Signal processor for controlling low-frequency sound during...

Details Signal processor for controlling low-frequency sound during... Signal processor for controlling low-frequency sound during...

H - Electricity

04

R

181/2, 179/21

H04R 3/00 (2006.01) G03B 29/00 (2006.01) G03B 31/02 (2006.01)

Patent

CA 1095431

Abstract of the Disclosure There is disclosed a system for controlling the generation of low-frequency sound in a motion picture theater, together with the conventional audible sound, in accordance with an input electrical signal derived from the sound track of a motion picture film. In the prior art, the low-frequency amplifiers were operated in accordance with control signals recorded on the film; spurious control signals could falsely operate these amplifiers. In the invention, low-frequency ampli- fication is provided only when the low-frequency program information signal itself exceeds a threshold level, thus completely guarding against false operation. Additional features of the invention include the provision of an adjustable dynamic response for the low-frequency signal path, adjustable attack and release times for the low- frequency pre-amplifier, lamps for automatically indi- cating the source of a malfunction, and test generators which facilitate a theater installation without the need for excessive play of a test film.

304415

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