Abstract: The CPS (center point stereo) system of the present invention is directed to stereo sound reinforcement of live music, particularly with electronically-implemented instruments such as guitars and keyboards that provide a musical source signal at line level. A special CPS processor, converting regular left and right stereo signals to sum and difference signals, enables a center stage acoustic image to be created directly from a forward-directed loudspeaker unit driven from the sum signal and enables left and right spatialized stereo images to be created by recombination with a difference field received indirectly from a sideways-directed special dipole loudspeaker unit conveniently co-located with the forward-directed loudspeaker unit and driven from the difference signal. The CPS processor receives L and R input from the instrument or from an interposed FX (musical effects) or DSP (digital sound process) unit receiving mono or stereo input from the instrument.

Abstract: A stereo speaker system for portable computers which maximizes spatial impression by using rearward-firing speakers, mounted in the back of the display, in combination with forward-firing speakers mounted on the chassis or in the front side of the display.

Abstract: A computer including an extraction unit for extracting source signals of surround sound from data received via a medium, and a processor for decoding and converting the source signals into audio signals of a plurality of channels. The processor includes the function of correction a sound field of a plurality of speakers which are arranged approximately concentrically together with a display unit about an operating position of a user operating the computer.

Abstract: A surround sound converter for home audio systems includes outputs for a left front speaker, a right front speaker, a left rear speaker, a right rear speaker, and an auxiliary output to accommodate a rear auxiliary amplifier. The surround sound converter also includes an input for the left and right channel speaker output of an amplifier, a receiver, or any stereo signal device which has an audio amplifier. At least one potentiometer controls the volume balance between the front and rear speakers. A left and right capacitor are used to drive the left and right rear speakers, respectively. An auxiliary output is provided to accommodate adding a rear auxiliary amplifier. A surround sound converter for vehicle audio systems utilizes an automotive stereo. A left front speaker and right front speaker are connected to the normal speaker outputs of the automotive stereo. The left rear speaker is connected to the left rear signal negative and the right rear signal negative.