[sdiy] Build a board to restore audio

[Richard Wentk]

At 11:35 28/11/2002 +0100, bo ca wrote:

>Hi to everyone!
>
>This is not about synths but maybe some of you can help me. I am looking 
>for information to build a board to restore audio. Something to remove the 
>noises and the typical harmonics provided by power supplies, records, etc...

This is a lot easier to do well in software than hardware. Something like 
Steinberg's Clean or Roxio's Easy CD includes the tools you need, and will 
cost a lot less and be more effective than trying to build a box to do it.

There are effective tools like Cedar that work in hardware, but they're 
*very* expensive. And they're DSP-based. Most analogue solutions are going 
to be a band-aid that does more harm than good to the signal. You can 
bimble around with analogue scratch filters and hum-removing comb filters 
and the like but it's really a lot of hassle, and won't be nearly as useful 
to you as the software I mentioned.

Richard