Antenna patterns measured with too short a transmission length contain errors, because the fields in "near field" are curved rather than planar.
Pertains to that range of listening distances in which the sounds reaching the ears are predominantly direct. See "far field," "critical distance."
The near field is the region within one wavelength of an antenna, where the electric and magnetic fields are not related to each other solely by the characteristic impedance of free space. Non-ionising radiation Radiation that does not break chemical bonds in matter. When non-ionising radiation passes through body tissues, it does not have sufficient energy to damage DNA directly.
the situation where you are close to the source of the field. Electric and magnetic fields are not coupled to each other and radiation is small; the two fields exist separately. Nearly always the case at 50 Hz
The region within approximately two meters of the loudspeakers. Listening tests conducted in the near field reveal different aspects of a loudspeaker's performance compared with listening in the far field.
Also described as "close field", these are monitors designed to be used in close proximity to the listener. The advantage is that the listener hears more of the direct sound from the speakers and less of the reflected sound from reflections in the room.
The region of the field immediately surrounding an antenna where the inductive and capacitive fields predominate. In this region, the angular distribution of the field varies with distance from the antenna.
The electromagnetic field that exists within one wavelength of a source of radiation.
Technically, the region where the particle velocity is mostly out of phase with the sound pressure-meaning that it can be very close to the listener at higher frequencies. Popularly-and incorrectly-it is often considered to be any point where the direct sound is significantly louder than the reflected sound.
The region sufficiently close to the speaker that direct radiation predominates and reflected sound has minimal sonic influence.
Some people prefer the term "close field", to describe a loudspeaker system designed to be used close to the listener. The advantage is that the listener hears more of the direct sound from the speakers and less of the reflected sound from the room.
The area up to one foot from the sound source. - Category: Guitar Repair/Building