Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1980-01-07
1981-11-10
Olms, Douglas W.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329146, 332 41, H04H 500
Patent
active
043000193
ABSTRACT:
A multiplier circuitry which multiplies an electrical signal by a multiplier signal comprises an oscillator which oscillates at a frequency having a predetermined relationship with respect to the multiplier signal, a first signal generator for producing an asymmetrical square wave signal in response to the output signal of the oscillator, a frequency divider for dividing the frequency of the asymmetrical square wave signal from the first signal generator by two to produce at least one asymmetrical square wave signal, and a second signal generator for multiplying an input electrical signal by the asymmetrical square wave signal and subsequently by a symmetrical square wave which is obtained from the asymmetrical square wave signal. The methods and apparatus for multiplying an electrical signal according to the present invention may be adapted to a phase comparator, modulator, demodulator and the like.
REFERENCES:
patent: 3155824 (1964-11-01), Rotier
patent: 3980832 (1976-09-01), Nakamura et al.
patent: 4061882 (1977-12-01), Dorren
Olms Douglas W.
Victor Company of Japan , Limited
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