Noise measurement

Details Noise measurement Noise measurement

1982-06-04

1985-06-11

Hix, L. T.

Acoustics

Sound-modifying means

181242, H05K 500

Patent

active

045222835

ABSTRACT:
A sound absorbent pad, which comprises an interconnected cellular foam or a fibrous material, has a central hole which houses a microphone whose sound-sensing diaphragm is held flush with the center of the outer surface of the pad. The pad is a shallow dome or other shape which converges from a large base to a vertex and incorporates a plastic or metal plate, which being frusto-conical or another suitable shape. The pad with its plate acts to control noise which would otherwise be reflected from noise reflecting surface onto the microphone, thereby facilitating measurement of freefield noise levels.

REFERENCES:
patent: 3154171 (1964-10-01), Knutson et al.
patent: 4167985 (1979-09-01), Dunlavy
patent: 4314098 (1982-02-01), Maerfeld

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