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IEVref:801-25-67ID:
Language:enStatus: Standard
Term: directivity factor
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Definition: a) of an electroacoustic transducer for sound emission, at a specified frequency, ratio of the square of the free-field sound pressure at a fixed point on the principal axis, to the mean-square sound pressure over the surface of a sphere concentric with the effective acoustic centre of the transducer, and passing through the fixed point

b) of an electroacoustic transducer for sound reception, at a specified frequency, ratio of the square of the free-field sensitivity to sound waves that arrive along the principal axis, to the mean-square sensitivity to a succession of sound waves that arrive at the transducer with equal probability from all directions


Publication date:1994-07
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