Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1977-04-06
1978-11-28
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
307233R, 325349, 325487, 329136, 329137, 358 23, H03D 306, H04N 950
Patent
active
041278259
ABSTRACT:
A quadrature phase detector having a tuned circuit connected between inputs thereof with a voltage variable reactance connected therein and further connected to the output of the phase detector for tuning the tuned circuit in accordance with the output of the phase detector, and a voltage variable capacitor in the tuned circuit connected to receive a signal from a comparator which compares the output of the phase detector to a reference signal so that a signal having a predetermined frequency can be applied to the input of the phase detector and the tuned circuit of the phase detector is tuned to a predetermined reference frequency. The tuned circuit input of the phase detector continually tracks the input signal, which may be a FM color subcarrier signal. Additionally, there is compensation for the inherent nonlinearity in the tuned circuit.
REFERENCES:
patent: 2976408 (1961-03-01), Colaguori
patent: 3084291 (1963-04-01), Verstraelen et al.
patent: 3092780 (1963-06-01), Fisher
patent: 3436647 (1969-04-01), Gobeli et al.
patent: 3593167 (1971-07-01), Koulopoulos
patent: 3609408 (1971-09-01), Motisher et al.
patent: 3701030 (1972-10-01), Gocho et al.
patent: 3832656 (1974-08-01), Ito et al.
Grimm Siegfried H.
Jones, Jr. Maurice J.
Motorola Inc.
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