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{{notability|1=Biographies|date=August 2021}}

{{Short description|American sound engineer}}'''Howard Allen (Hal) Chamberlin, Jr.''' is an American [[audio engineer]], writer and long distance [[cyclist]] from [[North Carolina]], most widely known as the author of the book ''Musical Applications of Microprocessors''. 

== Biography ==
In the 1970s while still at school he built an [[Analog signal|analog]] [[Synthesizer|electronic music synthesizer]] and then a [[Homebuilt computer|16 bit computer]] from surplus [[IBM 1620]] [[Magnetic-core memory|core memories]] to control it.<ref>''[http://tech-insider.org/personal-computers/research/acrobat/7807.pdf The First Ten Years of Amateur Computing]'' by Sol Libes, Byte magazine, July 1978</ref><ref name="acs">''[https://archive.computerhistory.org/resources/access/text/2012/03/102654910-05-01-acc.pdf Hal Chamberlin's Computer]'' ACS Newsletter, Volume III, Number 2, September 1972</ref>

He was awarded an [[Master of Science|MSc]] in [[Telecommunications engineering|Communication Engineering]] from [[North Carolina State University|NCSU]] in 1973. The subject of his [[thesis]] was the design of a [[Digital signal|digital]] music synthesizer utilising an [[Electric organ|organ]] keyboard and a [[Tektronix]] 453 [[oscilloscope]] for a [[Computer monitor|graphics display]].<ref name="acs"/>

In November 1974 together with others began ''The Computer Hobbyist'' magazine.<ref>''Fire in the Valley: The Making of The Personal Computer'' by Paul Freiberger, Michael Swaine, Pragmatic Bookshelf, 3rd edition, 30 Oct. 2014, {{ISBN|1937785769}}</ref>

In 1977 he first published [[wavetable synthesis]] in [[Byte (magazine)|Byte]]'s September 1977 issue<ref>[http://retro.hansotten.nl/uploads/files/computer_performance_music-byte-september-1977.pdf ''A sampling of techniques for computer performance of music''] by Hal Chamberlin, Byte, September 1977</ref> and together with David B. Cox started Micro Technology Unlimited.<ref name="mtu">[https://web.archive.org/web/20181002204146/http://www.mtu.com/support/mtufounders.htm MTU Founders in Digital Audio Workstations]</ref> At Micro Technology Unlimited, in 1981, he designed the [[MOS Technology 6502|6502]]-based MTU-130/140 microcomputer<ref>[https://www.atarimagazines.com/compute/issue19/MTU-130_New_6502_Microcomputer.php Compute!], Issue 19, December 1981, p. 72</ref> and the Digisound-16 an early [[Digital-to-analog converter|digital to analog converter]].

His seminal book ''Musical Applications of Microprocessors'' was first published in 1979.<ref name="mtu"/><ref>[http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=ELECTRONICS/acknowledgements.html&CATPARTNO=&PN=1&SONGID=NONE Acknowledgements] {{Webarchive|url=https://web.archive.org/web/20210709184333/http://musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=ELECTRONICS/acknowledgements.html&CATPARTNO=&PN=1&SONGID=NONE |date=2021-07-09 }}, Music From Outer Space website</ref><ref name="kurz">''[https://www.kurzweilai.net/kurzweil-music-story-it-all-started-with-ray The Kurzweil Music story: It all started with Ray]'', Kurzweil Music Systems, 25 January 2012</ref>

In 1986 he left MTU to work for [[Kurzweil Music Systems]] where he remained in one engineering role or another until retirement in 2014.<ref name="mtu"/><ref name="kurz"/> While there amongst other projects he designed the [[Kurzweil Music Systems#K150_synthesizer|Kurzweil K150]]<ref>[https://kurzweil.com/content/migration/downloads/pub/Kurzweil/PRODHIST.TXT Product information and history], December 2000</ref>

In 1992 he moved to [[Boston]].<ref>[https://www.krwg.org/post/meet-members-tour Meet the Members of the Tour], KRWG, 2004</ref>

== See also ==
* [[Homebrew Computer Club]]
* [[AIM-65]]

== References ==
{{reflist}}
{{Authority control}}
== Further reading ==
* ''Musical Applications of Microprocessors'' by Hal Chamberlin, Hayden Book Co., 1980, {{ISBN|0810457539}}
* ''Musical Applications of Microprocessor'' by Hal Chamberlin, 2nd ed., Sams, 1985, {{ISBN|0810457687}}

== External links ==
* [https://web.archive.org/web/20080524162018/http://interview.sonikmatter.com/data/hal_chamberlin.php Hal Chamberlin Interview] by Brian Cowell, Sonikmatter, Jan 2002. (archived)
* [https://archive.org/search.php?query=%22hal+chamberlin%22&sin=TXT "Hal Chamberlin" in text] search at Archive.org
* [https://www.pestingers.net/pdfs/other-computers/the-computer-hobbyist.pdf The Computer Hobbyist]
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