phonograph record

A monaural phonograph record makes use of a spiral 90° V-shaped groove impressed into a plastic disc. As the record revolves at 33 1/3 rotations per minute, a tiny “needle,” or stylus, simultaneously moves along the groove and vibrates back and forth parallel to the surface…

…70 decibels on the best phonograph discs, thus accounting for the distinct, clear sound obtained from even the cheapest CD players. Nevertheless, some audiophiles maintain that the best phonograph recordings stamped on polyvinyl chloride (or “vinyl”) discs deliver subtle musical overtones that are almost invariably lost in the digitization process.

…1/3 revolutions-per-minute (rpm) long-playing (LP) phonograph record, which revolutionized the recording industry. Goldmark joined the Columbia Broadcasting System (CBS) Laboratories in 1936. There he began work on a colour-television system that was first demonstrated in 1940. Based on the use of a rotating, three-colour disk, his field-sequential system was improved…

phonograph record, invented by Thomas A. Edison in 1877. The sound to be recorded was focused by a horn onto a diaphragm, causing it to vibrate; the vibrations were transmitted to a stylus and modulated its motion as it followed a helical path along the…

…with recording on a phonograph disc and developed a 16-inch (40.6-centimeter) disc rotated at 33 1/3 revolutions per minute; they improved loudspeakers, introduced the moving-coil type of speaker, and generally improved the entire electronic amplification system. The Warner Bros. movie studio became interested in all these developments and formed…

…is the sound from a phonograph record, which always contains some extraneous sound from the surface of the recording groove even when the record is new. The noise becomes more pronounced with wear. Contrast this with the sound from a digital compact disc recording. No sound is heard that was…

Radio broadcasting exploited the phonograph record as a means of preserving sound; in a similar way, television drew upon the film. The invention of magnetic tape for recording both sound and video signals has now linked together all of the mechanized media—phonograph, telephone, radio, sound film, and television—and made…

…rotating platform that carries a phonograph record. Turntables commonly revolve at 16 2/3, 33 1/3, 45, or 78 revolutions per minute; many record players have gearing that allows the user to choose among these speeds. For best sound reproduction, constant turning speed is crucial; transcription turntables used by radio stations…