Magnetic recording
Magnetic recording was conceived of as early as 1877 by Oberlin Smith and demonstrated in practice in 1898 by Valdemar Poulsen. Magnetic wire recording, and its successor, magnetic tape recording, involve the use of a magnetizable medium which moves with a constant speed past a recording head. An electrical signal, which is analogous to the sound that is to be recorded, is fed to the recording head, inducing a pattern of magnetization similar to the signal. A playback head can then pick up the changes in magnetic field from the tape and convert it into an electrical signal.
In the audio tapes and discs section you can find blank audio media such as CDs and audio tapes and cassettes.
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