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Abstract

In a sound image placement system, which provides sound image placement by processing a monaural input signal to produce two signals that have a phase and amplitude differential therebetween on a frequency dependent basis and that are fed to respective loudspeakers, an off-axis listening location can be obtained by producing an incoherent multiple of the monaural input signal, processing the incoherent signal to produce two signals with a different phase shift and amplitude alteration differential and then adding these two signals to the two signals produced from the original monaural input signal. The combined signals are played back simultaneously through the two loudspeakers. Each incoherent multiple of the monaural input signal can be processed to provide a different off-axis listening locale relative to a center axis of the two loudspeakers, with each off-axis listening locale resulting in the same sound image placement. Even though multiple signals are fed simultaneously to the two loudspeakers, by reason of their mutual incoherence the listener does not perceive any sound anomalies.

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First Claim