Monaural and stereo compatible multidirectional sound matrixing

Details Monaural and stereo compatible multidirectional sound matrixing Monaural and stereo compatible multidirectional sound matrixing

1975-05-16

1976-07-20

Olms, Douglas W.

179 15BT, 1791004ST, H04R 500

Patent

active

039707881

ABSTRACT:
Multidirectional source signals which are encoded in two monaural and stereo-compatible transmission channels with predetermined amplitude and phase relations indicative of source directions and adapted to be decoded for formation of more than two loudspeaker presentation signals having source signals corresponding to every source direction appearing in a plurality of such presentation signals, but in differing relative amplitude, are decoded with at least one auxiliary channel. The auxiliary channels have the source signals encoded therein with amplitude and phase relations differently indicative of source directions, and the decode of the two mono and stereo compatible channels is combined with the decode of the auxiliary channels to produce presentation signals with sharpened directionality. Also disclosed are limited-frequency auxiliary channels.

REFERENCES:
patent: 3679832 (1972-07-01), Halpern
patent: 3708623 (1973-01-01), Dorren
patent: 3754099 (1973-08-01), Takaoka
patent: 3761628 (1973-09-01), Bauer
patent: 3814858 (1974-06-01), Parker
patent: 3824342 (1974-07-01), Christensen et al.
"Multichannel Stereo Matrix Systems: An Overview," by Eargle in Journal of Audio Engr. Soc., July-Aug. 1971, vol. 19, No. 7.
"On the Processing of Two- and Three-Channel Program Material for Four-Channel Playback," by Eargle in Journal of the Audio Eng. Society, Apr. 1971, vol. 19, No. 4, pp. 262-266.
"Further Improvements in the Discrete Four-Channel Disc System CD-4," by Owaki et al., in Journal of Audio Eng. Society, June 1972, vol. 20, No. 5, pp. 361-369.

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