System for demodulating angle-modulated signals

Details System for demodulating angle-modulated signals System for demodulating angle-modulated signals

1976-08-09

1978-01-03

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325349, 329136, 329137, H03D 322

Patent

active

040669726

ABSTRACT:
The inventive system demodulates angle-modulated signals. A tracking band-pass filter responds to an input angle-modulated wave signal. The tracking filter has a pass band with a center frequency controlled by a control signal. A first amplitude limiter limits the amplitude of the input angle-modulated wave signal. A differentiation circuit establishes a 90.degree. phase difference between a signal passing through the tracking band-pass filter and a signal passing through the amplitude limiter. A phase comparator responds to an input with the two signals with a 90.degree. phase difference therebetween and produces an output error signal in accordance with this phase difference. This output error signal is supplied as the control signal to the tracking band-pass filter. This output error signal is also passed through a low pass filter to obtain the demodulated signal.

REFERENCES:
patent: 2835802 (1958-05-01), Day
patent: 3387220 (1968-06-01), Lender
patent: 3392337 (1968-07-01), Neuburger
patent: 3569845 (1971-03-01), Steinberg
patent: 3792357 (1974-02-01), Hekimian et al.

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