Tape Recording

Recording sound by means of magnetic tape. Valdemar Poulsen in Denmark discovered the basic principles in the 1890s, recording on megnetized wire. Tape recordings are done on plastic tape coated with magnetic iron oxide or chromium oxide partocles. In recording, sounds are converted by a microphone into variable electrical signals. These are then fed through the coils of an electromagnet and cause its magnetism to fluctuate in sympathy.

This fluctuating magnetism is recorded as an invisible pattern on magnetic tape moving past the electromagnet and induces in it variable electrical signals. These mimic the original signals produced by the microphone and are fed through a loudspeaker to reproduce the original sounds. In video tape recording, signals from a television camera are recorded on magnetic tape, and are played back through a television receiver to reproduce pictures..........

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