Non-rotationally-symmetric surround-sound encoding system

Details Non-rotationally-symmetric surround-sound encoding system Non-rotationally-symmetric surround-sound encoding system

1977-03-11

1978-06-13

Olms, Douglas W.

1791001TD, H04R 500

Patent

active

040950492

ABSTRACT:
In a surround-sound encoding system which does not have full circular or square symmetry, a third channel is added to a basic two channel system in such a way that the third channel may be reduced in amplitude or restricted in frequency without substantially affecting important localization criteria. The encoder includes a phase-amplitude matrix such that a decoder having a phase-amplitude matrix which is the inverse of the encoder phase-amplitude matrix is such that the absence of the third channel signals at the input thereof does not affect localization in at least three, preferably six, predetermined directions.

REFERENCES:
patent: 3679832 (1972-07-01), Halpern
patent: 3814858 (1974-06-01), Parker
patent: 3824342 (1974-07-01), Christensen et al.
patent: 3906156 (1975-09-01), Cooper
patent: 3997725 (1976-12-01), Gerzon

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