Valdemar Poulsen

Valdemar Poulsen (1869 - 1942) was a Danish engineer. In 1899, he developed a magnetic tape recorder.

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The magnetic recording was demonstrated in principle as early as 1898 by Valdemar Poulsen in his telegraphone. 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.

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Poulsen obtained a Telegraphone Patent in 1898. Poulsen developed an Arc Converter in 1908, referred to as the "Poulsen Arc Transmitter". A stamp was issued in honor of Poulsen in 1969.

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1869: 1869 is a common year starting on Friday (link will take you to calendar)....

1942: This article is about the year. For the 1984 Capcom arcade game, see 1942 (video game)....

Danish: Danish may refer to:...