Electrical audio signal processing systems and devices – Loudspeaker feedback
Patent
1994-12-27
1997-05-13
Kuntz, Curtis
Electrical audio signal processing systems and devices
Loudspeaker feedback
381159, 381190, H04R 2500
Patent
active
056299877
ABSTRACT:
Loudspeaker system with closed housing for improved bass reproduction. The loudspeaker system operates utilizing pressure control in the closed loudspeaker housing. This pressure control suppresses pressure changes of the air inside the housing. The control circuit comprises a pressure sensor, a controller, a power amplifier and an electrodynamic transducer inside the housing. The membrane of the transducer is covered with piezoelectric material and conducting coatings forming piezoelectric sensors to measure the changes of the air pressure upon the surface. The piezoelectric material consists of polyvinylidene fluoride, PVDF. The sensors are specially shaped to avoid distortions. They differ in thickness for the elimination of acceleration-dependent signal terms.
REFERENCES:
patent: 2948778 (1960-08-01), Clements
patent: 3366748 (1968-01-01), Ashworth
patent: 5327504 (1994-07-01), Hobelsberger
Kuntz Curtis
Le Huyen D.
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