What is the best way to remove crackle?
Wave Corrector is less effective against crackle than against other types of noise. The program is designed to restore vinyl recordings which generally contain discrete clicks rather than constant crackle. Crackle is more typical of old shellac records (78?s). Unfortunately, crackle is a type of noise which is too continuous for click corrections to be totally effective; but it is too impulsive for a hiss filter to be effective. In Wave Corrector, clicks are detected by a statistical algorithm which analyses the music and looks for statistically significant departures from the norm. A constant background crackle makes it very difficult for this algorithm to differentiate between the music and the noise. On the other hand, the hiss filter assumes a smooth constant level of background noise (rather like when you de-tune an FM radio). Because crackle contains high amplitude instantaneous peaks, it cannot be completely removed by the hiss filer either. In fact, if you apply the hiss filter
