Re:Digital Needle: Ripping vinyl records with a scanner (2013)
by marcodiego on Monday April 26, 2021 @02:47PM
(#26946375)
Thinking about a simpler system... how about getting a camera on a turntable recording a video while the record turns. It would then be possible to track a line with an specified width in the video and turn the changes in a piece of this line it into a waveform.
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Re:Digital Needle: Ripping vinyl records with a scanner (2013)
by porterde on Monday April 26, 2021 @04:38PM
(#26947777)
Also capture the audio sample from the same record alongside the video. Repeat with lots of records. Train a model to predict the audio from the video. Voila! Play records with just the camera “stylus”...
Re:Digital Needle: Ripping vinyl records with a scanner (2013)
by 3dee on Monday April 26, 2021 @05:45PM
(#26948602)
I once thought about building this, but it's much harder than you think.
The data has to be processed very quickly. I believe you should think in terms of 0.3m groove per second.
If you put a camera above the groove you also need something like a stepper motor to control the arm.
But I believe the biggest problem is dust. A needle will move small particles out of the way, but a camera does not.
This is also why laser turntables need 'clipping' filters. Dust will create all kinds of noise you don't want to hear.