Speaker device

Details Speaker device Speaker device

2008-05-27

2008-05-27

Le, Huyen (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having acoustic wave modifying structure

C381S337000, C381S345000

Reexamination Certificate

active

07379556

ABSTRACT:
A speaker device includes an acoustic capacity unit; an acoustic pipe connected to the acoustic capacity unit; and a driving speaker attached to the acoustic capacity unit. The acoustic capacity unit and the acoustic pipe constitute the Helmholtz resonator, and resonate at a predetermined Helmholtz resonant frequency. On the other hand, the acoustic pipe itself has a resonant frequency. By setting the resonant frequency of the acoustic pipe to be 0.5 to 2.5 octaves higher than the Helmholtz resonant frequency, the speaker device can be obtained which outputs signals of continuous frequency band from the Helmholtz resonant frequency to the resonant frequency of the acoustic pipe.

REFERENCES:
patent: 5031500 (1991-07-01), Koike et al.
patent: 5875255 (1999-02-01), Campbell
patent: 5917923 (1999-06-01), Caron et al.
patent: 6522759 (2003-02-01), Mori
patent: 05-041896 (1993-02-01), None
patent: 06-038290 (1994-02-01), None
patent: 2001-016673 (2001-01-01), None

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