Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Patent
1996-12-13
1999-11-23
Le, Huyen
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
381426, 381354, 381182, H04R 2500
Patent
active
059914254
ABSTRACT:
An arrangement for minimizing acoustic reflections and diffraction from an exterior surface of a diaphragm of a loudspeaker transducer. A layer of highly optimized acoustic foam is applied to an exterior surface of the transducer diaphragm. The acoustic foam is a polyether urethane material of approximately 2 lb/ft.sup.3 density with a skinned bottom surface, optional skinned top surface and optimized cell size and structure. The foam is die cut into a shape to conform to the concave shape of the transducer diaphragm without large air gaps or deformation of the foam. The acoustic foam surface prevents reflection and diffraction of another transducer's output off of the diaphragm of the treated transducer and provides a low pass filtering of the acoustic output of the treated transducer.
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Kananen Ronald P.
Le Huyen
Sony Corporation
Sony Electronics Inc.
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