New PDF release: Acoustics and Psychoacoustics, Third Edition

By David Howard, Jamie Angus

ISBN-10: 0080468489

ISBN-13: 9780080468488

ISBN-10: 0240519957

ISBN-13: 9780240519951

New reproduction. quickly delivery. should be shipped from US.

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By David Howard, Jamie Angus

ISBN-10: 0080468489

ISBN-13: 9780080468488

ISBN-10: 0240519957

ISBN-13: 9780240519951

New reproduction. quickly delivery. should be shipped from US.

Show description

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Extra resources for Acoustics and Psychoacoustics, Third Edition

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The purpose of this section is to examine some of these interactions as an understanding of them is necessary in order to understand both how musical instruments work and how sound propagates in buildings. 1 Superposition When sounds destructively interfere with each other they do not disappear. Instead they travel through each other. Similarly, when they constructively interfere they do not grow but simply pass through each other. This is because, although the total pressure, or velocity component, may lie anywhere between zero and the sum of the individual pressures or velocities, the energy flow of the sound waves is still preserved and so the waves continue to propagate.

The degree of diffraction depends on wavelength because it effectively takes a certain number of wavelengths for the edge of the wave to make the transition to shadow. Thus the amount of diffraction around an edge, such as a building or wall, will be greater at low and less at high frequencies. 38. 40. Here the sound wave is diffracted away from the edges of the opening. The amount of diffraction depends on the size of the opening relative to the wavelength. When the size of the wavelength is large relative to the opening the wave is diffracted strongly and when the wavelength is small relative to the opening then the diffraction is low.

The largest wave that can fit these constraints is a half wavelength and this sets the lowest frequency at which a standing wave can exist for a given distance between reflectors, and can be calculated using the following equation: λ v flowest ⇒ L = ᎏᎏ ⇒ λ 2L ⇒ flowest = ᎏᎏ 2 2L where flowest = the standing wave frequency (in Hz) L = the distance between the boundaries (in m) λ = the wavelength (in m) and v = the velocity of sound (in ms–1) Any multiple of half wavelengths will also fit between the two reflectors as well, and so there is in theory an infinite number of frequencies at which standing waves occur which are all multiples of flowest.

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Acoustics and Psychoacoustics, Third Edition by David Howard, Jamie Angus


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