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 precise acoustical basics whereas including sensible formulation and simulation tools.

Serving either as a textual content for college kids in engineering departments and as a reference for practising engineers, this publication makes a speciality of electroacoustics, reading the habit of transducers by means of electro-mechano-acoustical circuits. Assuming wisdom of electric circuit concept, it begins by way of guiding readers in the course of the fundamentals of sound fields, the legislation governing sound new release, 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 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 in the course of the textual content to make the fabric simply acceptable to useful layout. it's a important 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 e-book
*Acoustics* - Provides precise acoustic basics, permitting greater figuring out of advanced layout parameters, size tools, and data
- Extensive appendices conceal frequency-response shapes for loudspeakers, mathematical formulation, and conversion factors

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**Example text**

EX. 3A 6 407 u(x,t) −6 407 4 407 ⋅ 628 ξ (x,t) −4 407 ⋅ 628 FIG. EX. 4 SOLUTION OF WAVE EQUATION FOR AIR IN A TUBE TERMINATED BY AN IMPEDANCE For this example of wave propagation, we shall consider a hollow cylindrical tube, terminated at one end (x ¼ 0) by an impedance ZT and at the other (x ¼ l) end by a flat vibrating piston (see Fig. 4). Alternatively, we could have interchanged the positions of the piston and termination impedance, but the arrangement shown has been chosen because it simplifies the equations.

4 Tube with rigid side walls and termination impedance ZT. The velocity at x ¼ 0 has a value of u0 cos ut m/s. Driving piston l u (l , t ) = ℜ(u~0 ) 38 CHAPTER 2 The wave equation and solutions Transmitted and reflected pressures. Eliminating p~À between Eqs. 52) r0 cðe jkl þ eÀjkl Þ þ ZT ðe jkl À eÀjkl Þ Similarly, eliminating p~þ between Eqs. 55) p~þ ¼ and p~À ¼ where p~À is the transmitted pressure magnitude and p~þ is reflected pressure magnitude. The amount of sound reflected depends on how the tube is terminated.

38) 32 CHAPTER 2 The wave equation and solutions where T ¼ 1/f is the period of the wave. 42) vx2 c2 which is generally known as the Helmholtz wave equation. Because the wave is propagated without change of shape, we need consider, in the steady state, only those solutions to the wave equation for which the time dependence at each point in space is sinusoidal and which have the same angular frequencies nu as the source. 43) pn ðx; tÞ ¼ pnþ eÀjun x=c þ pnÀ e jun x=c e jun t ; where the þ and À subscripts indicate the forward and backward traveling waves respectively.

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