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BS 5550-3.4.9:1987 Cinematography. 35 mm film. Sound. Specification for reproduction characteristics of the A-chain frequency response for 35 mm photographic sound
standard by BSI Group, 04/30/1987
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A-chain frequency response characteristic in motion-picture control rooms and indoor theatres.Cross References:
BS 5550:Subsection 5.4.2
BS 5550:Subsection 7.4.1