Sampling modulated waves

Details Sampling modulated waves Sampling modulated waves

1978-11-30

1979-12-11

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, H04B 116

Patent

active

041785533

ABSTRACT:
The method of transmission of a carrier double-sideband amplitude-modulated by a message, comprising sampling the modulated wave at regular intervals at a sampling rate greater than twice but less than four times the highest message frequency, with the sampling rate an integral sub-multiple of twice the carrier frequency of the modulated wave, the instants of sampling not occurring at instants of zero crossings of the carrier, and subsequent reconstruction of the modulated wave or the message from the sequence of samples in an integrating filter, with substantially complete accuracy.

REFERENCES:
"Reference Data for Radio Engineering", New York, 1969, pp. 21-14 and 21-15.
Black, "Modulation Theory", Princeton, 1953, pp. 37-57.
Panter, "Modulation, Noise, and Spectral Analysis", New York, 1965, pp. 506-547.

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