Poor Quality Interview Tape Recording

Effects, Recipes, Interfacing with other software, etc.
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whomper
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Re: Poor Quality Interview Tape Recording

Post by whomper » Fri Feb 19, 2010 5:21 pm

billw58 wrote:
whomper wrote:pls describe what this fix thing is doing
The best I can do is quote from the effect itself:
Clip Fix attempts to reconstruct clipped regions by interpolating the lost signal. Before use, reduce amplification by 10 dB to give room for the reconstruction (In other words, select the entire track and do Effect > Amplify with "Amplification" set to -10). 'Threshold' is how close to the maximum sample magnitude any sample must be to be considered clipped. If processing is slow, select only a few seconds of clipped audio at a time."

Clip Fix is a simple, stupid (but not blind) digital-clipping-corrector
The algorithm is fairly simple:
1. Find all clipped regions
2. Get the slope immediately on either side of the region
3. Do a cubic spline interpolation.
4. Go to next region
The default Threshold of 95% seems to work well.

To see it in action:
- in a new project, Generate > Tone with default settings
- select entire track
- Effect > Wah Wah with default settings - clipping will be created
- Effect > Amplify with Amplification -10 dB
- Effect > Clip Fix with default paramters

-- Bill
interesting

i can see how it makes it less unpleasant to hear when the D/A circuits recreate the original
but
unless my textbooks are wrong
it cannot come close to recreating what was there before the clipping -- just make it less harsh

kozikowski
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Re: Poor Quality Interview Tape Recording

Post by kozikowski » Fri Feb 19, 2010 6:44 pm

<<<just make it less harsh>>>

Also right. Which is why it can "hide" peak distortions, cracking, or crunching every ten minutes or so, but is increasingly helpless in the face of more and more distortion and damage.

We still people they can't recover from overload distortion because by the time they post for help, they can't.

Koz

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