In this region, the sound field does not decrease by 6 dB each time the distance from the source is increased. Ģ) Near field of a source is the region close to a source. Free field is characterized by a 6 dB drop in sound pressure level and intensity level each time the distance from the source is doubled. This condition holds in an anechoic room where all the sound striking the walls is absorbed. It is classified according to the manner and the environment in which the sound waves travel.ġ) Free field describes sound propagation in idealized free space where there is no reflections.
The sound field is a region where there is sound. Sound propagates at different speeds depending upon media, for example the speed of sound in air is about 340 m/s, whereas in water it reaches around 1500 m/s. On the other hand, sound may be unwanted, in the case it is called noise, either because of its effect on humans or malfunction of physical equipment, or its interference with the perception or detection of other sounds so abatement of this phenomena becomes necessary. It enables us to communicate with other people. It provides enjoy such as listening to a singing bird.
Sound can be defined as any pressure variation which can be detected by human ear.
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