Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1979-05-10
1981-01-20
Moore, David K.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329133, 455305, H03D 300
Patent
active
042465419
ABSTRACT:
A system comprising a demodulator for demodulating an input FM signal which has been subjected to interference by another FM signal, an envelope detector for detecting the envelope of fluctuation of the amplitude of the input signal, an AGC circuit for controlling the level of the input signal supplied to the envelope detector, a capacitor for passing only the AC component of the output of the envelope detector, a first delay circuit for delaying the AC component by a specific delay time, a circuit having a transfer characteristic of a hyperbolic function and converting the waveform of the output of the first delay circuit, an analog multiplier supplied at its x input terminal with the output of the waveform converting circuit and producing a distortion cancellation signal, a second delay circuit for delaying the output demodulated signal of the demodulator by the specific delay time, a first operation circuit supplied with the output signal of the second delay circuit and with the distortion cancellation signal and carrying out an operation such as substantially cancelling the interference distortion of the demodulated signal with the distortion cancellation signal, and a second operation circuit supplied with the output signal of the first operation circuit and the output signal of the demodulator, thereby carrying out a signal combining operation and supplying the resulting output signal to the y input terminal of the analog multiplier. The output of the first operation circuit is a demodulated signal in which the interference distortion has been cancelled and thus removed.
REFERENCES:
patent: 3568078 (1971-05-01), Pelchat
patent: 3611169 (1971-10-01), Hess et al.
patent: 4166251 (1979-08-01), Ishigaki et al.
Moore David K.
Victor Company of Japan , Limited
LandOfFree
System for removing interference distortion in the demodulated s does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for removing interference distortion in the demodulated s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for removing interference distortion in the demodulated s will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1769270