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發表於 2020-2-19 12:50:31
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Enter the SMARTractor
In 1938, there were only monophonic shellac discs that spun at a high-resolution–friendly 78rpm, and whose jumbo grooves—more than twice as wide as an LP's microgroove—were, in some instances, modulated to within a few millimeters of the paper label. Before the microgroove LP, which Columbia Records introduced in 1948, classical record producers had no choice but to stretch a single movement across multiple sides or even multiple discs; in fact, before 1947, during the era when all commercial recordings were made direct-to-disc, producers and engineers got pretty good at it. (The art of acoustic orchestral fade-ins and fade-outs is now surely lost to us.)
The discrepancy of using a 78rpm-era phono-alignment scheme to optimize the sound of 331/3rpm stereophonic microgroove LPs did not go unnoticed by Dietrich Brakemeier, of the German firm Acoustical Systems (footnote 4). Beginning in 2010, Brakemeier set about creating a new alignment scheme tailored specifically to stereo microgroove LPs. The result of his work is a curve he calls UNI-DIN, the first three letters of the name being derived from universal, the last three standing for Deutsches Institut für Normung (German Institute for Standardization), one of the organizations that establishes, among other things, the standard characteristics of commercial LPs.
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