last update: 3rd March 2007
Some sections of damage, particularly those longer than a few dozen
samples, are often best repaired by replacing them
with a similar but undamaged block of waveform from nearby. Wave Repair
has a number of facilities for copying over such blocks:
After copying a block, it may be slightly offset vertically, so there
is a facility to "nudge" a block up or down to match its surroundings.
- From one channel to the other.
If the damage is on only one channel (this happens when only one wall of the
groove is damaged) and the other channel is much the same,
then copying the block over from the undamaged channel often works very well.
This is especially useful when restoring mono records (provided you have
recorded them in stereo).
- Repeat the immediately preceding block.
This is effectively the software equivalent of those old hardware descratcher
modules that were available in the 1970s and 1980s. The block is replaced by
what came just before, in the expectation that it will be similar to
what is being replaced. Such an expectation should perhaps be regarded more
as a hope, but the method can work very well in some circumstances.
- Copy over an arbitrary block from elsewhere.
Wave Repair has a facility known as "block overlay". Here, the damaged section
to be replaced is highlighted and then an image of it can be moved
around over the surrounding waveform, looking for a suitable replacement
block. Having an image of the
damaged block superimposed over the waveform allows a visual comparison
to be easily made.
Example Screen Shots