By David Howard, Jamie Angus

ISBN-10: 0240519957

ISBN-13: 9780240519951

I am utilizing this for a category, and it has been an excellent source. occasionally i locate it a section dry, yet i am discovering such a lot of my sound recording and digital song textbooks to be lovely dry. for instance, ward off & Jerse's textbook on machine synthesis is great uninteresting.

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

Sample text

The essential requirement is a cyclic path in which the time of propagation results in the wave travelling around this path in phase with the previous time round. 35 shows an example of a two-dimensional standing wave. 35 A twodimensional standing wave. 16 with one end closed. 985 m In this case the first mode is at half the frequency of the pipe which is open at both ends, an octave below on the musical scale which is F2. The second mode is now at three times the lowest mode, which is approximately equal to C4 on the musical scale.

However, as we shall see later, this results in a waveform that is aperiodic. So for the square wave the second partial is the third harmonic and the third partial is the fifth harmonic. 48 The effect of adding harmonically related sine waves together with different phase shifts. 0 frequency domain representations, because they are made up of sine waves of different amplitudes and frequencies. Some examples of other waveforms in both the time and frequency domains are shown in Chapter 3. 2 The effect of phase The phase, which expresses the starting value of the individual sine wave components, also affects the waveshape.

43. 43 Scattering from an object at low frequencies. 44 Scattering from an object at high frequencies. 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.

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


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