Space-mapping sound system

Details Space-mapping sound system Space-mapping sound system

1997-03-25

1999-01-05

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

381 22, 381 18, H04S 300

Patent

active

058570268

ABSTRACT:
A sound system is disclosed which, in common with earlier phase-amplitude multichannel "matrix" encode-decode systems, conveys or stores audio programs having multidirectional sound-source localization in a pair of audio-bandwidth channels, whether analog or digital. In the present invention, representation of a vertical, height dimension is added by mapping the "phase-amplitude sphere" representing signal separation onto a spatial hemisphere and by introducing to the parameters of phase difference and amplitude ratio a third parameter, decorrelation. Non-complementary matrices are used for encoding and decoding to provide improved separation between decoded signals. A radius-scaling function facilitates encoding of sound source locations outside, as well as within, the boundaries of the audience space defined by the peripheral and overhead loudspeaker locations.

REFERENCES:
patent: 3632886 (1972-01-01), Scheiber
patent: 3746792 (1973-07-01), Scheiber
patent: 3959590 (1976-05-01), Scheiber
patent: 4891839 (1990-01-01), Scheiber

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