==Referencer==
{{Reflist|refs=
<ref name="DSD">[https://denstoredanske.lex.dk/dolbysystem denstoredanske.lex.dk: Dolbysystem]</ref>
<ref name="world">[https://worldradiohistory.com/hd2/IDX-Audio/Archive-Stereo-Review-IDX/IDX/90s/Stereo-Review-1991-03-OCR-Page-0053.pdf worldradiohistory.com: Stereo Review 1991-03] Citat: "...Understanding Dolby S noise reduction....It is difficult to achieve high levels of noise reduction without audible artifacts. Dolby S was designed specifically to minimize such problems, as well as those that can arise from errors in the alignment of the tape deck or the noise reduction system, yet still provide greater noise reduction than Dolby B or Dolby C...Dolby Laboratories requires that recorders containing Dolby S circuitry conform to more stringent specications for head-azimuth alignment, head height, and [[wow og flutter|wow-and-flutter]] than it requires for Dolby B or Dolby C and that the decks provide increased headroom in their electronics and wider frequency response. These higher standards, combined with S-type noise reduction, amount to a significant advance in analog cassette technology....", [https://web.archive.org/web/20230314172308/https://worldradiohistory.com/hd2/IDX-Audio/Archive-Stereo-Review-IDX/IDX/90s/Stereo-Review-1991-03-OCR-Page-0053.pdf backup]</ref>
<ref name="White1996">White, Paul. Tape Noise Reduction. Sound on Sound, January 1996. [https://web.archive.org/web/20160604124004/http://www.soundonsound.com/sos/1996_articles/jan96/reducingnoise.html Archived at the Wayback Machine]</ref>
<ref name="JSJensen">{{cite web |title=Jørgen Selmer Jensen |url=http://jollyjokers.dk/index.php?option=com_content&task=view&id=2 |publisher=jollyjokers.dk |language=da |access-date=2020-11-09 |archive-url=https://archive.today/20130914071524/http://jollyjokers.dk/index.php?option=com_content&task=view&id=2 |archive-date=14. september 2013 |url-status=dead}}</ref>
<ref name="EP0046410">[https://www.freepatentsonline.com/EP0046410.html EP 0046410:  BIAS CONTROL METHOD AND APPARATUS FOR MAGNETIC RECORDING], [https://web.archive.org/web/20230314175217/https://www.freepatentsonline.com/EP0046410.html backup]</ref>
<ref name="Beocord9000">{{cite web |url=http://datamuseum.dk/wiki/B%26o/Beocord_9000 |title=B&O/Beocord 9000 - DDHFwiki |publisher=Datamuseum.dk |access-date=2020-11-09 |language=da |archive-date= 4. august 2021 |archive-url=https://web.archive.org/web/20210804182515/http://datamuseum.dk/wiki/B%26o/Beocord_9000 |url-status=dead }}</ref>
<ref name="HKTD4800">[https://www.hifiengine.com/manual_library/harman-kardon/td4800.shtml hifiengine.com 2021, Harman Kardon TD4800], retrieved 13 February 2021.</ref>
<ref name="HX_1981">{{cite magazine |title=Hi-Fi-Cassettenrekorder: Bessere Höhenaufzeichnung mit dem Dolby-HX-System |language=de |department=Produkt-Informationen |magazine=Funk-Technik - Fachzeitschrift für die gesamte Unterhaltungselektronik |issn=0016-2825 |publisher=Dr. Alfred Hüthig Verlag GmbH |publication-place=Heidelberg, Germany |date=august 1981 |volume=36 |issue=8 |pages=269–271 |url=https://nvhrbiblio.nl/biblio/tijdschrift/Funktechnik/1981/FT_1981_Heft_08_OCR.pdf |access-date=2021-07-10 |url-status=live |archive-url=https://web.archive.org/web/20210710212427/https://nvhrbiblio.nl/biblio/tijdschrift/Funktechnik/1981/FT_1981_Heft_08_OCR.pdf |archive-date=2021-07-10}} (3 pages)</ref>
}}
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