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One simple technique is to use an eq noch filter right at the frequency of
the hiss (like Dolby). If you play with what freq. and how wide a band
you grab, you can usually get rid of hiss without taking too much of the
music. It won't help with pops or other random noises, but I image it
would be good for olde speeches.
What are the speeches of ? Anything interesting ?
dd
_____________________________________________________________________________
I consider myself an artist, and I do what I love to do. And I don't have
to live in squalor, because people pay programmers good sums of money.
- Linus Torvalds
Drew Volpe volpe@fas.harvard.edu
_____________________________________________________________________________
On Thu, 19 Aug 1999, Kurt S Nelson wrote:
> Dear Csounders:
>
> I am attempting to clean some noisey soundfiles using the dam opcode.
> The signal (a piano piece off a CD) is not much above the noise floor of
> the original recording. Hhaving not worked with compression or expansion
> much in the past, I am having a hard time selecting values for the
> threshold and compression ratios that result in a sound much better than
> the original. Can anyone suggest any other opcodes or techniques for
> audio cleaning (maybe the term "de-essing" applies here)?
>
> This is a project I am doing to practice for cleaning some old speeches
> on reel-to-reel tapes, and to educate myself in general. Any suggestions
> would be greatly appreciated.
>
> Sincerely, Kurt Nelson
>
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