Print

Print


Carl is great, there is an odd disconnect with him not being a restoration guy, few years back I suggested that the servo output of his focussing mechanism could create a topographical map of the warpage and groove depth and it wasn't clear why that could be if interest. It's not in his wheelhouse. But the data acquisition of the groove itself is superb. 

Please pardon the misspellings and occassional insane word substitution I'm on an iPhone

> On Oct 26, 2013, at 2:40 PM, Tom Fine <[log in to unmask]> wrote:
> 
> Hey Matt -- the reply-to thing is fixed!
> 
> I agree with your comments. What encourages me is that there is so much research -- a lot of it funded by government spy agencies -- going on with automated image-enhancement software. Perhaps a "peace dividend" outgrowth will be new tools to "heal" damaged groove walls in scans of disks.
> 
> -- Tom Fine
> 
> ----- Original Message ----- From: "Matt Sohn" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Saturday, October 26, 2013 4:54 PM
> Subject: Re: [ARSCLIST] Advice needed on removing / minimizing tape bleed-through
> 
> 
>> I saw one of the demos that Haber and his associate did in New York.
>> I think that an image-based approach to noise reduction is something that ought to be explored.
>> From the images I saw at the demonstration, it is clearly obvious to me which parts of the image are the walls of the groove, and which parts were imperfections in the groove wall.
>> If the imperfections were "healed" before the images were converted to audio signals, that would create a more faithful reproduction of the original recording, no?
>> Quite a labor-intensive task, though. Having to correct each image individually. I suppose algorithms would have to be developed..
>> -Matt Sohn
>> P.S. Is my reply-to thing coming through correctly? I am composing through Windows Live, instead of Yahoo.
>> 
>> -----Original Message----- From: Doug Pomeroy
>> Sent: Saturday, October 26, 2013 12:55 PM
>> To: [log in to unmask]
>> Subject: Re: [ARSCLIST] Advice needed on removing / minimizing tape bleed-through
>> 
>> Hi Tom,
>> 
>> I wish I could share your optimism about future developments.
>> 
>> Haber's work has been concerned with developing and improving his optical mechanism.
>> As far as I know, he hasn't done any work on audio restoration (the first demo which he
>> released several years ago was quite noisy), as it is not his field of expertise.  But the ultra
>> high resolution of his scans offer much information about the nature of disc surface noises,
>> which may help those working to perfect noise removal processors.
>> 
>> Doug Pomeroy
>> [log in to unmask]
>> 
>> 
>>> Date:    Fri, 25 Oct 2013 08:18:52 -0400
>>> From:    Tom Fine <[log in to unmask]>
>>> Subject: Re: Advice needed on removing / minimizing tape bleed-through
>>> 
>>> Hi Ted:
>>> 
>>> Much better!
>>> 
>>> The wonders of modern DSP in careful craftspeople's hands!
>>> 
>>> The next frontier will be figuring out how to grab the just musical content out of a noisy grooved
>>> disk and then un-do the problems of groove distortion and disk wear. I hope Carl Haber's work leads
>>> there -- scan the groove and then come up with some kind of Photoshop-like algorhythm to "heal"
>>> groove wear and the material on the groove surface that produces playback noise (I'm assuming that
>>> comes down to rough-surface shellac, which would need to be differentiated from minute lateral
>>> changes in the groove, ie soft-dynamic music content). I am optimistic that such a system will
>>> emerge in my lifetime. Imagine few-dozen-dollar software that enables you to scan your 78RPM disks
>>> on a high-resolution flatbed, then "heals" the ravages of time and the problems with the original
>>> shellac compound and saves a clean,crisp audio file to your hard drive.
>>> 
>>> -- Tom Fine
>>