On Mon, 25 Oct 2010, Hans-Christoph Steiner wrote:
zero-crossing detection is the basis of cheap pitch detection,
Yeah, but cheap like that is not worth buying into.
and it also useful for automatically find cut points in samples so that
there aren't clicks.
Right... instead, the worst it can get is a click-like artefact of a
different order, which is very much quieter, without any bass in it, and
usually not very noticeable (but there are exceptions). It's that the
waveforms have non-matching angles at the junctions. This is the kind of
problem there is with stretching high frequency signals using [tabread4~],
for example, whereas [tabread4c~] is fine.
In math words we'd say « zero-crossing splicing produces a C0 curve, but
doesn't try to produce a C1 curve, and almost never does ».
_______________________________________________________________________
| Mathieu Bouchard ------------------------------ Villeray, Montréal, QC
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