Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure
Reexamination Certificate
2005-10-13
2010-11-16
Ensey, Brian (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having acoustic wave modifying structure
C381S345000, C381S423000, C381S432000, C381S431000, C381S338000, C181S148000
Reexamination Certificate
active
07835537
ABSTRACT:
A loudspeaker may include a baffle, a planar diaphragm transducer carried by the baffle and having a front surface for radiating acoustic energy therefrom, and a slotted waveguide adjacent the front surface of the planar diaphragm transducer. The planar diaphragm transducer may be operable to a desired high frequency, and the slotted opening may have a width not substantially greater than a wavelength corresponding to the desired high frequency. For example, for a desired high frequency of about 20 KHz, the slotted opening may have a width not greater than about two-thirds of an inch. Accordingly, the loudspeaker including the slotted waveguide may provide nearly constant horizontal directivity over a large angle. In another embodiment, the loudspeaker may include a conical diaphragm transducer with a slotted waveguide adjacent its front surface.
REFERENCES:
patent: 3424873 (1969-01-01), Walsh
patent: 4134471 (1979-01-01), Queen
patent: 4472834 (1984-09-01), Yamamuro et al.
patent: 4856071 (1989-08-01), Marquiss
patent: 4870691 (1989-09-01), Mindel
patent: 4975965 (1990-12-01), Adamson
patent: 5901235 (1999-05-01), Thigpen et al.
patent: 6059069 (2000-05-01), Hughes, II
patent: 6324052 (2001-11-01), Azima et al.
patent: 6411718 (2002-06-01), Danley et al.
patent: 6513622 (2003-02-01), Gelow et al.
patent: 6621909 (2003-09-01), Webb et al.
patent: 6760462 (2004-07-01), Thigpen
patent: 6950530 (2005-09-01), Baird et al.
patent: 7218749 (2007-05-01), Noponen et al.
patent: 2005/074318 (2005-08-01), None
“What is Mad?”, Magnetic Audio Devices, pp. 1-2, available at www.getmad.com/whatismad.html.
“Bohlender Graebener NEO8 Planar Transducer”, Parts Express, pp. 1-2, 1996-2005 Parts Express, available at www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-712&ctab=15.
“The VMPS RM 40 Loudspeaker”, VMPS Audio Products, pp. 1-2, 2002, available at www.vmpsaudio.com/wulf2.htm.
“SLS Loudspeakers PRD Planar Ribbon Drivers—a Breakthrough Technology for Contemporary Loudspeaker Industry”, SLS Loudspeakers, 2001, pp. 1-14, available at www.slsloudspeakers.com/media/docs/RibbondriverWhitepaper.pdf.
“Pro-Line Radia Professional Speakers from Bohlender-Graebener . . . An Intelligent Solution for Sound in the New Millennium”, Radia Professional Speakers, 2000, pp. 1-17, available at www.fuziontech.co.uk/ftproot/Fuzion/Datasheets....
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Ensey Brian
Joshi Sunita
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