Journal of the Society of Motion Picture Engineers (1930-1949)

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+ 15 + 10 + 5 0 -5 -10 1 RECORDING FREQUENCY CHARACTERISTIC PHOTOGRAPHIC CHANNEL ,** *— \ 00 1000 K>00< FREQUENCY IN CYCLES PER SECOND Fig. 5. Photo channel frequency characteristic. +20 +15 CD 0+10 +•5 CALIBRATING FREQUENCY FILM A -CONSTANT VELOCITY 6DB/ OCTAVE BCONSTANT CURRENT INPUT C HALF LOSS CURVE DDESIRED EQUALIZATION 10+ 1000 FREQUENCY IN CYCLES PER SECOND Fig. 6. Magnetic calibrating frequency film. 10000 +15 g+IO Z+5 2 -5 -10 RECORDING FREQUENCY CHARACTERISTIC MAGNETIC CHANNEL s s x / " ••• — , — __ — — ' • .-^•-^ *^ X* 00 1000 IOOOC FREQUENCY IN CYCLES PER SECOND Fig. 7. Magnetic-channel frequency characteristic. Frayne and Livadary: Photomagnetic Recording 393