Adobe 22011292 User Guide - Page 180

166 CHAPTER 8 Effects Menu - Edit View Clip Restoration Adobe Audition's Clip Restoration filter can remove the evil occurrences of clipping from your waveform. It does this by actually "filling in" the clipped segments of the waveform. Clip Restoration dialog Clipping is a phenomenon that occurs in digital audio when the amplitude value of a signal exceeds the maximum level that can be represented by the current bit resolution (i.e., 256 steps in 8-bit audio). This can happen when your source recording levels are simply too high. Clipping causes the signal to distort, and appears in the waveform display as a "chopping-off " of the top or bottom of the waveform. The audible result is a static-like distortion. Note: Don't use DC Bias Adjust on any audio you wish to run the Clip Restoration filter on, because DC bias adjusted material modifies the clipped area and makes it unrecognizable as being clipped. (You can do a DC adjust after de-clipping, of course.) Note: You can monitor clipping occurrence during recording or playback by watching the level meters under the waveform display. If clipping occurs, the box(es) on the far right of the level meters will light up. Input Attenuation This parameter, measured in dB, specifies the amount to amplify the signal by before processing. Overhead This is the amount of play there is, measured in percentage, for detecting clipped regions. A value of zero will consider only perfectly horizontal line-type clipping to be "clipped." A value of 1% will allow the horizontal line to vary up to 1% away from maximum amplitude. Values of about 1% work best since they catch almost everything, which leads to a more thorough repair. Minimum Run Size This value specifies the length of the shortest run of clipped samples to fix. A value of 1 will fix all samples that seem to be clipped, while a value of 2 won't fix a clipped sample if it's not followed or preceded by another clipped sample.