Patent ID: 7912234
Filing Date: 2011-03-22
Classification: G10K,H04R

Abstract:
1. A broadband sound generating and transmitting apparatus comprising: a primary reflector dish having a front concave reflecting surface which defines a forward radiant axis; a low frequency acoustical transducer located centered on the forward radiant axis and oriented to direct sound onto the front concave reflecting surface to reflect the sound forward about the forward radiant axis; an array of a plurality of higher frequency acoustical transducers, the plurality of higher frequency acoustical transducers being arranged radially about and spaced from the forward radiant axis and oriented outwardly from an apparent common source on the forward radiant axis to direct sound onto the front concave reflecting surface for reflection forward around the forward radiant axis; and a positionable framework supporting the low frequency acoustical transducer and the array of a plurality of higher frequency transducers in front of the primary reflector and providing for joint translation of the low frequency acoustical transducer and the array of a plurality of higher frequency transducers along the forward projection axis; an audio signal source for the low frequency acoustical transducer and the array of a plurality of higher frequency transducers responsive to the distance of the positionable framework from the primary reflector and frequency and phase of signals to be applied to the low frequency acoustical transducer and to the array of a plurality of higher frequency transducers to promote coherent summing of sound fields from the low frequency acoustical transducer and the plurality of higher frequency transducers.