: 3383600 (1968-05-01), Calfee
patent: 3537008 (1970-10-01), Lakatos

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