Instrument for reproducing sounds. A phonograph record stores a copy of sound waves as a series of undulations in a wavy groove inscribed on its rotating surface by the recording stylus. When the record is played back, another stylus (needle) responds to the undulations, and its motions are then reconverted into sound. Its invention is generally credited to Thomas Alva Edison (1877). Stereophonic systems, with two separate channels of information in a single groove, became a commercial reality in 1958. All modern phonograph systems had certain components in common: a turntable that rotated the record; a stylus that tracked a groove in the record; a pickup that converted the mechanical movements of the stylus into electrical impulses; an amplifier that intensified these electrical impulses; and a loudspeaker that converted the amplified signals back into sound. Phonographs and records were the chief means of reproducing recorded sound at home until the 1980s, when they were largely replaced by recorded cassettes (see tape recorder) and compact discs.
Learn more about phonograph with a free trial on Britannica.com.
Record or The Record may mean:
An item or collection of data:
Records Management & Compliance: Making the Connection: Organizations Must Take a Proactive and Holistic Approach to Compliance That Ensures the Business, Technological, and Legal Challenges of Records Management Are Addressed
May 01, 2004; At the Core This article * discusses the importance of a records management program to an organization * defines the...