Valdemar Poulsen
Valdemar Poulsen
1869-1942
Danish engineer who invented the telegraphone, the first practical device for recording and replaying sound—the forerunner of modern audio and video recording systems. Poulsen developed the telegraphone, an electromagnetic phonograph that could record and reproduce human speech on a steel wire, while employed with the Copenhagen Telephone Company. In 1903 he founded the American Telegraphone Company to market his invention, which by then was able to record for 30 continuous minutes. That same year he patented arc wireless transmission, a modification of Englishman William Duddell's "singing arc," which could generate continuous audio waves and paved the way for radio broadcasting.
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Phonograph , Phonograph
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The first practical device for recording and reproducing sound was developed by American inventor Thomas Alva Edison (1847–1931)… Record Player , record player or phonograph, device for reproducing sound that has been recorded as a spiral, undulating groove on a disk. This disk is known as a ph… Becton, Dickinson & Company , bec (Fr.), becco (It.). Mouthpiece of cl. flûte à bec is Fr. for recorder.
bec. because Telephone Recording System , Telephone Recording System
A telephone recording system can be as simple as a handheld phone receiver with an analogue (non-computerized, non-digital… Record , rec·ord • n. / ˈrekərd/ 1. a thing constituting a piece of evidence about the past, esp. an account of an act or occurrence kept in writing or some o… Recorder , re·cord·er / riˈkôrdər/ • n. 1. an apparatus for recording sound, pictures, or data, esp. a tape recorder. 2. a person who keeps records: a poet and…
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Valdemar Poulsen