New PDF release: Acoustics and Psychoacoustics, Third Edition (Music

By David Howard, Jamie Angus

ISBN-10: 0240519957

ISBN-13: 9780240519951

I am utilizing this for a category, and it has been a superb source. occasionally i locate it a piece dry, yet i am discovering such a lot of my sound recording and digital tune textbooks to be beautiful dry. for instance, keep away from & Jerse's textbook on computing device synthesis is large dull.

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Extra resources for Acoustics and Psychoacoustics, Third Edition (Music Technology)

Sample text

2 The level when uncorrelated sounds add On the other hand, if the sound waves are uncorrelated then they do not add algebraically, like correlated waves; instead we must add the powers of the individual waves together. As stated earlier, the power in a waveform is proportional to the square of the pressure levels so in order to sum the powers of the waves we must square the pressure amplitudes before adding them together. If we want the result as a pressure then we must take the square root of the result.

Diffraction, the size at which the object becomes significant is when it is about two thirds of a wavelength (2⁄3λ). Thus objects smaller than this will tend to scatter the energy in all directions whereas objects bigger than this will be more directional. In addition to the scattering effects, interference effects happen when the scattering object is about two thirds of a wavelength (2⁄3λ) in size. This is because at this frequency both reflection from, and diffraction around, the object is occurring.

34 demonstrate the standing wave for n ϭ 2 which is 5 times the lowest supported standing wave frequency. Standing waves can also occur for any type of wave propagation. 20, provided one uses the propagation velocity of the transverse wave for v. Standing waves in an acoustic context are often called the modes of a given system; the lowest frequency standing wave is known as the first order mode, and the multiples of this are higher order modes. So the third order mode of a system is the third lowest frequency standing wave pattern which can occur in it.

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Acoustics and Psychoacoustics, Third Edition (Music Technology) by David Howard, Jamie Angus

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