<<6) As far as experiencing/playing back high Hz recordings one can a)
draw spectrographs and try to be happy with them b) slow down the
playback c) use some sub-sampling scheme to reduce the frequency of
the samples or d) use some transform or heterodyne technique to focus
on a specific frequency range and make it audible.>>
=95 ProTools can play back at half speed.
=95 Using the free app Sound Hack you can fool the host DAW by
rewriting the sample rate header to twice its actual rate. The DAW
will then play the file at half speed.
=95 Peak has a DSP option for altering pitch. With "Preserve duration"
unchecked, I believe it simply plays the file at a lower sample rate,
rather than resampling.
<< What do any of these methods (c&d) do to phase information?>>
Don't really know, but if a file is simply played back at a lower
sample rate phase information SHOULD be unaltered. With resampling,
i.e. pitch shifting while preserving the original file duration,
things get very messed up very quickly in terms of gain, timbre &
general signal quality. I would expect phase to be part of what
suffers as well.
Scott Fraser
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