Demodulation circuit from FM signals and demodulation system the

Details Demodulation circuit from FM signals and demodulation system the Demodulation circuit from FM signals and demodulation system the

1984-07-18

1986-06-10

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329136, 329169, 328155, 307510, H03D 300

Patent

active

045945560

ABSTRACT:
A demodulation circuit for frequency modulated signals according to this invention comprises a variable phase shifter supplied with inputted FM signals, a narrow band pass filter having a band width narrower than that of the Curson band for the FM signals, a frequency discriminator, a filter allowing specific frequency components among the FM detected signals detected by the frequency discriminator to pass, and a phase adjuster to said frequency components, wherein said inputted FM signals are passed through said variable phase shifter said narrow band pass filter and then FM detected by said frequency discriminator, a portion of the detected output signals is passed through said filter allowing to pass the specific frequency components and the phase adjuster, thereafter, the phase shifter is controlled by said signals, the phase of the FM signals is controlled by the phase shifter in the direction of compressing the frequency deviation for said specific demodulated frequency components in the FM signals, and detected signals from said frequency discriminator are taken out.

REFERENCES:
patent: 3851263 (1974-11-01), Fukushima et al.
patent: 4309649 (1982-01-01), Naito

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