Low-frequency sound program generation

Details Low-frequency sound program generation Low-frequency sound program generation

1977-06-03

1978-08-29

Adams, Russell E.

Optics: motion pictures

With sound accompaniment

Methods

352 6, 352 7, 352 10, 352 25, 352 40, 352 85, G03B 3100

Patent

active

041100174

ABSTRACT:
There is disclosed a method for generating a low-frequency sound program for play during the performance of a motion picture film to produce a physical effect on the theater audience. Rather than to use random low-frequency noise or some other low-frequency source which is unrelated to the audible sound program, the low-frequency program is derived by shifting down in frequency a selected portion of the audible sound program. The final low-frequency program contains frequency components below 40 Hz, at least 50% of the total energy of which is derived from the shifted-down audible program. By so harmonically relating the audible and low-frequency programs, the audio/visual and vibrational sensations are perceived in a less disjointed fashion.

REFERENCES:
patent: 3973839 (1976-08-01), Stumpf
American Cinematographer, Jun. 1977, pp. 592-594t, 596t, 597t.

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