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Signal processing technique
A heterodyne is the result of mixing two signals in a nonlinear device to produce new frequency components, notably sum and difference frequencies of the
Heterodyne
Topics referred to by the same term
Look up heterodyne in Wiktionary, the free dictionary. Heterodyne refers to a radio signal processing technique. Heterodyne may also refer to: Characters
Heterodyne_(disambiguation)
Type of radio receiver
receiver, commonly called the superhet, is a radio receiver that uses heterodyning to convert incoming radio-frequency (RF) signals to a fixed intermediate
Superheterodyne_receiver
In poetry, a heterodyne is a word in which the syllable receiving stress and/or pitch change is other than the syllable of longer quantity. This misalignment
Heterodyne_(poetry)
Comic book and webcomic series
"Adventure, Romance, Mad Science!". It follows the main character Agatha Heterodyne (introduced in 1995) through an alternate-history Victorian-style "steampunk"
Girl_Genius
Information method in electromagnetic radiation
Optical heterodyne detection is a method of extracting information encoded as modulation of the phase, frequency or both of electromagnetic radiation in
Optical_heterodyne_detection
Meter that displays the frequencies of an electronic signal
some of the signal to dissipate into the cavity, lowering the output. A heterodyne is a signal that is created via the mixture of two other signals. The
Frequency_meter
Audio device to detect the presence of bat sound signals
Common Pipistrelle Common Pipistrelle call heard on a heterodyne bat detector - 68 KB. This is a typical echolocation call with "feeding buzzes" when it
Bat_detector
Sensor implementation technique
signifies a single frequency, in contrast to the dual frequencies employed in heterodyne detection. In optical interferometry, homodyne signifies that the reference
Homodyne_detection
Measurement method using interference of waves
loudspeaker. Optical heterodyne detection is an extension of the heterodyne technique to higher (visible) frequencies. While optical heterodyne interferometry
Interferometry
Combined receiver and transmitter
An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher
Amateur_radio_repeater
Japanese anime series
giant robot, Dai-Guard, fight interdimensional alien beings called "Heterodynes". Unlike most giant robot anime, Dai-Guard performs on much more realistic
Dai-Guard
Multiple converters working in parallel
produce an intermediate frequency (IF) signal. This process, known as heterodyning, shifts the frequency of the received signal to a lower, more manageable
Time-interleaved_ADC
pinholes. There are two types of optical systems: heterodyne and fringe. Ware and Flygare developed a heterodyne-type ELS instrument, that was the first instrument
Electrophoretic light scattering
Electrophoretic_light_scattering
American writer, artist, and publisher (born 1970)
Award for Best Graphic Story in 2009 for Girl Genius, Volume 8: Agatha Heterodyne and the Chapel of Bones, a series which went on to win two more Hugo Awards
Kaja_Foglio
Oscillator used in radio receivers
The signal from the BFO is mixed with the received signal to create a heterodyne or beat frequency which is heard as a tone in the speaker. BFOs are also
Beat_frequency_oscillator
Number of occurrences or cycles per unit time
creates a heterodyne or "beat" signal at the difference between the two frequencies. If the two signals are close together in frequency the heterodyne is low
Frequency
Use of radio-frequency electromagnetic waves to determine position on the Earth's surface
Radio navigation or radionavigation is the application of radio waves to determine a position of an object on the Earth, either the vessel or an obstruction
Radio_navigation
Electronic component
creating a heterodyne (beat) signal at the difference fC - f0 between these frequencies, which was in the audio frequency range. The heterodyne provided
Tikker
Electronic musical instrument
was developed by Swiss microengineer Urz Gaudenz, using the original heterodyne oscillator architecture for a good playing experience, combined with Arduino
Theremin
heterodyne (beat) frequencies at the sum fC + fO and the difference fC − fO between these frequencies. By choosing fO correctly the lower heterodyne fC − fO
