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Crossover Systems in Digital Loudspeakers

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A digital loudspeaker is one that does not contain any form of embedded digital-to-analog converter. From a consideration of the mathematical operations describing the digital-to-analog conversion process in a digital loudspeaker, it is concluded that the use of N identical analog filters (where N is the number of bits) filtering each bit driver separately offers a practical alternative to digital signal processing. The implementation of a multiple-driver multiple-voice-coil digital loudspeaker is described. The effect of component tolerances in the crossover and compatibility with the requirements of the current drive are evaluated. The interactions between motion emf, driving current, and mutual coupling emfs are considered. It is concluded that this method of crossover implementation is both viable and achievable.

JAES Volume 50 Issue 10 pp. 791-798; October 2002
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