Compatible AM-FM frequency discriminator

Details Compatible AM-FM frequency discriminator Compatible AM-FM frequency discriminator

1977-12-05

1979-07-10

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325317, 325349, 325423, 329103, 329135, 329137, 329138, H03D 500

Patent

active

041609557

ABSTRACT:
A compatible AM-FM frequency discriminator for deriving an FM demodulated output and AFC outputs for FM and AM waves from an FM demodulator employing a quadrature detecting circuit which has connected thereto a phase shifter group composed of a series circuit of resonant circuits for AM and FM input frequencies, respectively, and a parallel circuit of AM and FM 90.degree. phase shift circuits exhibiting substantially equal impedance values in predetermined frequency ranges, respectively.

REFERENCES:
patent: 3667060 (1972-05-01), Avins
patent: 3800226 (1974-03-01), Close
patent: 3999138 (1976-12-01), Peil et al.

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