History_of_radio_receivers
ESA space telescope in service 2009–2013
Cardiff University was the lead institute. HIFI (Heterodyne Instrument for the Far Infrared) A heterodyne detector able to electronically separate radiation
Herschel_Space_Observatory
The objective of synthetic array heterodyne detection is to isolate regions of a large area detector surface into virtual pixels. This provides the benefits
Rainbow_heterodyne_detection
Early electronic musical instrument
specifications Polyphony none Oscillator vacuum tube or transistor Synthesis type heterodyne Input/output Keyboard Early models only used a wire controller with finger
Ondes_Martenot
backgrounds Crickets, unidentified mammal, and a bat social call recorded on a heterodyne detector set to 19 kHz - 379Kb, on a small nature reserve in North Devon
Bat_species_identification
demodulation), (3) a tikker, (4) a separate heterodyne, and (5) the autodyne. Fessenden researched the heterodyne detector. The autodyne was widely used in
Autodyne
Object detection system using radio waves
amplification devices, which is reduced using heterodyne amplification. Another reason for heterodyne processing is that for fixed fractional bandwidth
Radar
Astronomical methodology
Astronomical interferometers come in two types—direct detection and heterodyne. These differ only in the way that the signal is transmitted. Aperture
Astronomical optical interferometry
Astronomical_optical_interferometry
Noise-immune cavity-enhanced optical-heterodyne molecular spectroscopy (NICE-OHMS) is an ultra-sensitive laser-based absorption technique that utilizes
Noise-immune cavity-enhanced optical heterodyne molecular spectroscopy
Noise-immune_cavity-enhanced_optical_heterodyne_molecular_spectroscopy
Tabletop role-playing game
role-playing game. Page 11 is notably the first printed appearance of Agatha Heterodyne, the star of the 2001 comic series Girl Genius. The book details a fictional
GURPS_Illuminati_University
Astronomical experiment
focal-plane bolometer array, the telescope was upgraded in 2018 with a heterodyne receiver system operating at 345 GHz and 460 GHz. List of telescope types
Atacama Submillimeter Telescope Experiment
Atacama_Submillimeter_Telescope_Experiment
Frequency to which a carrier wave is shifted during transmission or reception
the carrier signal with a local oscillator signal in a process called heterodyning, resulting in a signal at the difference or beat frequency. Intermediate
Intermediate_frequency
Method of communication by radio waves
receiver. This problem was solved by Reginald Fessenden in 1901. In his "heterodyne" receiver, the incoming radiotelegraph signal is mixed in the receiver's
Wireless_telegraphy
circumvent both of these problems: Noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS). The first and so far ultimate realization
Laser_absorption_spectrometry
Speed sensor
the measurement volume Laser surface velocimeters work in the so-called heterodyne mode, i.e. the frequency of one of the laser beams is shifted by an offset
Laser_surface_velocimeter
Array of antennas creating a steerable beam
2017-08-09. "An 8x8 Heterodyne Lens-less OPA Camera" (PDF). Archived (PDF) from the original on 2017-07-13. "A One-Dimensional Heterodyne Lens-Free OPA Camera"
Phased_array
Circuit that creates new frequencies from two signals
shift signals from one frequency range to another, a process known as heterodyning, for convenience in transmission or further signal processing. For example
Frequency_mixer
Telescope 2012 Thijs de Graauw Short Wavelength Spectrometer on ISO and the Heterodyne Instrument For the Infrared on Herschel 2013 Keith Matthews Infrared astronomical
Joseph Weber Award for Astronomical Instrumentation
Joseph_Weber_Award_for_Astronomical_Instrumentation
Performance measure in radio electronics
principle. In such a radio receiver, a local oscillator (LO) is used to heterodyne or "beat" against the incoming radio frequency (RF), generating sum and
Image_response
Oscillator used to change Signal frequency in electronics
frequency of a signal. This frequency conversion process, also called heterodyning, produces the sum and difference frequencies from the frequency of the
Local_oscillator
Manufacturer
