Patent ID: 6181797
Filing Date: 2001-01-30
Classification: H04R

Abstract:
A method of reproducing sound within a passenger cabin from an audio signal having lower, mid and upper frequency range components, said method comprising:(a) placing a closed volume flat panel speaker within the trim liner of the passenger cabin, wherein said closed volume flat panel speaker comprises:a panel having an inside surface;a plate having an inside surface;one or more piezoelectric elements attached to the inside surface of the panel and facing the inside surface of the plate, said one or more piezoelectric elements capable of driving the panel to reproduce mid and upper range frequency sounds within the passenger cabin;a frame; andattachment means that seal the plurality of edges of the panel and the plurality of edges of the plate to the frame to form an enclosure having a closed volume therebetween; and(b) placing at least one low frequency dynamic loudspeaker within the passenger cabin.