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History
Direct metal mastering
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Direct metal mastering (DMM) is an analog audio disc mastering technique jointly developed by two German companies, Telefunken-Decca (Teldec) and Georg Neumann GmbH, toward the end of the 20th century after having seen the same technology used by RCA Princeton Labs for its SelectaVision videodiscs in the late-1970s.
DMM copper disc sitting on the turntable of a Neumann AM32 lacquer cutting lathe, built in the 1930s
DMM copper disc sitting on the turntable of a Neumann AM32 lacquer cutting lathe, built in the 1930s
Teldec
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Teldec is a German record label in Hamburg, Germany. Today the label is a property of Warner Music Group.
Design prototype of a player for the Telefunken TeD video disc
Design prototype of a player for the Telefunken TeD video disc