MP3: Difference between revisions

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During the development of the MUSICAM encoding software, Stoll and Dehery's team made thorough use of a set of high-quality audio assessment material<ref>{{cite book | url = https://tech.ebu.ch/publications/sqamcd | title = EBU SQAM CD Sound Quality Assessment Material recordings for subjective tests | date = 2008-10-07 }}</ref> selected by a group of audio professionals from the European Broadcasting Union, and later used as a reference for the assessment of music compression codecs. The subband coding technique was found to be efficient, not only for the perceptual coding of high-quality sound materials but especially for the encoding of critical percussive sound materials (drums, [[triangle (musical instrument)|triangle]],...), due to the specific temporal masking effect of the MUSICAM sub-band filterbank (this advantage being a specific feature of short transform coding techniques).
 
As a doctoral student at Germany's [[University of Erlangen-Nuremberg]], [[Karlheinz Brandenburg]] began working on digital music compression in the early 1980s, focusing on how people perceive music. He completed his doctoral work in 1989.<ref name="BusinessWeek_2007" /> MP3 is directly descended from OCF and PXFM, representing the outcome of the collaboration of Brandenburg — working as a postdoctoral researcher at AT&T-Bell Labs with James D. Johnston ("JJ") of AT&T-Bell Labs — with the [[Fraunhofer Society|Fraunhofer Institute for Integrated Circuits]], Erlangen (where he worked with [[Bernhard Grill]] and four other researchers – "The Original Six"<ref>{{Cite book|title=How Music Got Free: The End of an Industry, the Turn of the Century, and the Patient Zero of Piracy|last=Witt|first=Stephen|publisher=Penguin Books|year=2016|isbn=978-0-14-310934-1|location=United States of America|page=13|quote=Brandenburg and Grill were joined by four other Fraunhofer researchers. Heinz Gerhauser oversaw the institute´s audio research group; [[Harald Popp]] was a hardware specialist; Ernst Eberlein was a signal processing expert; Jurgen Herre was another graduate student whose mathematical prowess rivaled Brandenburg´s own. In later years this group would refer to themselves as "the original six".}}</ref>), with relatively minor contributions from the MP2 branch of psychoacoustic sub-band coders. In 1990, Brandenburg became an assistant professor at Erlangen-Nuremberg. While there, he continued to work on music compression with scientists at the [[Fraunhofer Society]]'s [[Fraunhofer Institute for Telecommunications|Heinrich Herz Institute]]. In 1993, he joined the staff of Fraunhofer HHI.<ref name="BusinessWeek_2007" /> An acapella version of the song "[[Tom's Diner]]" by [[Suzanne Vega]] was the first song used by Karlheinz Brandenburg to develop the MP3 format. It was used as a benchmark to see how well MP3's compression algorithm handled the human voice. Brandenburg adopted the song for testing purposes, listening to it again and again each time he refined the compression algorithm, making sure it did not adversely affect the reproduction of Vega's voice.<ref name="Sterne2012_Vega" /> Accordingly, he dubbed Vega the "Mother of MP3".<ref name="motherofmp3" /> Instrumental music had been easier to compress, but Vega's voice sounded unnatural and strange in early versions of the fileformat. KarlheinzBrandenburg eventually gotmet to meet SuzanneVega and heard Tom's Diner performed live.
 
=== Standardization ===