as a test i ran an audio file through audacity. audacity allows you to change the speed of the audio file with instant clicks at 33, 45, and 78 rpm. i increased the speed of the audio file to 78 rpm, recorded it at 78 then played it back at 33. excellent results with a virtually noiseless groove. this was the first test but it works quite well...
THEVICTROLAGUY@GMAIL.COM
INTERESTING EXPERIMENT / 78 RPM TO 33 RPM
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THEVICTROLAGUY
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INTERESTING EXPERIMENT / 78 RPM TO 33 RPM
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Re: INTERESTING EXPERIMENT / 78 RPM TO 33 RPM
Hi,
That seems backwards from what is normally done. If you take a file with a 20Khz bandwidth and play that file back at 78 the 2.3X speed change will shift the top frequencies to 46Khz. The cutter head can only cut to 10-15 Khz before rolling off, so your bandwidth will be limited to 4 -6Khz once you playback at 33. If you don't mind the lower fidelity, the good news is the cut goes much faster.
Mark
That seems backwards from what is normally done. If you take a file with a 20Khz bandwidth and play that file back at 78 the 2.3X speed change will shift the top frequencies to 46Khz. The cutter head can only cut to 10-15 Khz before rolling off, so your bandwidth will be limited to 4 -6Khz once you playback at 33. If you don't mind the lower fidelity, the good news is the cut goes much faster.
Mark