Resolution enhanced sound detecting apparatus

Acoustics – Anatomic or prosthetic relation – Ear and mouth

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179 1DM, 181148, 340 8LF, G10K 1000

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active

041490347

ABSTRACT:
Apparatus for enhancing the resolution of a sound detector of the type which includes an acoustic mirror for focusing sound from an object onto a microphone to enable the determination of the location from which the sound arises. The enhancement apparatus includes an enclosure surrounding the space between the mirror and microphone, and containing a gas heavier than air, such as Freon, through which sound moves slower and therefore with a shorter wavelength than in air, so that a mirror of given size has greater resolving power. An acoustically transparent front wall of the enclosure which lies forward of the mirror, can include a pair of thin sheets with slightly pressured air between them, to form an end of the region of heavy gas into a concave shape.

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patent: 3895188 (1975-07-01), Ingraham
R. Schlinker et al., "Enhancement of Directional Microphone," AIAA Paper No. 73-1040, Oct. 15, 1973.
F. Grosche et al., "On Aero Acoustic Measurements", AIAA, 1976.
L. Knox, "Underwater Detection", IBM Tech. Discl. Bull., Nov. 1961.

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