Patent GB-1095512-A (GB)
IPC: G03D15/04
Abstract: 1,095,512. Splicing record films and tapes. D. W. R. BROWN. March 9, 1965 [March 11, 1964], No. 9827/65. Heading G5R. [Also in Division G2] The effect of splicing two film strips together is simultated by advancing a first strip to a selected position, advancing a second strip to a selected position, winding both strips backwards an equal number of frames from these two positions, and then advancing both strips again while the first film only is projected on to an inspection screen until the selected positions are reached, after which the second film only is projected on to the screen. Thus the effect of splicing the two films together at a particular point can be observed without actually making the splice. The same technique may be used for simultating splices in magnetic television tape. The two films 24, 24a (see also Fig. 1, not shown) are unwound from reels 25, 25a respectively, passed over a marking template 30 and then through optical and sound housings 28, 28a, being finally taken up on reels 32, 32a. If the accompanying sound tracks are on separate film or tape 35, 35a, these are similarly wound across from reels 36, 36a to reels 42, 42a. The films can be manually advanced frame by frame by means of cranks 45, 45a. The housings are shown in more detail in Fig. 3, and Fig. 4 (not shown). In housing 28, light from a source 61 is directed through the film 24 by means of various optical elements, and is finally reflected on to a viewing screen 14. An octagonal prism 66 rotates in synchronism with the movement of film 24 so as to produce a motion picture effect on the screen. The other housing 28a is similarly arranged, so that an image of film 24a is also projected on to screen 14. Solenoid-operated shutters 72, 72a can be interposed in the respective light paths, so that the image of either film 24 or film 24a may be received on the screen, with a rapid change-over from one to the other. Fig. 4 (not shown) illustrates the arrangements within housings 28, 28a for sound reproduction. If the film 24 has an optical sound track, this is reproduced by means of a light source (91) and a photo-electric cell (94). If there is a separate sound track 35, provision is made for both optical and magnetic types, i.e. a photo-cell (100) and a magnetic pick-up head (101). Films and sound tracks are all driven from shafts 76, 76a which are linked to electric motors (51, 51a, Fig. 5, not shown). Counting and control of film frame movements is effected by two pairs of discs 55, 57 and (55a, 57a), Figs. 5 (not shown), 6 and 7. All the discs have printed circuitry on their upper faces, that on the upper discs 57, (57a) being in the form of concentric circles. Each circle is contacted, by a brush on brush-carriers mounted above the upper discs. Each circle is also connected to a brush which protrudes from the under side of the upper disc, and in turn makes selective contact with a circuit on the upper face of the lower disc. Other brush contacts (e.g. 130, 130a etc., Fig. 5, not shown) make contact with circuits on the lower disc, so that a large number of electrical circuits may be controlled according to the relative positions of the upper and lower discs 57, 55. If it is desired that film 24 shall provide the first scene, shutter 72 is opened and shutter 72a is closed. The film is then run through the projector until the desired splicing point is reached, adjustment of the last few frames being made by hand using crank 45, until the last required frame of film 24 is reached. Then shutter 72 is closed and shutter 72a opened, the operator now viewing film 24a on the screen and determining which is to be the first frame. Instead of now actually splicing the two films together and trying out the effect, this is simulated by means of the apparatus of the invention. The films are now wound back a predetermined distance, and the simulation run begins. Shutters 72, 72a are controlled so that initially only film 24 is projected on to the screen. When the splicing position is reached, the shutter positions change automatically so that only film 24a is then projected on to the screen. Thus the effect of a splice in that particular position can be observed visually. At the same time the signal source for the loudspeakers 15, 16 is shifted from the sound track accompanying one film to that accompanying the other. If, after viewing the simulated splice, the operator wishes to try the effect of moving the splice point a frame or two either way, this can be effected by turning crank 170 or 170a (Fig. 1). The process continues until the operator is satisfied by the splice location, when it can then be marked (over an illuminated slit 161) for actual splicing. Another marking point 159 indicated the splice position for the sound media. Instead of an abrupt change at the splice, one scene may be faded into the other by modifying the printed circuits on lower discs 55, 55a (Fig. 8, not shown). Fig. 9 (not shown) is a circuit arrangement for effecting a simulated splice between two strips of magnetic television recording tape (221, 221a). After the splice point has been chosen, the video signals (with the proper splice) may be transferred to a third tape (223). The circuit of Fig. 9 is comprised largely of solid state components, so that two binary counters (225, 225a) can be used to replace discs 55, 55a, 57, 57a, to count and control the tape movements. The sound and vision corresponding to the tape is produced at a loud-speaker (272) and on a television screen (267).