lossyWAV 1.2.0 released, Added noise WAV bitdepth reduction method Options

[Nick.C]

lossyWAV 1.2.0 is released.

lossyWAV is a near lossless audio processor which dynamically reduces the bitdepth of the signal on a block-by-block basis. Bitdepth reduction adds white noise to the processed output.

Changes from 1.1.0c:

• Now compatible with FFTW (requires libfftw3-3.dll to exist on the path);
• Spreading function changed;
• Noise shaping now off by default - can be switched on to automatic or user specified value;
• Introduction of --altpreset parameter which modifies internal presets and lowers upper frequency limit used in determining noise floor to 15.16kHz;
• Major code cleanup.

Download [maintenance release 1.2.0b]:

• Executable  lossyWAV_1.2.0b.zip ( 76.17K ) Number of downloads: 479
  
• Source  lossyWAV_Source_20101122_1.2.0b.zip ( 209.64K ) Number of downloads: 205
  

This post has been edited by Nick.C: Dec 2 2010, 21:48

[halb27]

I tried your sample, shadowking.
At -q 1 --altpreset I oould hear the issue (though I don't now if I would have noticed it if I hadn't known the spot).
At -q 2 --altpreset I still beleive I could hear it, but wasn't able to ABX it.
Well, probably my ears aren't good enough (I celebrated my 60th anniversary last year), or maybe I didn't try hard enough.
Anyway I think the issue can be classified as very subtle at -P --altpreset, but please tell us if you disagree, shadowking.

Nick, what do you think about skipping the old preset quality scheme?
With the new scheme the quality keeps closer to that of -q 5 for all the quality settings. -P takes profit of it qualitywise, and it is even more relevant for the lower quality settings the quality of which doesn't deviate too much from that of -P.
Two quality schemes aren't attractive in the long run, and IMO the new scheme is more attractive.
Maybe we should have an intermediate named quality level between --portable and --standard, corresponding to say -q 3.5 --altpreset as a proposal, now that we know -P isn't transparent. This quality level should produce transparent results with a small safety margin, so '--transparent' can be an adequate name.

This post has been edited by halb27: Jan 29 2010, 21:46

[pdq]

(I celebrated my 60th anniversary last year)

You mean birthday. 60th anniversary would make you my parents' age.