Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1981-03-26
1983-06-14
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
328 55, 328155, 328160, 329126, 329145, 375 80, 375 88, 375 94, H03D 306, H03K 900, H04L 2714
Patent
active
043885950
ABSTRACT:
A class of product demodulators operates by multiplying an input signal with a delayed version of itself. Bias distortion in such product demodulators arises when the signals to be multiplied together are not separated by the correct amount of delay. The amount of delay may be adjusted by additively combining a portion of the incoming signal with the delayed signal. In one embodiment an analog implementation is disclosed having a linear multiplier, adder, and delay line. In another embodiment a digital signal processor is utilized to perform product demodulation in accordance with the invention when periodic samples of the incoming waveform are the available signal.
REFERENCES:
patent: 3387220 (1968-06-01), Lender
patent: 3764927 (1973-10-01), Allinger et al.
patent: 3778727 (1973-12-01), Williams
patent: 4048572 (1977-09-01), Dogliotti et al.
patent: 4054840 (1977-10-01), Sato
Oppenheim, "Applications of Digital Signal Processing", Prentice-Hall, Inc., 1978, pp. 1-17.
Bell Telephone Laboratories Incorporated
Grimm Siegfried H.
Morra M. A.
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