1) Denoting a device or method of combining two
→ electromagnetic waves
of different → frequency
(a locally generated wave and an incoming wave)
in a → nonlinear device
to produce two frequencies which are
equal to the → sum and
→ difference of the first two.
The phenomenon is the counterpart of → beats
produced by → sound waves.
For example, heterodyning a 100-kHz and a 10-kHz signal will
produce a 110-KHz and a 90-kHz signal.
See also → homodyne.
Heterodyne, from → hetero- + -dyne, from Gk. dynamics→ dynamics; → receiver.
Fr.: interféromètre hétérodyne
An → interferometer using a technique that involves introducing a small → frequency shift between the optical frequencies of the two interfering light beams. This results in an intensity modulation at the → beat frequency of the two beams for any given point of the → interference pattern. A convenient way of introducing such a frequency shift is by means of an acousto-optic modulator.
→ heterodyne; → interferometer.
girande-ye heterodini (#)
Fr.: récepteur hétérodyne
→ heterodyne; → receiver.
Fr.: technique hétérodyne
→ heterodyne; → technique.
girande-ye abar-heterodini (#)
Fr.: récepteur superhétérodyne
A radio receiver which uses the → superheterodyne technique.
→ super-; → heterodyne; → receiver.
Fr.: technique superhétérodyne
The technique used in a radio receiver in which the frequency of an incoming signal is changed by adding it to a signal generated within the receiver to produce fluctuations or beats of a frequency equal to the difference between the two signals. See also → mixer.