produced by, operating by, or involved in heterodyning two signals
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a low-power tube-type or semiconductor generator of electrical oscillations used for frequency conversion in superheterodyne radio receivers, wavemeters, and other devices. The heterodyne generates oscillations of the subcarrier frequency, which are mixed with incoming high-frequency oscillations, resulting in the formation of a constant difference frequency (intermediate frequency). The heterodyne must possess a high stability of frequency and insignificant harmonic oscillation amplitudes. A frequency-tunable laser may serve as the heterodyne in optical-frequency receivers.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
To mix two alternating-current signals of different frequencies in a nonlinear device for the purpose of producing two new frequencies, the sum of and difference between the two original frequencies.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The mixing of two electrical or acoustic signals to produce a third equal to either the sum of or the difference between their frequencies. For example, if a signal with a frequency of 1000 Hz were to be mixed with another signal of 600 Hz, besides the original two frequencies two new frequencies will be produced: 1600 Hz (1000 + 600), and 400 Hz (1000—600). Radar receivers are of the heterodyne type (as contrasted to the superregenerative type) because the very high radio frequencies used in radar are difficult to amplify. A target signal is heterodyned with a current of lower frequency produced by a klystron oscillator and the resulting intermediate-frequency signal can then be highly amplified for subsequent presentation or analysis.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
heterodyningUsing an electronic circuit to combine an input radio frequency with one that is generated in order to produce new frequencies: one that is the sum of the two and another that is the difference of the two. Heterodyning is typically used to bandshift incoming frequencies into intermediate frequencies for demodulation. For heterodyning examples, see superheterodyne receiver.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.