Patent ID: 6298140
Filing Date: 2001-10-02
Classification: H04R

Abstract:
A transducer for accurately and efficiently reproducing a stimulus applied thereupon, operating in a fluid ambient medium, having an effective output spectrum defined within a predetermined effective range of frequencies, comprising:(a) an oscillating medium assembly of layered components suspended in said ambient medium, comprising at least one oscillating member delimited by at least one supporting member with predetermined geometry defining the boundary of said oscillating member;(b) said oscillating medium with predetermined boundary conditions imposed on the oscillatory motion of said oscillating member;(c) said oscillatory motion induced by standing waves associated with the intrinsic normal mode patterns of antinodes delimited by nodes, and with the characteristic frequencies of said oscillating member;(d) said stimulus applied to an asymmetrically positioned, and substantially adjacent to the boundary of said oscillating member, antinode of a normal mode pattern associated with a predetermined characteristic frequency high enough to satisfy the condition of said antinode being substantially adjacent to said boundary of said oscillating member;(e) said extreme position of said antinode giving rise to values of quality factor Q distributed asymmetrically with respect to the consequent extreme position of the oscillatory forces exerted by said stimulus on said oscillating member;(f) driving means for coupling said stimulus to said oscillating member by way of said asymmetrically positioned, and substantially adjacent to said boundary of said oscillating member, antinode, so that a substantially high effective density of normal modes and associated characteristic frequencies is derived from a substantially high number of concurrently excited normal modes;(g) said substantially high number of concurrently excited normal modes resulting from said stimulus being coupled to antinodes delimited by oscillating nodal lines crossing said antinode;(h) said oscillating nodal lines resulting from partial amplitude cancellations along expected positions of nodes associated with normal modes of oscillation concurrently excited by said stimulus;(i) said partial amplitude cancellations resulting from amplitude differentials of incident and reflected waves;(j) said amplitude differentials resulting from applying said stimulus at the extreme asymmetrical position of said antinode, and expected from said asymmetrically distributed quality factor Q of said oscillating member; and(k) means for attenuating effective output irregularities caused by said oscillating medium interacting with said ambient medium;whereby, a balanced energy distribution in the spectrum of the effective output will be derived from a high effective density of normal modes and from a simultaneous attenuation of irregularities caused by interaction of oscillating with ambient medium, so that said transducer will reproduce an improved approximation of said stimulus at source.