Acoustics: Sound Fields and Transducers by Leo L. Beranek, Tim Mellow 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 publication that keeps and expands at the original's targeted acoustical basics whereas including useful 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 ebook makes a speciality of electroacoustics, examining the habit of transducers as a result of electro-mechano-acoustical circuits. Assuming wisdom of electric circuit idea, it begins by means of guiding readers throughout the fundamentals of sound fields, the legislation governing sound iteration, 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, resembling classrooms, workplaces, auditoriums, and dwelling rooms

Numerical examples and precis charts are given in the course of the textual content to make the cloth simply appropriate to useful layout. it's a priceless source for experimenters, acoustical specialists, and to those that count on being engineering designers of audio equipment.

  • An replace for the electronic age of Leo Beranek's vintage 1954 ebook Acoustics
  • Provides precise acoustic basics, allowing larger figuring out of advanced layout parameters, dimension tools, and data
  • Extensive appendices conceal frequency-response shapes for loudspeakers, mathematical formulation, and conversion factors

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Extra resources for Acoustics: Sound Fields and Transducers

Example text

Only the relative pressure ratio is needed to calculate the impedance. However, when the impedance is a large multiple (or small fraction) of r0c, the calibration of the microphones becomes very critical, as does the accuracy of the distances l1 and l2 between them and the sample. Rigid termination (infinite impedance). If we let ZT ¼ N in Eq. 65) Refer to Fig. 6. If the length l and the frequency are held constant, the particle velocity will vary from a value of zero at x ¼ 0 to a maximum at x ¼ l/4, that is, at x equal to one-fourth wavelength.

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.

61) the equivalent circuit for which is shown in Fig. 5. Amazingly, a tube with any termination impedance ZT can be represented by the impedance of a blocked tube (with ZT ¼ N) in series with an open tube (with ZT ¼ 0) and two external impedances connected across them, which are related to the termination impedance ZT and characteristic impedance r0c. However, this makes more sense when we consider that when the impedance of the open tube is zero, the impedance of the blocked tube is infinite and vice versa.

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

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