Sound Recording

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  • Video: Library Of Congress Preserves Historic CBS Radio Recordings

    cbs.com 1 week ago

    Every year, the Library of Congress designates 25 sound recordings and preserves the best available copy for future generations. Scott Pelley reports one of the inductees this year includes a seven-disc set from CBS News producer Fred Friendly of radio broadcasts narrated by Edward R. Murrow from FDR's inauguration in 1933 to the end of World War II in 1945.

  • Library Of Congress Names New Entries For National Recording Registry

    latimes.com 1 week, 1 day ago

    Donna Summer's throbbing 1977 hit "I Feel Love"; Prince's 1984 "Purple Rain" album; the first known commercial sound recording, dating to 1888; the Sugar Hill Gang's watershed rap record "Rapper's Delight"; and 1930s and '40s news reports and speech excerpts from journalist Edward R. Murrow's "I Can Hear It Now" radio program are among 25 sound recordings newly enshrined in the Library of Congress' National Recording Registry, library officials announced Wednesday. Among the other new entries are Dolly Part

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Sound recording and reproduction is an electrical or mechanical inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording. Acoustic analog recording is achieved by a small microphone diaphragm that can detect changes in atmospheric pressure and record them as a graphic representation of the sound waves on a medium such as a phonograph. In magnetic tape recording, the sound waves vibrate the microphone diaphragm and are converted into a varying electric current, which is then converted to a varying magnetic field by an electromagnet, which makes a representation of the sound as magnetized areas on a plastic tape with a magnetic coating on it. Analog sound reproduction is the reverse process, with a bigger loudspeaker diaphragm causing changes to atmospheric pressure to form acoustic sound waves. Electronically generated sound waves may also be recorded directly from devices such as an electric guitar pickup or a synthesizer, without the use of acoustics in the recording process other than the need for musicians to hear how well they are playing during recording sessions.
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