By Leo L. Beranek, Tim Mellow
Acoustics: Sound Fields and Transducers is a completely up to date model of Leo Beranek's vintage 1954 ebook that keeps and expands at the original's unique acoustical basics whereas including functional formulation and simulation tools.
Serving either as a textual content for college students in engineering departments and as a reference for working towards engineers, this e-book specializes in electroacoustics, examining the habit of transducers by way of electro-mechano-acoustical circuits. Assuming wisdom of electric circuit concept, it starts off through guiding readers during the fundamentals of sound fields, the legislation governing sound new release, radiation, and propagation, and basic terminology. It then strikes directly to examine:
- Microphones (electrostatic and electromagnetic), electrodynamic loudspeakers, earphones, and horns
- Loudspeaker enclosures, baffles, and waveguides
- Miniature purposes (e.g., MEMS in I-Pods and cellphones)
- Sound in enclosures of all sizes, comparable to study rooms, places of work, auditoriums, and dwelling rooms
Numerical examples and precis charts are given in the course of the textual content to make the cloth simply acceptable to sensible layout. it's a necessary source for experimenters, acoustical experts, and to people who count on being engineering designers of audio equipment.
- An replace for the electronic age of Leo Beranek's vintage 1954 ebook Acoustics
- Provides distinct acoustic basics, permitting higher realizing of complicated layout parameters, size tools, and data
- Extensive appendices conceal frequency-response shapes for loudspeakers, mathematical formulation, and conversion factors
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Extra info for Acoustics: Sound Fields and Transducers
70) This result could alternatively have been obtained by setting ZT ¼ N in Eq. 58). 71) The pressure will equal zero at one or more planes in the tube whenever l is greater than l/4. Some examples are shown in Fig. 8. Here again, quantity n is equal to an approximate number of half wavelengths in the tube. Refer once more to Fig. 7 which is drawn for t ¼ 0. The instantaneous particle velocity is at its maximum (as a function of time). By comparison, in Fig. 8 at t ¼ 0, the instantaneous sound pressure is zero.
3 GENERAL SOLUTIONS OF THE ONE-DIMENSIONAL WAVE EQUATION The one-dimensional wave equation was derived with either sound pressure or particle velocity as the dependent variable. Particle displacement, or the variational density, may also be used as the dependent variable. This can be seen from Eqs. 13a) and the conservation of mass, which requires that the product of the density and the volume of a small box of gas remain constant. 30) and so Let 30 CHAPTER 2 The wave equation and solutions where r is the incremental change in density.
We shall use equivalent circuits extensively in this text. Also, it will be shown in Figs. 7 how the impedances of a blocked tube and open tube respectively may be represented by arrays of electrical circuit elements. Impedance measurement. 62) which is independent of u~0 . 63) which is the principle of an impedance tube which is used for measuring samples of material for which the impedance is unknown. An elegant feature of the method is that the measurement is independent of the piston velocity or actual magnitudes of the pressures.
Acoustics: Sound Fields and Transducers by Leo L. Beranek, Tim Mellow