By David Howard, Jamie Angus
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Additional resources for Acoustics and Psychoacoustics, Third Edition
42. Here the wave diffracts around the object and meets behind it. The effect is also a function of the size of the object with respect to the wavelength. When the size of the wavelength is large relative to the object then the wave is diffracted strongly around it and the object has little influence on the wave propagation. 42. The size at which an object becomes significant with respect to a wavelength is when its size is again about two thirds of a wavelength (2⁄3λ). 43. As in the case of diffraction, it is the size of the object with respect to the wavelength that determines how much, and in what way, the energy is scattered.
10 Calculate the increase in signal level when two vocalists sing together at the same level and when a choir of N vocalists sing together, also at the same level. ෆෆ+ෆPෆ) = ͙N ෆPෆෆ = P͙N ෆ 2 2 2 2 Thus the increase in level, for uncorrelated sources of equal amplitude, is proportional to the square root of the number of sources. 41P How does the addition of sources affect the sound pressure level (SPL), the sound power level (SWL), and the sound intensity level (SIL)? For the SWL and SIL, because we are adding powers, the results will be the same whether the sources are correlated or not.
29 shows that there are points of maximum and minimum amplitude of the pressure and velocity components. 29 the velocity component is zero at the two boundaries and the midpoint. 29 The velocity components of a standing wave between two hard boundaries. 30 The pressure and velocity components of a standing wave between two hard boundaries. Velocity component Pressure component maximum points are called pressure antinodes. Note that as the number of half wavelengths in the standing waves increases then the number of nodes and antinodes increases, and for hard reflecting boundaries the number of pressure nodes is equal to, and the number of pressure antinodes is one more than, the number of half wavelengths.