Frequency conversion

Frequency conversion may refer to different processes affecting frequency of physical phenomena:

A frequency changer is an electronic device that converts alternating current (AC) of one frequency to alternating current of another frequency.
- A variable-frequency drive is a type of frequency changer
Frequency conversion in nonlinear optics may refer to various manipulations of the frequency of light.
A Heterodyne is used in signal electronics to convert frequencies.

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