Re: Poor Quality Interview Tape Recording
Posted: Fri Feb 19, 2010 5:21 pm
interestingbillw58 wrote:The best I can do is quote from the effect itself:whomper wrote:pls describe what this fix thing is doing
The default Threshold of 95% seems to work well.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
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
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