near-field

near-field
1. noun
a) In physical acoustics, the region of space within a distance a fraction of a wavelength from a sound source. Accordingly, the outer boundary of the near-field region is closer for high-pitched sound than for low-pitched sound.
b) In radio-frequency electromagnetic technology, the region within about half a wavelength from an electrically small antenna. More specifically it is the region within the radiansphere.
In loudspeaker acoustics, referring to a region where the intensity of direct, unreflected sound from the source (such as a loudspeaker) is significantly dominant over any indirect or reflected sound.

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