Browse Prior Art Database

Microphone Protective Device

IP.com Disclosure Number: IPCOM000090307D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Milburn, LH: AUTHOR

Abstract

In test equipment used to check head-to-disk interference occurring in disk pack 6 operating within an enclosure or shroud 1, microphone 2 is employed to detect the acoustical characteristic within the environment of the rotating pack. To avoid fatigue breakage of the microphone coil leads caused by low-frequency turbulent air excitation of the microphone diaphragm, microphone 2 is suspended with spider 3. The entire assembly is enclosed by cover 4 to provide an area around the microphone which is shielded from external acoustical noise. A Saran membrane 5 is fastened across the opening in the shroud, to create an acoustical window and to prevent the moving air within the shroud from creating undesirable noise.

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Microphone Protective Device

In test equipment used to check head-to-disk interference occurring in disk pack 6 operating within an enclosure or shroud 1, microphone 2 is employed to detect the acoustical characteristic within the environment of the rotating pack. To avoid fatigue breakage of the microphone coil leads caused by low-frequency turbulent air excitation of the microphone diaphragm, microphone 2 is suspended with spider 3. The entire assembly is enclosed by cover 4 to provide an area around the microphone which is shielded from external acoustical noise. A Saran membrane 5 is fastened across the opening in the shroud, to create an acoustical window and to prevent the moving air within the shroud from creating undesirable noise. This arrangement provides an average reduction of microphone diaphragm displacement of 55 to 1 up to 30 Hz, as compared to previous mounting arrangements, and eliminates coil lead breakage. The arrangement is generally applicable to systems in which there are sound pressure variations within an enclosed volume and where a microphone is disposed adjacent to an enclosure.

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