Get Acoustics: Sound Fields and Transducers PDF

Get Acoustics: Sound Fields and Transducers PDF

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 e-book that keeps and expands at the original's targeted acoustical basics whereas including functional formulation and simulation equipment.

Serving either as a textual content for college kids in engineering departments and as a reference for practising engineers, this booklet specializes in electroacoustics, studying the habit of transducers by way of electro-mechano-acoustical circuits. Assuming wisdom of electric circuit thought, it begins through guiding readers during the fundamentals of sound fields, the legislation governing sound iteration, radiation, and propagation, and common 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, equivalent to classrooms, workplaces, auditoriums, and dwelling rooms

Numerical examples and precis charts are given in the course of the textual content to make the fabric simply acceptable to useful 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 ebook Acoustics
  • Provides particular acoustic basics, permitting higher figuring out of advanced layout parameters, dimension tools, and data
  • Extensive appendices hide frequency-response shapes for loudspeakers, mathematical formulation, and conversion factors

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Extra resources for Acoustics: Sound Fields and Transducers

Sample text

14 Plot of the magnitude of the specific acoustic-impedance ratio jZsj/(r0c) in a spherical freely traveling wave as a function of kr, where k is the wave-number equal to u/c or 2p/l and r is the distance from the center of the spherical source. jZsj is the magnitude of ratio of pressure to particle velocity in a spherical free-traveling wave, and r0c is the characteristic impedance of air. 1 1 10 kr FIG. 15 Plot of the phase angle, in degrees, of the specific acoustic-impedance ratio jZsj/r0c in a spherical wave as a function of kr, where k is the wave-number u/c or 2p/l and r is the distance from the center of the spherical source.

If l À nl/2 is very near zero, the maximum velocity in the tube will become very large. Let us choose a frequency such that n ¼ 2 as shown. Two factors determine the amplitude of the sine function in the tube. First, at x ¼ l the sine curve must pass through the point u0. Second, at x ¼ 0 the sine curve must pass through zero. It is obvious that one and only one sine wave meeting these conditions can be drawn so that the amplitude is determined. Similarly, we could have chosen a frequency such that n ¼ 2, but where the length of the tube is slightly less than two half wavelengths.

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.

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


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