From: liz@poppyrecords.invalid.invalid   
      
   john larkin  wrote:   
      
   > On Thu, 1 Jan 2026 10:34:44 +0000, liz@poppyrecords.invalid.invalid   
   > (Liz Tuddenham) wrote:   
   >   
   > >john larkin  wrote:   
   [...]   
   > >> I suppose that if you had two or more ratty records and wanted to make   
   > >> a good digital copy, you could play them all and do some clever   
   > >> processing.   
   > >   
   > >The idea was peoposed by Peter Copeland of the UK National Sound Archive   
   > >about 20 years ago.  At the time it wasn't possible to synchronise the   
   > >two copies accurately over a long period of time but he did manage to   
   > >synchronise them for a few seconds, which was long enough to demonstrate   
   > >that the idea worked   
   > >   
   > >His concept was to have multiple copies on  a 'cake-stand', all playing   
   > >simultaneously.  The speed variations due to the turntable would be the   
   > >same for all copies and offset errors due to variations in the starting   
   > >point would be constant, so there would only be variations caused by   
   > >excentricity and ovality for the software to remove.   
   > >   
   > >What most people don't realise is that a mono disc already contains two   
   > >copies of the sound, one on each groove wall; it is the difference   
   > >between these two copies that is used by my archival disc player to   
   > >identify the unwanted noise.   
   > >   
   > >< http://www.poppyrecords.co.uk/other/Turntables/de-clicker.htm>   
   >   
   >   
   > The processing should obviously be digital. That would fix speed   
   > variations, noise, skips, everything.   
      
      
   Why is that the first thing everyone says?   
      
   Nobody has made a digital system that works in real-time and can be   
   built into the base of a record player with a single control knob (as   
   far as I know).   If it could be done in digital, why hasn't anyone done   
   it?   
      
      
   --   
   ~ Liz Tuddenham ~   
   (Remove the ".invalid"s and add ".co.uk" to reply)   
   www.poppyrecords.co.uk   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)