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98 relations: Arc converter, Atomic clock, Audio frequency, Audio signal, Bandwidth (signal processing), Baseband, Beat (acoustics), Beat frequency oscillator, Betamax, Cable television headend, Coaxial cable, Communications satellite, Continuous wave, Damped wave, Demodulation, Detector (radio), DIN connector, Diode, Direct-conversion receiver, Edwin Howard Armstrong, Electroencephalography, Electronic countermeasure, Electronic filter, Electronic musical instrument, Filter (signal processing), Frequency, Frequency band, Frequency mixer, Frequency-division multiplexing, Gain–bandwidth product, Gilbert cell, Harmonic, Harmonic mixer, Headphones, Homodyne detection, Inductor, Intermediate frequency, Intermodulation, Isochronous timing, Kerr effect, Laser, Laser Doppler vibrometer, Lee de Forest, Lidar, Linear circuit, Linear function, List of trigonometric identities, Local oscillator, Magnetic core, Metal detector, ..., Microwave transmission, Modem, Modulation, Morse code, Nonlinear optics, NTSC, Optical fiber, Optical heterodyne detection, Optical modulator, PAL, Passband, Power amplifier classes, Power series, Radar, Radio frequency, Radio telescope, Regenerative circuit, Reginald Fessenden, Ring modulation, S-VHS, Satellite, Saturation (magnetic), Set-top box, Signal processing, Sine wave, Sony, Spark-gap transmitter, Superheterodyne receiver, Superposition principle, Taylor series, Telecommunications engineering, Telecommunications network, Telegraphy, Telemetry, Telephone network, Theremin, Transistor, Transmitter, Transverter, Triode, Tuned radio frequency receiver, U-matic, Vacuum tube, Variable capacitor, VHS, Videotape, Wireless telegraphy, 8 mm video format. Expand index (48 more) »
Arc converter
The arc converter, sometimes called the arc transmitter, or Poulsen arc after Danish engineer Valdemar Poulsen who invented it in 1903, was a variety of spark transmitter used in early wireless telegraphy.
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Atomic clock
An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.
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Audio frequency
An audio frequency (abbreviation: AF) or audible frequency is characterized as a periodic vibration whose frequency is audible to the average human.
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Audio signal
An audio signal is a representation of sound, typically as an electrical voltage for analog signals and a binary number for digital signals.
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Bandwidth (signal processing)
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.
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Baseband
Baseband is a signal that has a very narrow and near-zero frequency range, i.e. a spectral magnitude that is nonzero only for frequencies in the vicinity of the origin (termed f.
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Beat (acoustics)
In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies.
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Beat frequency oscillator
In a radio receiver, a beat frequency oscillator or BFO is a dedicated oscillator used to create an audio frequency signal from Morse code radiotelegraphy (CW) transmissions to make them audible.
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Betamax
Betamax (also called Beta, as in its logo) is a consumer-level analog-recording and cassette format of magnetic tape for video.
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Cable television headend
A cable television headend is a master facility for receiving television signals for processing and distribution over a cable television system.
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Coaxial cable
Cross-sectional view of a coaxial cable Coaxial cable, or coax (pronounced), is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.
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Communications satellite
A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.
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Continuous wave
A continuous wave or continuous waveform (CW) is an electromagnetic wave of constant amplitude and frequency, almost always a sine wave, that for mathematical analysis is considered to be of infinite duration.
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Damped wave
A damped wave is a wave whose amplitude of oscillation decreases with time, eventually going to zero, an exponentially decaying sinusoidal wave.
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Demodulation
Demodulation is extracting the original information-bearing signal from a carrier wave.
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Detector (radio)
In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage.
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DIN connector
A DIN connector is an electrical connector that was originally standardized in the early 1970s by the Deutsches Institut für Normung (DIN), the German national standards organization.
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Diode
A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other.
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Direct-conversion receiver
A direct-conversion receiver (DCR), also known as homodyne, synchrodyne, or zero-IF receiver, is a radio receiver design that demodulates the incoming radio signal using synchronous detection driven by a local oscillator whose frequency is identical to, or very close to the carrier frequency of the intended signal.
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Edwin Howard Armstrong
Edwin Howard Armstrong (December 18, 1890 – February 1, 1954) was an American electrical engineer and inventor, best known for developing FM (frequency modulation) radio and the superheterodyne receiver system.
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Electroencephalography
Electroencephalography (EEG) is an electrophysiological monitoring method to record electrical activity of the brain.
