By Leo L. Beranek, Tim Mellow
Acoustics: Sound Fields and Transducers is a completely up to date model of Leo Beranek's vintage 1954 publication that keeps and expands at the original's distinctive acoustical basics whereas including sensible formulation and simulation tools.
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Additional info for Acoustics: Sound Fields and Transducers
At all frequencies the impedance is reactive and either leads or lags the pressure by exactly 90 depending, respectively, on whether Xs is negative or positive. The reactance Xs varies as shown in Fig. 9. 74) This approximation is valid whenever the product of frequency times the distance from the rigid end of the tube to the point of measurement is very small. If the second term is very small, then it may be neglected with respect to the first. Let us see how small the ratio of the distance l0 to the wavelength l must be if the second term of Eq.
5 Equivalent electrical circuit for a tube with a termination impedance ZT, in which the single tube is represented by two tube impedances, each in parallel with an external impedance. The piston is represented by a current generator. The reason for this will become clearer in the next chapter. 40 CHAPTER 2 The wave equation and solutions series impedances are the complex conjugates of each other and we just see the characteristic impedance r0c at the input terminals. We shall use equivalent circuits extensively in this text.
FIG. 21 Spherical Bessel functions of the second kind. The inclination equation in q. After equating the right hand side of Eq. 156) Equating the left hand side of Eq.
Acoustics: Sound Fields and Transducers by Leo L. Beranek, Tim Mellow