Signal demodulation system for wideband FM

Details Signal demodulation system for wideband FM Signal demodulation system for wideband FM

1983-05-16

1985-10-15

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329192, 455214, H03D 300

Patent

active

045477396

ABSTRACT:
A frequency demodulation system for wideband FM is responsive to an incoming wideband frequency modulated signal to derive therefrom a demodulated output signal. The system includes a delay line having an input to which the incoming signal is applied and having an output at which a delayed incoming signal appears. The system also includes a differential amplifier having a first input to which the incoming signal is applied and a second input coupled to the delay line to receive the delayed signal. The amplifier performs direct vector addition of the incoming signal and delayed signal to produce at the output of the amplifier an amplitude modulated and frequency modulated signal which is the direct vector sum of the incoming signal and the delayed signal as amplified. The system also includes an envelope detector coupled at its input to the output of the amplifier and responsive to the amplifier output signal to produce at the detector output the demodulated signal.

REFERENCES:
patent: 3100875 (1963-08-01), Peterson
patent: 3404346 (1968-10-01), Hall et al.
patent: 3480869 (1969-11-01), Hubbard
patent: 3881157 (1975-04-01), McLaughlin
patent: 4054840 (1977-10-01), Sato
patent: 4119919 (1978-10-01), Sugawara
patent: 4245559 (1981-01-01), Wakeman et al.

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