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Electronic countermeasure
An electronic countermeasure (ECM) is an electrical or electronic device designed to trick or deceive radar, sonar or other detection systems, like infrared (IR) or lasers.
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Electronic filter
Electronic filters are circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both.
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Electronic musical instrument
An electronic musical instrument is a musical instrument that produces sound using electronic circuitry.
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Filter (signal processing)
In signal processing, a filter is a device or process that removes some unwanted components or features from a signal.
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Frequency
Frequency is the number of occurrences of a repeating event per unit of time.
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Frequency band
A frequency band is an interval in the frequency domain, delimited by a lower frequency and an upper frequency.
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Frequency mixer
In electronics, a mixer, or frequency mixer, is a nonlinear electrical circuit that creates new frequencies from two signals applied to it.
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Frequency-division multiplexing
In telecommunications, frequency-division multiplexing (FDM) is a technique by which the total bandwidth available in a communication medium is divided into a series of non-overlapping frequency bands, each of which is used to carry a separate signal.
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Gain–bandwidth product
The gain–bandwidth product (designated as GBWP, GBW, GBP, or GB) for an amplifier is the product of the amplifier's bandwidth and the gain at which the bandwidth is measured.
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Gilbert cell
In electronics, the Gilbert cell is a type of mixer.
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Harmonic
A harmonic is any member of the harmonic series, a divergent infinite series.
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Harmonic mixer
The harmonic mixer and subharmonic mixer are a type of frequency mixer, which is a circuit that changes one signal frequency to another.
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Headphones
Headphones (or head-phones in the early days of telephony and radio) are a pair of small loudspeaker drivers worn on or around the head over a user's ears.
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Homodyne detection
Homodyne detection is a method of extracting information encoded as modulation of the phase and/or frequency of an oscillating signal, by comparing that signal with a standard oscillation that would be identical to the signal if it carried null information.
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Inductor
An inductor, also called a coil, choke or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.
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Intermediate frequency
In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.
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Intermodulation
Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities in a system.
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Isochronous timing
A sequence of events is isochronous if the events occur regularly, or at equal time intervals.
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Kerr effect
The Kerr effect, also called the quadratic electro-optic (QEO) effect, is a change in the refractive index of a material in response to an applied electric field.
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Laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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Laser Doppler vibrometer
A laser Doppler vibrometer (LDV) is a scientific instrument that is used to make non-contact vibration measurements of a surface.
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Lee de Forest
Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor, self-described "Father of Radio", and a pioneer in the development of sound-on-film recording used for motion pictures.
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Lidar
Lidar (also called LIDAR, LiDAR, and LADAR) is a surveying method that measures distance to a target by illuminating the target with pulsed laser light and measuring the reflected pulses with a sensor.
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Linear circuit
A linear circuit is an electronic circuit in which, for a sinusoidal input voltage of frequency f, any steady-state output of the circuit (the current through any component, or the voltage between any two points) is also sinusoidal with frequency f. Note that the output need not be in phase with the input.
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Linear function
In mathematics, the term linear function refers to two distinct but related notions.
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List of trigonometric identities
In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables where both sides of the equality are defined.
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Local oscillator
In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.
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Magnetic core
A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies.
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Metal detector
A metal detector is an electronic instrument which detects the presence of metal nearby.
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Microwave transmission
Microwave transmission is the transmission of information or energy by microwave radio waves.
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Modem
A modem (modulator–demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to decode the transmitted information.
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Modulation
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
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Morse code
Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment.
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Nonlinear optics
Nonlinear optics (NLO) is the branch of optics that describes the behavior of light in nonlinear media, that is, media in which the dielectric polarization P responds nonlinearly to the electric field E of the light.
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NTSC
NTSC, named after the National Television System Committee,National Television System Committee (1951–1953),, 17 v. illus., diagrs., tables.
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Optical fiber
An optical fiber or optical fibre is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.
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Optical heterodyne detection
Optical heterodyne detection is a method of extracting information encoded as modulation of the phase and/or frequency (wavelength) of electromagnetic radiation in the wavelength band of visible or infrared light.
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Optical modulator
An optical modulator is a device which is used to modulate a beam of light.
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PAL
Phase Alternating Line (PAL) is a color encoding system for analogue television used in broadcast television systems in most countries broadcasting at 625-line / 50 field (25 frame) per second (576i).
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Passband
A passband is the range of frequencies or wavelengths that can pass through a filter.
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Power amplifier classes
Power amplifier classes are, in electronics, letter symbols applied to different power amplifier types.
