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sound field

The sound field is the space in which the sound emitted by a sound source propagates. Sound waves, which require a medium for transmission, are responsible for the propagation of sound. If no medium is present, as in a vacuum, no sound can propagate.

The sound field consists of a near field and the far field. The near field is the area near the sound source in which the sound wave builds up. Propagation occurs in this area, which extends up to ten times the wavelength, with spherical sound waves. This is followed by the far field. It is the area in which the sound pressure( SPL) drops by 6 dB when the distance from the loudspeaker is doubled. Both fields have characteristic properties regarding sound pressure and sound velocity. Another characteristic value to describe the sound field is the sound power.

Sound fields are also characterized by the way they propagate. For example, in a free sound field that has no obstacles, sound can propagate without reflection or absorption. It is different in a diffuse sound field, where the sound is reflected and absorbed by obstacles.

Informations:
Englisch: sound field
Updated at: 10.08.2007
#Words: 185
Links: sound, field, space (SP), sound source, medium
Translations: DE
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