Acoustic device

Details Acoustic device Acoustic device

2006-06-13

2006-06-13

Le, Huyen (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Driven diverse static structure

C381S431000, C381S423000, C381S337000, C381S354000

Reexamination Certificate

active

07062051

ABSTRACT:
A method of improving the modal resonance frequency distribution of a panel (2) for a distribution resonant mode bending wave acoustic device involves analysing the distribution of the modal resonance frequencies of the panel, identifying a modal resonance frequency that is non-uniformly spaced relative to adjacent modal resonance frequencies, identifying a location on said panel that exhibits anti-nodal behaviour at said modal resonance frequency and changing the local impedance to bending wave vibration at said location (6). The method has particular application to distributed mode loudspeakers (1).

REFERENCES:
patent: 5615275 (1997-03-01), Bertagni
patent: 6332029 (2001-12-01), Azima et al.
patent: 6731764 (2004-05-01), Asada et al.
patent: 2003/0035560 (2003-02-01), Harris et al.
patent: WO 97/09842 (1997-03-01), None
patent: WO 99/02012 (1999-01-01), None
patent: WO 99/56497 (1999-11-01), None
patent: WO 00/15000 (2000-03-01), None
patent: WO 00/22877 (2000-04-01), None
International Search Report dated May 26, 2003.

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