By David Howard, Jamie Angus
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Additional info for Acoustics and Psychoacoustics, Third Edition
There are several acoustical situations which can cause interference effects. The obvious ones are when two loudspeakers radiate the same sound into a room, or when the same sound is coupled into a room via two openings which are separated. 24 Interference arising from reflections from a boundary. 1m less obvious situation is when there is a single sound source spaced away from a reflecting boundary, either bounded or unbounded. 24. This latter situation can often cause problems for recording or sound reinforcement due to a microphone picking up a direct and reflected sound component and so suffering interference.
This happens because the energy in the travelling wave must always exist at a pressure node carried in the velocity component and at a velocity node the energy is carried in the pressure component. 8 Standing waves at other boundaries There are two other pairs of boundary arrangements which can support standing waves. 32, is the case of a bounded-to-unbounded propagation boundary at both ends. An example would be a tube or pipe which is open at both ends. 32. 31 The pressure components of a standing wave between two bound–unbound boundaries.
Furthermore this reduction in intensity is purely a function of geometry and is not due to any physical absorption process. In practice, there are sources of absorption in air, for example impurities and water molecules, or smog and humidity. These sources of absorption have more effect at high frequencies and as a result, sound not only gets quieter but also gets duller as one moves away from a source. The amount of excess attenuation is dependent on the level of impurities and humidity and is therefore variable.
Acoustics and Psychoacoustics, Third Edition by David Howard, Jamie Angus