for testing optical components, laser displacement interferometers, and heterodyne optical encoders for stage position metrology. Zygo's optics business
Zygo_Corporation
signal is typically achieved by direct detection, not heterodyning. However, optical heterodyne detection is possible and has been actively studied since
Intensity_modulation
1977 runway collision in the Canary Islands
was audible in the KLM cockpit as a three-second-long shrill sound (or heterodyne). This caused the KLM crew to miss the latter portion of the tower's response
Tenerife_airport_disaster
Astronomy telescope in Mexico
Alfonso Serrano Pérez-Grovas. The set of LMT instrumentation is built by heterodyne receivers and broad-band continuum cameras, some of them still under development:
Large_Millimeter_Telescope
American journalist
KSPC-FM in Claremont, California (88.7-FM and KSPC online). His nom de heterodyne is Randy Brian. Skretvedt's interests in vintage media started in childhood
Randy_Skretvedt
American physicist
noise in Josephson-effect mixers and their potential for submillimeter heterodyne detection". ProQuest. Retrieved October 7, 2025. "Yale Professors Race
Robert_J._Schoelkopf
Interference pattern between signals of similar frequency
sensory meridian response (ASMR) Consonance and dissonance Gamelan tuning Heterodyne Moiré pattern, a form of spatial interference that generates new frequencies
Beat_(acoustics)
Community radio station in Carbondale, Illinois
station is currently owned by local 501(c)3 nonprofit under the name Heterodyne Broadcasting. WDBX became officially licensed and operational at the start
WDBX
Tool measuring EM radiation at 0.3–300-GHz frequency
weak and the signal needs to be amplified by around 80 dB. Therefore, heterodyne techniques are often used to convert the signal down to lower frequencies
Microwave_radiometer
Space mission to study light from interstellar particles
The Spatial Heterodyne Interferometric Emission Line Dynamics Spectrometer (SHIELDS) mission is intended to study light from interstellar particles that
SHIELDS
Electrical device which utilizes a sensor to detect nearby motion
to motion of an object toward (or away from) the receiver result in a heterodyne signal at a low audio frequency. An ultrasonic transducer emits an ultrasonic
Motion_detector
Method of spatial measurement using laser
phase of the reflected light). Coherent systems generally use optical heterodyne detection. This is more sensitive than direct detection and allows them
Lidar
Acoustic surveillance device
Thing (listening device) List of laser articles Laser turntable Optical heterodyne detection Galeyev (1996). Glinsky (2000), pp. 260–261. O'Malley (2009)
Laser_microphone
Defunct US-based electronics company (2001–2018)
-3 and -3B units, respectively, except they provided an extra set of heterodyne oscillator crystals, enabling them to cover extra bands – useful for military
Rockwell_Collins
Minimum sampling rate to avoid aliasing
is to convert it to baseband. One way to do that is frequency-mixing (heterodyne) the bandpass function down to the frequency range (0, B). One of the
Nyquist_rate
Brand of audio processing equipment
in 1975 in Massachusetts. The name is shorthand for "Audio Perception Heterodyne Exciter", in reference to its original product, the Aphex Aural Exciter
Aphex_Systems
OCLC 877288185. "Adventures in Castle Heterodyne, p. 1". girlgeniusonline.com. "Adventures in Castle Heterodyne, p. 2". girlgeniusonline.com. Polhemus
List of fictional literature featuring opera
List_of_fictional_literature_featuring_opera
All Latin and Greek roots beginning with G
didynamous, dynamic, dynamism, dynamite, dynamo, dynast, dynastic, dynasty, heterodyne, metadynamics dys- badly, ill Greek δυσ- (dus-) dysentery, dysphagia,
List of Greek and Latin roots in English/A–G
List_of_Greek_and_Latin_roots_in_English/A–G
Potential for two waves to interfere
astronomyPages displaying short descriptions of redirect targets Optical heterodyne detection – Information method in electromagnetic radiation Quantum biology –
Coherence_(physics)
Optical method of measuring fluid flow
phenomenon was used to develop the first laser Doppler flowmeter using heterodyne signal processing. This instrument became known as the laser Doppler velocimeter
Laser_Doppler_velocimetry
