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What is the directivity index?

April 26, 2017directivity index

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What is the directivity index?

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The directivity index (Di) is an expression in decibels of the directionality of a sound source. Narrow coverage systems have a high directivity index, whereas wide coverage systems have a low one. Di is the decibel form of directivity Q factor, so both are related as Di = 10*log(Q).