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 specific acoustical basics whereas including sensible formulation and simulation equipment.
Serving either as a textual content for college kids in engineering departments and as a reference for working towards engineers, this booklet makes a speciality of electroacoustics, studying the habit of transducers by way of electro-mechano-acoustical circuits. Assuming wisdom of electric circuit thought, it starts off by means of guiding readers throughout 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, equivalent to study rooms, places of work, auditoriums, and residing rooms
Numerical examples and precis charts are given through the textual content to make the cloth simply acceptable to sensible layout. it's a precious 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 distinct acoustic basics, allowing larger 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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Additional resources for Acoustics: Sound Fields and Transducers
2. Determine the power flow in a freely traveling wave at a fixed point as a function of time. Answer: pðtÞ ¼ Kcosut uðtÞ ¼ pðtÞ=rc Power flow ¼ pÃ u ¼ ðK 2 =rcÞcos2 ut ¼ ðK 2 =rcÞð1 À sin2 utÞ Thus the power flows by a point in a freely traveling wave like a series of “sausages”. This is explained by referring back to Fig. 1. The vibrating surface sends power into the wave when it is moving either to the right or the left. At the instant whenever the surface changes direction, the power drops to zero.
Note also that CA ¼ V/gP0, from Eq. 19). 3. A cylindrical tube is to be used in an acoustic device as an impedance element. (a) The impedance desired is that of a compliance. 4 Â 103 rayls at an angular frequency of 1000 rad/s? (b) What is the relative magnitude of the first and second terms of Eq. 74) for this case? Solution. 1 m. Hence, the second term is about 3% of the first term. 5 SOLUTION OF WAVE EQUATION FOR AIR IN A TUBE FILLED WITH ABSORBENT MATERIAL Ducts and tubes are often filled with absorbent material in order to minimize standing waves, such as in transmission-line loudspeaker enclosures or exhaust-pipe mufflers, for example.
129) where If both sides of Eq. 128) are equated to a constant of separation n2, then Eq. 128) can then be separated into three equations for each ordinate as follows. The radial equation in w. 133) where Jn(x) and Yn(x) are Bessel functions of the first and second kind respectively, as plotted in Fig. 17 and Fig. 18. The “2” in parentheses denotes an outgoing cylindrical wave and the “1” denotes an incoming one. FIG. 17 Bessel functions of the first kind. 58 CHAPTER 2 The wave equation and solutions FIG.