Electrical audio signal processing systems and devices – Including frequency control – Having crossover filter
Reexamination Certificate
2007-03-09
2011-12-20
Pham, Thanh V (Department: 2894)
Electrical audio signal processing systems and devices
Including frequency control
Having crossover filter
C381S061000, C381S071120, C381S087000, C381S089000
Reexamination Certificate
active
08081775
ABSTRACT:
Loudspeaker apparatus comprise commonly some sort of casings or assemblies, in which one or more single speakers are integrated and which are used to convert electrical signals into sound. A loudspeaker apparatus1for radiating sound in a hemisphere is disclosed having a center axis9, the loudspeaker apparatus1comprising: a set of midrange drivers6a, b, c, d, e, f, whereby the midrange drivers6a, b, c, d, e, fare controlled and/or arranged in a Bessel configuration and are operable to provide a first acoustic field in the hemisphere, a set of tweeter drivers7a, b, c, dadapted to provide a second acoustic field in the hemisphere, whereby the first and the second acoustic field are respectively arranged symmetrically, whereby the main sound emitting directions of the single tweeter drivers7a, b, c, dare angled to the center axis9.
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Wieslaw R. Woszczyk: “Bessel Filters As Loudspeaker Crossovers” Audio Engineering Society, [Online] Oct. 23, 1982, XP002469107.
Pham Thanh V
Robert & Bosch GmbH
Striker Michael J.
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