Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent
1993-09-17
1995-12-26
Kuntz, Curtis
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
381159, 181160, H04R 2500
Patent
active
054795206
ABSTRACT:
An enclosure (35) of a loudspeaker (37) is provided with a plurality of tubes (43) of different length via which the sound is emitted in order to achieve frequency spreading of resonance peaks in the SPL (sound pressure level) curve. The side walls (46, 47) of the tubes (43) have openings (63) via which the tubes are coupled to common Helmholtz resonators (59, 61) in order to suppress undesirable resonances in the tubes (43). By spreading the resonance peaks it is possible to use Helmholtz resonators of smaller dimensions than in the case that the sound would emanate via a single tube. This results in a loudspeaker system (33) with more compact and cheaper Helmholtz resonators (59, 61).
REFERENCES:
patent: 1969704 (1934-08-01), D'Alton
patent: 2193399 (1940-03-01), Fisher
patent: 2670053 (1954-02-01), Doms
patent: 4142603 (1979-03-01), Johnson
patent: 5137110 (1992-08-01), Bedard, Jr. et al.
Bax Johannes W. T.
Nieuwendijk Joris A. M.
Van Den Thillart Martinus P. M.
Kraus Robert J.
Kuntz Curtis
Le Huyen D.
U.S. Philips Corporation
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