Electrical audio signal processing systems and devices – Binaural and stereophonic – Pseudo stereophonic
Patent
1990-07-24
1992-03-10
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Pseudo stereophonic
H04S 500
Patent
active
050955071
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.
REFERENCES:
patent: 4706287 (1987-11-01), Blackmer et al.
Eslinger Lewis H.
Isen Forester W.
Maioli Jay H.
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