Signal matrixing for directional reproduction of sound

Details Signal matrixing for directional reproduction of sound Signal matrixing for directional reproduction of sound

1976-07-19

1980-11-25

Olms, Douglas W.

179 1GH, 1791004ST, H04R 500

Patent

active

042360390

ABSTRACT:
Multidirectional sound signals are optimally matrixed to increase the psychoacoustic directional fidelity as compared with prior systems. Four (or more) azimuthally spaced loudspeakers are fed from two transmission channels with very satisfactory directional sensing accuracy and full compatibility with conventional single-channel and two-channel reproduction equipment. Further auxiliary transmission channels may be added to produce a form of discrete-channel capability having even greater azimuthai fidelity than obtained in speaker-identifed channels, while at the same time maintaining compatibility both with conventional reproducing equipment and with equipment for the basic two-channel transmission of the invention. The auxiliary channels may be transmitted in a relatively narrow frequency range, thus reducing the total bandwidth requirement for recording or broadcasting as compared with full conventional discrete channels.

REFERENCES:
patent: 3679832 (1972-07-01), Halpern
patent: 3708523 (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.
patent: 3970788 (1976-07-01), Cooper
"Multichannel Stereo Matrix Systems", by Eargle in Journal of Audio Engr. Soc., Jul.-Aug. 1971, vol. 19, No. 7.
"On the Processing of Two-and Three-Channel . . . ", by Eargle in Journal of Audio Engr. Soc., Apr. 1971, vol. 19, No. 4, pp. 262-266.
"Further Improvements in Discrete Four-Channel . . . " by Owaki et al, in Journal of Audio Engr. Soc., Jun. 1972, vol. 20, No. 5, pp. 361-369.

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