interferometer (FECO) Gabor hologram Gires–Tournois etalon Heterodyne interferometer (see heterodyne) Holographic interferometer Jamin interferometer Laser
List of types of interferometers
List_of_types_of_interferometers
Topics referred to by the same term
affinity regulatory peptide, the protein Pleiotrophin Heterodyne Array Receiver Program, a heterodyne array receiver at the James Clerk Maxwell Telescope
Harp_(disambiguation)
Imaging technique
can be frequency-shifted by a tunable quantity. This enables optical heterodyne detection, a frequency-conversion process aimed at shifting a given radiofrequency
Digital_holography
Canadian-American electrical engineer and inventor (1866–1932)
radio reception. As his work progressed, Fessenden also developed the heterodyne principle, which used two closely spaced radio signals to produce an audible
Reginald_Fessenden
Electronic circuit using positive feedback
radiotelegraphy is provided by the use of a separate oscillator, known as a heterodyne oscillator or beat oscillator. Providing the oscillation separately from
Regenerative_circuit
1964 transport helicopter family by Sikorsky
the Israel-Egypt border. Investigation determined that high-frequency heterodyne vibration, induced by a late control column attitude correction during
Sikorsky_CH-53_Sea_Stallion
NLCs Night Shining Clouds
over a period of weeks or months by ground instruments and the Spatial Heterodyne IMager for MEsospheric Radicals (SHIMMER) instrument on the NRL/STP STPSat-1
Noctilucent_cloud
Red supergiant star in the constellation Orion
amounts of radiation in excess of the photospheric contribution. Using heterodyne interferometry, it was concluded that the red supergiant emits most of
Betelgeuse
Biogeochemical cycle
atomic oxygen in the mesosphere and lower thermosphere using terahertz heterodyne spectroscopy. Communications Earth & Environment, 2(1), 19. Hingane, L
Ozone–oxygen_cycle
Oscillator whose frequency can be tuned over some range
required complexity of the IF filter. The advantage of using a VFO as a heterodyning oscillator is that only a small portion of the radio receiver (the sections
Variable-frequency_oscillator
Electromagnetic radiation with wavelengths from 1 m to 1 mm
electronic or mechanical techniques. Frequency counters or high frequency heterodyne systems can be used. Here the unknown frequency is compared with harmonics
Microwave
or video frequency that the receiver is recovering. IF amplifiers in heterodyne receivers apply gain in a frequency band between the input radio frequency
Intermediate-frequency amplifier
Intermediate-frequency_amplifier
Type of AM radio station
limitations: a lack of good frequency control during the 1920s, resulting in heterodyne tones that were encountered far beyond the range of understandable audio
Clear-channel_station
Russian composer
cross", an instrument similar to a theremin in which the pitch of the heterodyning oscillators is controlled by body capacitance – pitch would rise and
Nikolai_Obukhov
Color encoding system for analogue television
remains of it, above the colour frequency range. This is usually done by heterodyning for PAL (as well as NTSC). But the FM nature of colour in SECAM allows
PAL
Alloy
than some of its more economical competitors. HgCdTe can be used as a heterodyne detector, in which the interference between a local source and returned
Mercury_cadmium_telluride
Russian inventor (1896–1993)
inventor of the Ondes Martenot, a keyboard-based instrument using the heterodyning method Robert Moog Raymond Scott In this name that follows East Slavic
Leon_Theremin
Device which diffracts light via sound waves
Laser Doppler vibrometer Film scanner Confocal microscopy Synthetic array heterodyne detection Hyperspectral Imaging Acousto-optics Acousto-optic deflector
Acousto-optic_modulator
Light wave manipulation
PMID 26367953. S2CID 15059522. Fatemi R.; et al. (2016). A One-Dimensional Heterodyne Lens-Free OPA Camera. Conference on Lasers and Electro-Optics, OSA Technical
Phased-array_optics
American astrophysicist
oscillators produced the local oscillator signal for the observatorys' heterodyne receivers. 1998 MacArthur Fellows Program 2004 Magellanic Gold Medal 2006
John_Carlstrom
superheterodyne receiver solved this problem, and the first radios with a heterodyne radio receiver went for sale in 1924. But it was costly, and the technology
