heterodyne$512532$ - definizione. Che cos'è heterodyne$512532$
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Cosa (chi) è heterodyne$512532$ - definizione

ELECTRONIC OSCILLATOR
Heterodyne principle; Heterodyne detection; Hetrodyning; Hetrodyne; Downconverter; Radio frequency upconverter; RF Upconverter; Radio frequency downconverter; Heterodyning; Heterodyne detector; RF Downconverter; Frequency translation; Frequency shifting; Heterodyne conversion
  • Fessenden's heterodyne radio receiver circuit. The incoming radio frequency and local oscillator frequency mix in the crystal diode detector.

heterodyne         
['h?t(?)r?(?)d??n]
¦ adjective Electronics relating to or denoting the production of a lower frequency from the combination of two almost equal high frequencies, as used in radio transmission.
Derivatives
heterodyning noun
Origin
early 20th cent.: from hetero- + -dyne, suffix formed irregularly from Gk dunamis 'power'.
downconverter         
¦ noun Electronics a device that converts a signal to a lower frequency.
Derivatives
downconversion noun
Optical heterodyne detection         
Synthetic array heterodyne detection
Optical heterodyne detection is a method of extracting information encoded as modulation of the phase, frequency or both of electromagnetic radiation in the wavelength band of visible or infrared light. The light signal is compared with standard or reference light from a "local oscillator" (LO) that would have a fixed offset in frequency and phase from the signal if the latter carried null information.

Wikipedia

Heterodyne

A heterodyne is a signal frequency that is created by combining or mixing two other frequencies using a signal processing technique called heterodyning, which was invented by Canadian inventor-engineer Reginald Fessenden. Heterodyning is used to shift signals from one frequency range into another, and is also involved in the processes of modulation and demodulation. The two input frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer.

In the most common application, two signals at frequencies f1 and f2 are mixed, creating two new signals, one at the sum of the two frequencies f1 + f2, and the other at the difference between the two frequencies f1 − f2. The new signal frequencies are called heterodynes. Typically, only one of the heterodynes is required and the other signal is filtered out of the output of the mixer. Heterodyne frequencies are related to the phenomenon of "beats" in acoustics.

A major application of the heterodyne process is in the superheterodyne radio receiver circuit, which is used in virtually all modern radio receivers.