The phonograph, in its later forms also called a gramophone or record player, is a device introduced in 1877 for the mechanical recording and reproduction of sound. The sound vibration waveforms are recorded as corresponding physical deviations of a groove engraved or impressed into the surface of a rotating cylinder or disc. To recreate the sound, the surface is similarly rotated while a playback stylus traces the groove and is therefore vibrated by it, very faintly reproducing the recorded sound. In early acoustic phonographs, the stylus vibrated a diaphragm which produced sound waves which were coupled to the open air through a flaring horn, or directly to the listener's ears through stethoscope-type earphones. In later electric phonographs, the motions of the stylus are converted into an analogous electrical signal by a transducer called a pickup or cartridge, electronically amplified, then converted back into sound by a loudspeaker.
October 13th, 2014
Viewed 736 Times - Last Visitor from Beverly Hills, CA on 12/14/2019 at 9:15 AM