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A.S.
16-02-2011, 09:59 AM
We've mentioned here (http://www.harbeth.co.uk/usergroup/showthread.php?1140-Frequencies-sound-waves-and-hearing&p=12916#post12916) and here (http://www.harbeth.co.uk/usergroup/showthread.php?1140-Frequencies-sound-waves-and-hearing&p=12916#post12916) about the surface noise problems that bedevil vinyl LP records. If we record from the LP into a computer i.e. we digitise the record, we can attempt to restore and repair problems with the disc.

First we need to capture the audio from the turntable. Here (http://www.youtube.com/watch?v=88nBpPU6QKU&feature=related).

Then we can attempt to remove some of the defects of the vinyl disc. Here (http://www.youtube.com/watch?v=ts11mER9YH4). You can see how a digital recording of an analogue LP has enough resolution so that even the clicks are well coded here (http://www.youtube.com/watch?v=mJ5Y02vJkfA&feature=related). Zoomed-in, there are 44000 sample spots every second in a CD digital recording and these can be manipulated in a suitable audio editing program. Clicks can literally be painted out.

Remember! Every time we remove defects (clicks, scratches etc.) we remove some musical detail. But if that musical detail is anyway obscured by surface noise then it has gone anyway. And gone means gone. Irrecoverable. All we can do is disguise the limitation of the gramophone record, not turn it magically into a super wide-band, pristine, high dynamic range CD digital recording. That would be impossible. We can't put back what is simple not there and never was.