Close Up (Mar-Dec 1931)

Record Details:

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312 CLOSE UP the reproducer, the " noise " from the photo-electric cell depends upon the amount of light reaching it. Thus, the problem is to reduce the light falling on the photo-electric cell as much as possible when small sounds are being reproduced, but proportionally to increase it for the reproduction of louder sounds. Western Electric accomplish this by recording a negative sound track which is very light in the silent portions, but which becomes much darker with the increase of sound intensity. Additional recording Negative print by Eric Gray. " Negatif" d" Eric Gray. Negaiiv, von Eric Gray. apparatus required consists of one amplifier and one noise-reduction-controlpanel. Gastone Frediani has invented a method of recording without photoelectric cells. The sound is photographed directly onto the edge of the film. The band of photographed images of sound is made of fine particles of silver possessing more or less electrical conductivity. The grid circuit of the first low-frequency amplifier is electrically connected with the film by means of a device of two electrical contacts, in the form of metal drums, placed at a certain distance from each other and electrically insulated. Since the film need not be transparent for the success of this system, it has been suggested that it be made of oil-cloth or paper. H. von Madaler has a system of recording mechanically, exactly like a gramophone record. Engraving is done in celluloid instead of wax. The record can be immediately replayed and reproduced 250 times without loss of quality. Another interesting, if irrelevant, idea in recording, is the multiple sound track reproduction on film of radio programmes. The length of film is limited to 128 feet with loops running continuously between two magazines. A revolution completed, the mechanism moves slightly across the face of the film so that an adjacent track can be recorded. (This may squirt PANIC into the gramophone business for operatic selections have been recorded in parallel tracks on 16 mm. films.) A 128 loop of normal stock