Audio Engineer's Reference Book (2nd Edition) by Michael Talbot-Smith

By Michael Talbot-Smith

An authoritative reference on all features of audio engineering and expertise together with simple arithmetic and formulae, acoustics and psychoacoustics, microphones, loudspeakers and studio installations.

Compiled via a world staff of specialists, the second one variation was once up-to-date to maintain abreast of fast-moving parts reminiscent of electronic audio and transmission expertise. a lot of the cloth has been revised, up-to-date and accelerated to hide the very most up-to-date ideas.

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Extra info for Audio Engineer's Reference Book (2nd Edition)

Example text

3 Plane and spherical waves, the inverse square law The terms ‘plane wave’ and ‘spherical wave’ are used, sometimes to the confusion of the inexperienced, to indicate the apparent ‘shape’ of a wavefront at a particular point. There is no sharp division between the two. Basically, if waves originate from a distant small source, or a close large plane surface, so that the curvature of the wavefront is insignificant, they may be described as plane waves. On the other hand, if the source is small and close to the observer the curvature may be significant and they are then called spherical waves.

Taking steel as an example, for steel y ' 2 ð 1011 N/m2 and r ' 8 ð 103 kg m/m3 , giving c D 500 m/s. 48 A pipe, open at both ends. f D 1/2l y/r As a matter of interest the same expression applies to a pipe closed at both ends, except that there are now no end corrections to be applied and the expression becomes: f D nc/2l. 1/2 Substitution of relevant values shows that the frequency of longitudinal vibrations is very much greater than that of transverse vibration. It may also be noted that tension does not enter into the formula for longitudinal vibrations.

There is no heat transfer from high pressure (warmer) regions to low pressure (cooler) regions. The presence of materials that can effect a degree of heat transfer, and even substances such as fibre glass can do this, cause partly isothermal conditions to occur, with a consequent reduction in c. A loudspeaker cabinet containing such materials may thus have an acoustic volume which is greater than its physical dimensions. 2 Frequency and wavelength The frequency of any wave is defined as the number of complete waves emitted or received in one second.

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