History_of_radio
Process of varying one or more properties of a periodic waveform
access methods Channel coding Codec Demodulation Electrical resonance Heterodyne Line code Modem Neuromodulation RF modulator Ring modulation Types of
Signal_modulation
Broadcast magnetic tape-based videotape format
black-and-white (B/W) only, later VTRs supported color television, with a heterodyne playback. Still later units had time base correction playback, like the
Type_A_videotape
NASA project concerning dust in space
monatomic chlorine, and monatomic hydrogen. According to NASA, Spatial Heterodyne Imager for Mesospheric Radicals (SHIMMER ) instrument will track the CARE
Charged Aerosol Release Experiment
Charged_Aerosol_Release_Experiment
AM signal with a low-power or suppressed carrier
original carrier frequency when receiving such a signal will cause a heterodyne. Suppressed carriers are often used for single sideband (SSB) transmissions
Reduced-carrier_transmission
Iranian-American planetary scientist
experimental protocol for constructing a spatial heterodyne spectrometer. She developed a visible spatial heterodyne spectrometer for detecting Sodium D-lines
Sona_Hosseini
Planned Chinese space telescope
It is a high-resolution spectrometer and the first planned spaceborne heterodyne receiver to use a niobium nitride-based superconducting tunnel junction
Xuntian
American radio pioneer (1890–1960)
on single-control tuning (1912), and in 1913 discovered the "rectifier heterodyne" which increased radio receiver sensitivity by a factor of 100. In 1913
John_Vincent_Lawless_Hogan
Gyroscope that uses fiber optics
measurement unit Inertial navigation Vibrating structure gyroscope Optical heterodyne detection Ring laser gyroscope Quantum gyroscope Vali, V.; Shorthill,
Fibre-optic_gyroscope
Magnetic tape-based videocassette format for camcorders
on each video track such that adjacent tracks would produce one of two heterodyne frequencies if the head mistracked. The system automatically adjusted
8_mm_video_format
there are no other heterodyne products. In practice, the multiplier is not perfect, and the input frequencies and other heterodyne products will be present
Harmonic_mixer
Airline bombing incident in 1970
(Both ATC and pilot keyed microphones at the same time creating a small heterodyne.) (Muffled voice from Swissair crew indicates either issues with the radio
Swissair_Flight_330
German physicist and electrical engineer (1886-1976)
July 2024. Schottky, Walter (October 1926). "On the Origin of the Super-Heterodyne Method". Proceedings of the IRE. 14 (5): 695–698. doi:10.1109/JRPROC.1926
Walter_Schottky
All Latin and Greek roots beginning with D
didynamous, dynamic, dynamism, dynamite, dynamo, dynast, dynastic, dynasty, heterodyne, metadynamics dys- badly, ill Greek δυσ- (dus-) dysentery, dysphagia,
List of Greek and Latin roots in English/D
List_of_Greek_and_Latin_roots_in_English/D
Radio frequencies used in civil aviation
if both transmissions are received with identical signal strength, a heterodyne will be heard where no such indication of blockage would be evident in
Airband
Type of radio design
and software-defined radio systems. Crystal radio Harmonic mixer Heterodyne Heterodyne detection Homodyne detection IQ imbalance, a problem affecting direct-conversion
Direct-conversion_receiver
American engineer
One-Dimensional Heterodyne Lens-Free OPA Camera (PDF), OSA, June 2016 "Ultra-Thin Camera Creates Images Without Lenses". Caltech. June 21, 2017. An 8x8 Heterodyne Lens-less
Ali_Hajimiri
Method used by several animal species to determine location using sound
Pipistrellus pipistrellus, an FM bat. The ultrasonic call has been "heterodyned" – multiplied by a constant frequency to produce frequency subtraction
Animal_echolocation
American inventor (1873–1961)
then used in the spring of 1913 to operate a low-powered transmitter for heterodyne reception of Federal Telegraph arc transmissions. However, strong evidence
Lee_de_Forest
(ISBN 0-930289-23-4), category "Other Forms" 2009: Girl Genius, Volume 8: Agatha Heterodyne and the Chapel of Bones by Kaja & Phil Foglio, art by Phil Foglio, colors
List of award-winning graphic novels
List_of_award-winning_graphic_novels
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