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Abstract

In sound generating systems, it has been ascertained that various factors cause spurious, audible emanations when transducers of reasonable size and cost are driven in complex motions characteristic of typical high fidelity audio reproduction. It is shown that phase effects, unidirectional components, and transient (start-stop) effects give rise to such spurious emanations and that these center about the resonant frequency of the transducer. Means are disclosed which significantly improve the clarity of reproduction by minimizing these spurious emanations. In a typical system in which different transducers are used for different frequency ranges, the spurious emanations are reduced by change of amplitude or frequency or both, without affecting transducer performance, to levels at which they are substantially inaudible. Either or both electronic and acoustic techniques may be used for these purposes.

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First Claim