By David Howard, Jamie Angus
I am utilizing this for a category, and it has been an exceptional source. occasionally i locate it a piece dry, yet i am discovering such a lot of my sound recording and digital track textbooks to be lovely dry. for instance, sidestep & Jerse's textbook on computing device synthesis is great dull.
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Extra resources for Acoustics and Psychoacoustics, Third Edition (Music Technology)
In this case there is a transition between a bounded and an unbounded region but it is not free space, because the wave cannot propagate in all directions. 20. At the boundary between the bounded and unbounded regions the molecules in the unbounded region find it a lot easier to move than in the bounded region. The result is that, at the boundary, the sound wave has a pressure component which is close to zero and a large velocity component. Therefore at this point all the energy in the sound is in the kinetic energy of the moving air molecules, in other words, the velocity component.
In this region the sound field can vary wildly depending on the local variation of the vibration amplitudes of the source. 16 describes the reduction in sound intensity for a source which radiates in all directions. However, this is only possible when the sound source is well away from any surfaces that might reflect the propagating wave. Sound radiation in this type of propagating environment is often called the free field radiation, because there are no boundaries to restrict wave propagation.
At the boundary between the object and the air the sound wave must have zero velocity, because it can’t move the wall. This means that at that point all the energy in the sound is in the compression of the air, or pressure. As the energy stored in the pressure cannot transfer in the direction of the propagating wave, it bounces back in the reverse direction, which results in a change of phase in the velocity component of the wave. 19 shows this effect using our golf ball and spring model. One interesting effect occurs due to the fact that the wave has to change direction and that the spring connected to the immovable boundary is compressed twice as much compared to a spring well away from the boundary.
Acoustics and Psychoacoustics, Third Edition (Music Technology) by David Howard, Jamie Angus