heterodyne


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Related to heterodyne: heterodyne receiver, Heterodyne principle

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.
In the year 2018 an unknown type of monster called a heterodyne appeared off Japan's coast, wandered into the Tokyo area and was ultimately destroyed only by the use of a weapon of mass destruction [satsuriku heiki] known as an OE Weapon.
Unlike transceiver IC's that are based on traditional heterodyne mixers, the D2D technology achieves the simultaneous goals of cost, size, and power consumption without sacrificing the transceiver performance that designers have come to rely on from the traditional high performance Super Hets that the PV-1000 products replace," he continued.
The TRF6150 is a highly integrated RF IC based on an advanced direct conversion architecture, yielding bill of materials (BOM) reductions of about 30 percent versus competitive super heterodyne architectures.
The design incorporates single conversion heterodyne radio architecture using separate crystals for transmitting and receiving local oscillators.
Displacement Meter (LDDM) which uses electro-optics, optical heterodyne
Some studies indicate that infrared diode laser spectroscopy [18], infrared heterodyne ratiometry X19], and particularly infrared spectroscopy [20-24] may prove to be alternative, far more simple, and easy-to-operate optical methods for [sup.
Uncooled heterodyne receivers operating in the 750 to 1500 GHz frequency range are needed for the next-generation Earth Observation instruments.
The functional diagram is a typical one for coherent-pulse radar with absolute coherence, which means that all the frequencies-carrier and heterodyne, intermediate, repetition and sampling in the analog-digital converter-are provided by the unique quartz-locked oscillator.
For a heterodyne displacement interferometer, it is the component in the variable-length arm of the interferometer.
Washington, Nov 14 (ANI): The Naval Research Laboratory's (NRL) SHIMMER (Spatial Heterodyne Imager for Mesospheric Radicals) satellite has successfully observed Earth's highest clouds.
The LDS system is based on the principles of radar, the Doppler effect, and optical heterodyne.