Loudspeaker
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United States of America Patent
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N/A
Issued Date -
Jan 27, 2005
app pub date -
Sep 15, 2004
filing date -
Oct 5, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A resonant bending wave loudspeaker comprising a panel-form acoustic radiator in the form of a beam and a vibration transducer mounted to the beam at a position to apply bending wave energy thereto to enable low frequency modes to be excited in the radiator both lengthwise of the radiator and crosswise of the radiator, and means mounting the radiator to permit the excitation of low frequency lengthwise and crosswise modes therein. From another aspect, the invention is a method of designing a resonant bending wave loudspeaker of the kind described above, comprising determining a position for locating the vibration transducer on the beam by deriving a model of the resonant modes in the beam from physical parameters of the beam, using the model to calculate the mechanical input power from the transducer to the beam as a function of frequency, calculating a measure of smoothness of the mechanical input power and selecting the position of the vibration transducer which has a desired value of the measure of smoothness.
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