FM-Demodulator with ladder filter delay line and multiplier

Details FM-Demodulator with ladder filter delay line and multiplier FM-Demodulator with ladder filter delay line and multiplier

1982-07-12

1985-08-13

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329137, 329143, 329145, 333138, 455214, 455337, H03D 302, H03K 906

Patent

active

045352968

ABSTRACT:
For demodulating an FM-carrier which is, for example, modulated by a video signal and two sound subcarriers, a Gilbert mulitplier (13) and a phase shifting circuit (12) are used. The phase shifting circuit is formed by elements of a Gaussian type bandpass-ladder filter consisting of at least three sections each representing one pole. The output (10) of the phase shifting circuit is taken from the output of a filter section prior to the last filter section.

REFERENCES:
patent: 2229640 (1941-01-01), Crosby
patent: 2461321 (1949-02-01), Guillemin
patent: 4054840 (1977-10-01), Sato
patent: 4431970 (1984-02-01), Sumi et al.
Zverev, Handbook of Filter Synthesis, Wiley & Sons, 1967, pp. 93-97.

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