Acoustics: Sound Fields and Transducers by Leo L. Beranek, Tim Mellow PDF

Acoustics Sound

By Leo L. Beranek, Tim Mellow

ISBN-10: 0123914213

ISBN-13: 9780123914217

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 exact acoustical basics whereas including useful formulation and simulation tools.

Serving either as a textual content for college kids in engineering departments and as a reference for working towards engineers, this e-book specializes in electroacoustics, reading the habit of transducers by way of electro-mechano-acoustical circuits. Assuming wisdom of electric circuit conception, it begins by way of guiding readers throughout the fundamentals of sound fields, the legislation governing sound iteration, radiation, and propagation, and normal terminology. It then strikes directly to examine:

  • Microphones (electrostatic and electromagnetic), electrodynamic loudspeakers, earphones, and horns
  • Loudspeaker enclosures, baffles, and waveguides
  • Miniature functions (e.g., MEMS in I-Pods and cellphones)
  • Sound in enclosures of all sizes, comparable to classrooms, places of work, auditoriums, and dwelling rooms

Numerical examples and precis charts are given through the textual content to make the fabric simply appropriate to functional layout. it's a useful source for experimenters, acoustical specialists, and to people who expect being engineering designers of audio equipment.

  • An replace for the electronic age of Leo Beranek's vintage 1954 publication Acoustics
  • Provides exact acoustic basics, allowing greater figuring out of advanced layout parameters, size equipment, and data
  • Extensive appendices conceal frequency-response shapes for loudspeakers, mathematical formulation, and conversion factors

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Additional resources for Acoustics: Sound Fields and Transducers

Example text

The “2” in parentheses denotes an outgoing cylindrical wave and the “1” denotes an incoming one. 93) p~þ eÀjðkwÀp=4Þ þ p~À e jðkwÀp=4Þ : p~ðwÞ w/N ¼ pkw We can see from Fig. 10 that cylindrical waves, which are essentially two-dimensional due to the lack of axial dependency, differ from plane ones in two respects: Firstly the radial wavelength is longer nearer the axis of symmetry than in the far field. Secondly they decay in amplitude as they spread out, adopting an inverse square-root law in the far field.

Hence the power remains constant. 107) Particle velocity. With the aid of Eq. 108) Specific acoustic impedance. The specific acoustic impedance is found from Eq. 107) divided by Eq. 109) Plots of the magnitude and phase angle of the impedance as a function of kr are given in Fig. 14 and Fig. 15 respectively. 110) The impedance here is nearly purely resistive and approximately equal to the characteristic impedance for a plane freely traveling wave. In other words, the specific acoustic impedance a large distance from a spherical source in free space is nearly equal to that in a tube in which no reflections occur from the end opposite the source.

27) yields Eq. 23), the wave equation for a cylindrical wave. Likewise, substituting S(r) ¼ 4pr2 in Eq. 27) and replacing x with r yields Eq. 24), the wave equation for a spherical wave. 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.

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Acoustics: Sound Fields and Transducers by Leo L. Beranek, Tim Mellow

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