In the physical sciences and in telecommunication, the term frequency shift has the following meanings:
- Any change in frequency
- A Doppler shift
- Any change in the frequency of a radio transmitter or oscillator. (Note: In the radio regime, frequency shift is also called rf shift.)
- Frequency-shift telegraphy
- In facsimile, a frequency modulation system where one frequency represents picture black and another frequency represents picture white. Frequencies between these two limits may represent shades of gray
- An intentional frequency change used for modulation purposes
- Spectrum shifting in signal processing, see Discrete Fourier transform#The shift theorem
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
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