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legally
2019 Feb 16
1
Potential transient pre-echo reduction filter
...lock size to really emphasize the transient
error diffusion, and the pre-echo seems to be cut down by half with no
other effort at all. Adding another layer of this transform (ie.
X[i*4]+/-X[i*4+2]) doesn't seem to improve things much, though. Perhaps
a more frequency-selective wavelet (eg. LeGall5/3 or CDF9/7) would
improve things a bit more, but in honesty I don't really have the
motivation to test any further than this.
I've included some examples of this modification in action (please
excuse the particular taste in music; I just find it very useful for
this kind of testing)....