Acoustic projection stereophonic system

Abstract

An acoustic projection system in which a reproducer array disposed in a listening chamber and operating in conjunction with a signal processor coupled to right and left channels carrying stereophonic signals, acts to project sound into the chamber in a manner substantially recreating the three-dimensional ambience of an original sound source composed of a central zone flanked by left and right zones. The processor extracts from the two channels a first power output derived from the sum of the right and left channel signals, a second power output derived from the difference between the left and right channel signals, and a third power output derived from the difference between the right and left channel signals. The array is constituted by a middle driver energized by the first output to radiate toward the front and rear of the listening chamber sounds representing all zones of the original sound source, a left driver energized by the second output to laterally radiate toward one side sounds representing the difference between the left and right zones, and a right driver energized by the third output to laterally radiate toward other side sounds representing the difference between the right and left zones whereby the resultant sound image to which a listener in the front area of the listening chamber is exposed includes sonic components which are time displaced with respect to the sonic components projected toward the front to provide spatial clues which impart a three-dimensional aspect to the reproduced sounds.