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Power series
In mathematics, a power series (in one variable) is an infinite series of the form where an represents the coefficient of the nth term and c is a constant.
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Radar
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
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Radio frequency
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
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Radio telescope
A radio telescope is a specialized antenna and radio receiver used to receive radio waves from astronomical radio sources in the sky in radio astronomy.
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Regenerative circuit
A regenerative circuit is an amplifier circuit that employs positive feedback (also known as regeneration); some of the output of the amplifying device is applied to its input without phase inversion, which reinforces the signal, increasing the amplification.
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Reginald Fessenden
Reginald Aubrey Fessenden (October 6, 1866 – July 22, 1932) was a Canadian-born inventor, who did a majority of his work in the United States and also claimed U.S. citizenship through his American-born father.
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Ring modulation
In electronics, ring modulation is a signal-processing function, an implementation of frequency mixing, performed by multiplying two signals, where one is typically a sine wave or another simple waveform and the other is the signal to be modulated.
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S-VHS
, the common initialism for Super VHS, is an improved version of the VHS standard for consumer-level video recording.
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Satellite
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.
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Saturation (magnetic)
Seen in some magnetic materials, saturation is the state reached when an increase in applied external magnetic field H cannot increase the magnetization of the material further, so the total magnetic flux density B more or less levels off.
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Set-top box
A set-top box (STB) or set-top unit (STU) (one type also colloquially known as a cable box) is an information appliance device that generally contains a TV-tuner input and displays output to a television set and an external source of signal, turning the source signal into content in a form that then be displayed on the television screen or other display device.
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Signal processing
Signal processing concerns the analysis, synthesis, and modification of signals, which are broadly defined as functions conveying "information about the behavior or attributes of some phenomenon", such as sound, images, and biological measurements.
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Sine wave
A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation.
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Sony
is a Japanese multinational conglomerate corporation headquartered in Kōnan, Minato, Tokyo.
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Spark-gap transmitter
A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using a spark gap.
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Superheterodyne receiver
A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.
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Superposition principle
In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.
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Taylor series
In mathematics, a Taylor series is a representation of a function as an infinite sum of terms that are calculated from the values of the function's derivatives at a single point.
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Telecommunications engineering
Telecommunications engineering is an engineering discipline centered on electrical and computer engineering which seeks to support and enhance telecommunication systems.
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Telecommunications network
A telecommunications network is a collection of terminal nodes, links are connected so as to enable telecommunication between the terminals.
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Telegraphy
Telegraphy (from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message.
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Telemetry
Telemetry is an automated communications process by which measurements and other data are collected at remote or inaccessible points and transmitted to receiving equipment for monitoring.
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Telephone network
A telephone network is a telecommunications network used for telephone calls between two or more parties.
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Theremin
The theremin (--> originally known as the ætherphone/etherphone, thereminophone or termenvox/thereminvox) is an electronic musical instrument controlled without physical contact by the thereminist (performer).
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Transistor
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.
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Transmitter
In electronics and telecommunications, a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna.
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Transverter
;In radio engineering: a transverter is a radio frequency device that consists of an upconverter and a downconverter in one unit.
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Triode
A triode is an electronic amplifying vacuum tube (or valve in British English) consisting of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode).
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Tuned radio frequency receiver
A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier.
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U-matic
U-matic is an analogue recording videocassette format first shown by Sony in prototype in October 1969, and introduced to the market in September 1971.
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Vacuum tube
In electronics, a vacuum tube, an electron tube, or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container.
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Variable capacitor
A variable capacitor is a capacitor whose capacitance may be intentionally and repeatedly changed mechanically or electronically.
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VHS
The Video Home System (VHS) is a standard for consumer-level analog video recording on tape cassettes.
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Videotape
Videotape is magnetic tape used for storing video and usually sound in addition.
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Wireless telegraphy
Wireless telegraphy is the transmission of telegraphy signals from one point to another by means of an electromagnetic, electrostatic or magnetic field, or by electrical current through the earth or water.
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8 mm video format
The 8mm video format refers informally to three related videocassette formats for the NTSC and PAL/SECAM television systems.
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Downconverter, Frequency shifting, Frequency translation, Heterodyne detection, Heterodyne detector, Heterodyne principle, Heterodyning, Hetrodyne, Hetrodyning, RF Downconverter, RF Upconverter, Radio frequency downconverter, Radio frequency upconverter.
References
[1] https://en.wikipedia.org/wiki/Heterodyne
