Patent ID: 6522760
Filing Date: 2003-02-18
Classification: H04R

Abstract:
A distributed mode active acoustic device comprising a plural-sided panel member and a transducer coupled to the panel member, the panel member being capable of sustaining bending waves in an operative frequency range over an active area of the transverse extent of the panel member with a distribution of resonant modes of bending wave vibration determining acoustic performance in conjunction with the transducer, the panel member having at least one in-board region of said active area where a plurality of lower frequency resonant bending wave modes in the operative frequency range have vibrationally active anti-nodes, the transducer being coupled to the panel member at a marginal position of the panel member for beneficial operative interaction of the transducer with the panel member so as to leave said at least one in-board region substantially unobstructed, said marginal position corresponding to an orthogonal coordinate of said at least one in-board region.