Editing Tape recorder (section)

=== Magnetic recording ===
[[Magnetic recording]] was conceived as early as 1878 by the American engineer [[Oberlin Smith]]<ref>Engel, Friedrich Karl, ed. (2006) "Oberlin Smith and the invention of magnetic sound recording:  An appreciation on the 150th anniversary of the inventor's birth".  Smith's caveat of 4 October 1878 regarding the recording of sound on magnetic media appears on pp. 14–16.  Available at:  [http://www.richardhess.com/tape/history/Engel--Oberlin_Smith_2006.pdf RichardHess.com] {{webarchive |url=https://web.archive.org/web/20061021075340/http://www.richardhess.com/tape/history/Engel--Oberlin_Smith_2006.pdf |date=21 October 2006 }}</ref><ref>Smith, Oberlin (1888 September 8) [https://books.google.com/books?id=zYVMAAAAYAAJ&pg=RA3-PA116 "Some possible forms of phonograph,"] ''The Electrical World'', '''12''' (10) :  116–117.</ref> and demonstrated in practice in 1898 by Danish engineer [[Valdemar Poulsen]].<ref>{{cite web |last1=Poulsen |first1=Valdemar |url=http://pdfpiw.uspto.gov/.piw?Docid=00661619&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect2%3DPTO1%2526Sect2%3DHITOFF%2526p%3D1%2526u%3D%2Fnetahtml%2FPTO%2Fsearch-bool.html%2526r%3D1%2526f%3DG%2526l%3D50%2526d%3DPALL%2526S1%3D0661619.PN.%2526OS%3DPN%2F661619%2526RS%3DPN%2F661619&PageNum=&Rtype=&SectionNum=&idkey=NONE&Input=View+first+page |title=Method of recording and reproducing sounds or signals|id=No. 661,619 |orig-date=July 8, 1899 |date= November 13, 1900 |website=United States Patent and Trademark Office Patent Images |url-status=dead |archive-url= https://web.archive.org/web/20190115234516/http://pdfpiw.uspto.gov/.piw?Docid=00661619&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect2%3DPTO1%2526Sect2%3DHITOFF%2526p%3D1%2526u%3D%2Fnetahtml%2FPTO%2Fsearch-bool.html%2526r%3D1%2526f%3DG%2526l%3D50%2526d%3DPALL%2526S1%3D0661619.PN.%2526OS%3DPN%2F661619%2526RS%3DPN%2F661619&PageNum=&Rtype=&SectionNum=&idkey=NONE&Input=View+first+page |archive-date= Jan 15, 2019 }}</ref><ref name="Nagra">{{cite web |title=Magnetic Recording Timeline |website=ACMI  |archive-url=https://webarchive.nla.gov.au/awa/20040302130000/http://pandora.nla.gov.au/pan/13071/20040303-0000/www.acmi.net.au/AIC/HIST_REC_NAGRA.html |archive-date=2004-03-02 |url=http://www.acmi.net.au/AIC/HIST_REC_NAGRA.html |author=Nagra Company}}{{cbignore|bot=medic}}</ref> Analog 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 to be [[Amplifier|amplified]] and played back through a [[loudspeaker]].