Coaxial mid-frequency and high-frequency loudspeaker

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure

Reexamination Certificate

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Details

C381S182000, C381S337000, C381S340000, C381S343000, C381S345000

Reexamination Certificate

active

07920712

ABSTRACT:
A loudspeaker is provided for receiving an electrical signal and transmitting an acoustic signal through a transmission medium. The system includes generally two elements: a coaxial transducer and an acoustic transformer. The coaxial transducer includes a high-frequency driver and a mid-frequency driver that are coaxially arranged. The acoustic transformer is acoustically coupled to the coaxial transducer and includes an initial horn section that expands from a first end to a second end in a direction away from the coaxial transducer. The initial horn section defines a plurality of openings therethrough, such that the initial horn section is acoustically opaque to high-frequency acoustic signals to thereby function as a waveguide for the high-frequency acoustic signals, while it is acoustically transparent to mid-frequency acoustic signals.

REFERENCES:
patent: 4706295 (1987-11-01), Putnam et al.
patent: 5109423 (1992-04-01), Jacobson et al.
patent: 5526456 (1996-06-01), Heinz
patent: 6094495 (2000-07-01), Rocha
patent: 6628796 (2003-09-01), Adamson
patent: 7236606 (2007-06-01), Werner
patent: 2005/0265570 (2005-12-01), Isotalo

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