Acoustical device

Claim 1

A HEARING AID, COMPRISING A HOUSING HAVING MEANS TO BE SUPPORTED ON THE HEAD OF THE WEARER, THE HOUSING HAVING A WALL WITH AN APERTURE THERETHROUGH, HEARING AID CIRCUITRY WITHIN THE HOUSING AND INCLUDING A MICROPHONE ADJACENT THE INTERIOR OF SAID WALL, SAID MICROPHONE HAVING A SOUND-RECEIVING OPENING ALIGNED WITH SAID APERTURE, RESILIENT MEANS SEALING SAID MICROPHONE TO THE WALL AND AROUND THE ENTIRE PERIPHERY OF THE APERTURE THEREIN, A DISC OF POROUS MATERIAL AND HAVING A CENTRAL PORTION OVERLYING SAID APERTURE AT THE EXTERIOR OF THE WALL AND ABSORBING THE ENERGY OF THE WIND PASSING ALONG THE HOUSING AND THEREBY PREVENTING GENERATION OF RANDOM NOISE ADJACENT THE OPENING IN THE WALL, SAID DISC ALSO HAVING AN OUTER PERIPHERAL PORTION LYING AGAINST THE EXTERIOR OF THE WALL ADJACENT THE APERTURE, AND A RIGID RING AROUND THE PERIPHERY OF THE DISC AND SECURED TO THE WALL, SAID RING HAVING AN INWARDLY PROTRUDING LIP ENGAGING AND HOLDING THE DISC AGAINST THE WALL, THE EXTERIOR PERIPHERY OF THE RING BEING SMOOTHLY CONTOURED TO PERMIT WIND FLOW THEREAROUND, SAID DISC HAVING AN OUTER SURFACE LYING SUBSTANTIALLY FLUSH WITH THE LIP OF THE RING AND BEING RESILIENTLY DEFORMABLE TO PERMIT REMOVAL OF THE DISC FROM THE RING, WHEREBY TO ELIMINATE WIND TURBULENCE AT THE APERTURE AND THEREBY MATERIALLY REDUCE GENERATION OF RANDOM NOISE.