Angle modulated wave demodulation system

Details Angle modulated wave demodulation system Angle modulated wave demodulation system

1973-10-04

1976-01-20

Urynowicz, Jr., Stanley M.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

179 15BT, 1791001TD, 329103, G11B 304

Patent

active

039340872

ABSTRACT:
A system for demodulating angle modulated waves comprises a phase locked loop including a phase comparator and a voltage controlled oscillator. An attenuation means is inserted into the phase locked loop. This attenuation means does not affect the DC component of an input angle modulated wave, but does cause an attenuation with respect to an AC component, to cause a decrease in the loop gain. The phase locked loop has a DC lock range exhibiting a relatively wide lock range width even when the input level is relatively low and an AC lock range produced by the attenuation circuit and exhibiting a relatively narrow lock range width when the input level is relatively low. The attenuation means detects an abnormality in the angle modulated wave, the harmonics component of the direct wave, and the like. A variable attenuation circuit controlled by the output of the detecting means is varied in its attenuation quantity.

REFERENCES:
patent: 2378819 (1945-06-01), Albright
patent: 3111625 (1963-11-01), Crafts
patent: 3209271 (1965-09-01), Smith
patent: 3363194 (1968-01-01), Hileman
patent: 3371281 (1968-02-01), Powell
patent: 3564434 (1971-02-01), Camenzind et al.
patent: 3594651 (1971-07-01), Wolejsza, Jr.
patent: 3621399 (1971-11-01), Rabow et al.
patent: 3678397 (1972-07-01), Dann
patent: 3686471 (1972-08-01), Takahashi

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