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Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition by Tim Mellow, Leo Beranek

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15.6. A practical delay line

Delay Path Length. We saw in the last section that discretization of the delay into rings of finite width produces irregularities in the response at higher frequencies. However, the delay was an ideal delay like that produced by a DSP, whereas in practice, the delay is more likely to take the form of an analog delay line on the high-voltage side of the transformer, such as that shown in Fig. 15.12. Otherwise, a separate stepping up transformer would be needed to feed each ring. Unless complicated inductors with center taps or a very large number of inductors are used, analog delay lines tend to introduce a degree of attenuation at the higher frequencies. In this case, this turns out to have a smoothing effect ...

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