heterodyne


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heterodyne

produced by, operating by, or involved in heterodyning two signals

Heterodyne

 

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.

heterodyne

[′hed·ə·rə‚dīn]
(electronics)
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.

heterodyne

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.
References in periodicals archive ?
8]) in the form of two-frequency HeNe lasers are routinely used in heterodyne interferometry to perform precision length, angular, straightness, flatness, and velocity measurements.
It is worth noting that the heterodyne phaser can also be obtained by using a two lasers scheme: the two lasers provide the frequency shifted light signals thus avoiding the use of the OFS.
My training instruction was more hands on used to teach and reinforce the skills necessary to operate and maintain the R-390A/URR general coverage HF receiver that uses super heterodyne principles (for example).
Yngvesson, A passive heterodyne hot electron bolometer imager operating at 850 gigahertz, IEEE Trans.
Heterodyne, on the other hand, could demodulate the signal from high frequency range to low frequency while maintaining the signal integrity.
Scientists used Herschel's Heterodyne Instrument for the Far-Infrared (HIFI) on June 22 to look for warm molecular gas heated by newborn massive stars in the DR21 star-forming region in Cygnus.
It carries three scientific instruments, a very high resolution heterodyne spectrometer, an imaging photometer / medium resolution grating spectrometer and an imaging photometer / imaging Fourier transform spectrometer, designed to take maximum advantage of the characteristics of the Herschel mission.
Bershtein developed a heterodyne method for frequency fluctuation measurement, enabling his disciples Yu.
The Heterodyne Instrument for the Far Infrared (HIFI) operates from 150 to 600 microns.
Traditional heterodyne receivers with one or more intermediate frequency stages offer good channel selectivity and robustness, but they require expensive and bulky off-chip filters resulting in a low degree of integration, high bill-of-material and increased power consumption of on-chip drivers.
And not merely do they wish to preserve these things from the other worldly threat of the heterodyne (the series of monsters/natural phenomena that menace the peace) but, as becomes plain during the course of the series, the characters are putting forward such a liberal vision as a specific rejection of other, darker social visions.