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Fig. 8. Complete 35mm unit.
synchronous in operation, and with suitable power supplies can be used on any power-line frequencies. The nonsynchronous feature is, of course of particular importance in connection with the NTSC color system. The rigid relationship required in present monochrome film transmission, namely the necessity for a line-driven synchronous motor for projector drive to achieve synchronism of film transport with deflection, has been removed. In compatible color television, where deflection frequencies are obtained by division from a crystal control master oscillator operating at the color-carrier frequency, the tremendous advantage of the nonsynchronous method of operation of the television film scanner is obvious.
(8) Operational advantages of special interest:
(a) Short run-up time: this is practically instantaneous.
(b) The scanner can also be used as a caption or title scanner. It can, moreover, be readily multiplexed with a second picture head and, if desired, with a slide-transparency unit. It is here that the use of a stationary scanning raster is of special importance, as previewing between two picture heads or between film and slides becomes readily feasible.
(c) It offers the possibility of perfect timing of start of film programs or film inserts in live programs, by remote control if desired.
The film scanner here described is the 35 mm scanner now in production for several networks and research laboratories. A 16mm version is currently in an advance stage of development but it should be emphasized that it will differ in many technical details from the 35mm version, while preserving the essential features and advantages.
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January 1954 Journal of the SMPTE Vol 62