Abstract: A changing apparatus for compact discs has a box-shaped magazine in which discs are stored in parallel, overlapping, sloped compartments. The discs can be moved from a storage position in the magazine to a playback position on a playback mechanism by a disc transfer mechanism. The disc transfer mechanism can include a spring-operated lever for pushing a disc out of the magazine. Alternatively, it may include a flexible ribbon housed inside a hollow sheath. When the ribbon is moved back and forth in the sheath, the disc is pushed in a desired direction by one of the ends of the ribbon.

Abstract: An apparatus and method for reproducing sound recordings on blank films and tapes of plastic materials in which a continuous master film carrying sinuous lines of imprint containing the sound recordings to be reproduced are pressed against a blank tape as both the master film and blank tape are moved continuously at a constant speed and in synchronism past a pressure applying station. A laser is provided to emit a very fine and precise laser heat beam to heat and soften local zones of the blank tape a fraction of a second before being aligned to receive the imprints.

Abstract: Mobile refractive optical members are placed in a device between the film and stereoscopic direct viewing windows. A drive is provided for driving the film strip bearing stereoscopic images and the mobile refractive optical members at a uniformly constant speed and in synchronism across the fields of view of the viewing windows to provide a fixed image in each window despite the motion of the film; the film strip has a sound track which may be reproduced by conventional reproduction equipment since the film strip is driven at a constant speed.