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Waveform Replacement
Several techniques are used for more-demanding
restorations, depending on the type/duration of damage and where it occurs in
your recording. We use the following techniques:
 | Computed Waveform Replacement:
This (algorithm) method analyzes audio material surrounding the defect at
selectable durations, and creates a synchronized replacement based upon the
selected sample of surrounding material. This technique is best where
the defect occurs inside a passage of homogenous material (for example, during
a sustain). |
| Spectral Editing: This method
is useful for dampening or removing sounds that are fairly constant in nature,
such as narrow-band impact noises, coughs, bumps, etc. The noise is
identified and selected in a frequency spectrum, and removed using FFT
(Fast-Fourier-Transform) sharp-knee filters. |
| Hand Waveform Replacement: This
is used where undamaged material that is closely-identical to the damaged
material exists elsewhere in a recording. The duplicated material
replaces the defect, and its "ends" are re-linked at zero-crossings at the
head and tail. The lengths of replaced and replacing material are
precisely equal. This method is useful for defects in complex material. |
A typical spectral editing screenshot of waveform
replacement is here.
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