magnetic recorder

magnetic recording

noun
the process of recording sound or other data on magnetic tape, wire, etc.

Origin:
1940–45

magnetic recorder, noun
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American Heritage
Science Dictionary
magnetic recording  
The recording of a signal, such as sound or computer instructions, in the form of a magnetic pattern on a magnetizable surface, such as tape or a disk coated with metal oxides. In the recording process, small electromagnets are used to convert an electrical signal into a magnetic one that magnetizes that surface. The value of the signal at any given point corresponds to the degree and polarity of magnetization of the surface at a corresponding point. During playback, the opposite process occurs, and the magnetic fields along the surface are converted into electrical signals for further processing.
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