RP 90:2004 RP 90:2004 SMPTE 推荐做法 16 毫米音频再现器的 U 型音频电平和多频测试胶片规范,磁性类型
RP 90:2004 - SMPTE Recommended Practice - Specifications for Type U Audio Level and Multifrequency Test Film for 16-mm Audio Reproducers, Magnetic Type
(1.1) This practice specifies a type U audio frequency test film to be used for adjusting the mechanical and electrical parameters of 16-mm motion-picture magnetic audio reproducers operating at 24 frames per second. — NOTE – The film velocity of 16-mm film is also commonly stated as 7.2 inches per second or 183 millimeters per second, and historically stated as 36 feet or 11 meters per minute. (1...