Read e-book online Acoustic Absorbers and Diffusers - Theory, Design and PDF

By T. Cox, P. D'Antonio

ISBN-10: 0203492994

ISBN-13: 9780203492994

ISBN-10: 0203572157

ISBN-13: 9780203572153

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Additional info for Acoustic Absorbers and Diffusers - Theory, Design and Application

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9 shows a simple wavefront construction for this case. Traditionally, acousticians have utilized patches of absorption on wall surfaces to obtain dispersion. But this only leads to modest dispersion below frequencies where the dimension of the panel is roughly half a wavelength. To obtain high frequency diffuse reflections, the dimension of the patches must be much smaller and the distribution of the patches is important. e. providing diffsorption. This type of surface is discussed in more detail in Chapter 11.

For example, a balloon burst or a starting pistol might generate the short impulse, and the response might be measured with a microphone. First of all the direct sound from the source to receiver is received. Soon after, a series of reflections arrive, the level of these reflections generally decaying with time due to absorption at the room surfaces. The effects of the boundaries dominate the behaviour of sound in rooms, and it is at the boundaries where absorption is normally found. ) There is an increase in reflection density with time, and when the reflections become very dense this is termed the reverberant field.

First of all the direct sound from the source to receiver is received. Soon after, a series of reflections arrive, the level of these reflections generally decaying with time due to absorption at the room surfaces. The effects of the boundaries dominate the behaviour of sound in rooms, and it is at the boundaries where absorption is normally found. ) There is an increase in reflection density with time, and when the reflections become very dense this is termed the reverberant field. The energy of the reverberant reflections around the room is roughly constant and can be readily predicted provided the sound field is diffuse [3].

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Acoustic Absorbers and Diffusers - Theory, Design and Application by T. Cox, P. D'Antonio


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