Angle modulated wave demodulation system

Details Angle modulated wave demodulation system Angle modulated wave demodulation system

1974-09-03

1976-09-28

Konick, Bernard

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

1791004ST, 1791001TD, 179 1GQ, G11B 304, G11B 374, H03D 300

Patent

active

039835006

ABSTRACT:
An angle modulated wave demodulation system demodulates an input angle modulated wave by means of a phase locked loop system which comprises a phase comparator, which is operated responsive to an input angle modulated wave. A voltage controlled oscillator is supplied with a part of the output of the phase comparator which controls its oscillation frequency. The oscillator supplies its oscillation frequency to the phase comparator. The phase locked loop system has a lock frequency range which decreases its width when the level of the input angle modulated wave is below a predetermined level. The portion of this lock range in which the width of the lock range decreases is positively utilized. The voltage controlled oscillator oscillates at a frequency equal to the center frequency of the carrier of the input angle modulated wave, when the phase locked loop becomes unlocked.

REFERENCES:
patent: 3209271 (1965-09-01), Smith
patent: 3371281 (1968-02-01), Powell
patent: 3654564 (1972-04-01), Tisi
patent: 3686471 (1972-08-01), Takahashi
"Frequency-Selective Integrated Circuits Using Phase-Lock Techniques," by Grebene and Lamenzind, IEEE Journal of Solid State Circuits, Aug. 1969, pp. 216-225.
Pulse, Digital and Switching Wave Forms, by Millman and Taub, p. 193, 1965.
Circuits, Devices and Systems, by R. Smith, p. 143, 1966.

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