WavPack 4.41 beta3 available
Reply #30 – 2007-05-07 14:49:23
... I think -ans or negative shift might add a subtle 'whooo' noise as opposed to the normal 'tsssss' hiss. ... Guess we're talking about the same thing now, and it's just subtle to you and rather annoying to me which may be a matter of taste, as is this:... So far Bryant's -ans is stable enough for me - better that Ghido's and better than the current wavpack default. Maybe manual tunings are sometimes better ... which depends for instance on how to weigh the distortion like problems against the hiss problems, how to judge the difference ans against s0.4 for the better and worse, and how to weigh the fact that with ans noise character can rapidly change within a track. It's individual judgement, that's all. Anyway I'd prefer an equal loudness curve based noise shaping over individual parameters, but when it's up to a wish list I feel a better quality control is more of concern. No matter which preference on noise shaping wavPack lossy usually is very good even with fast mode at ~ 300 kbps and it would be great to have a machinery which uses more bits in situations when the effective S/N ratio is bad when using ~ 300 kbps. And from my understanding this is easier to implement than a complicated noise shaping scheme (though a noise shaping which keeps noise flat in frequency for say 35% of the noise and put the other 65% into the area above say 12 kHz [to a strongly increasing degree the higher the frequency, pretty soft at ~ 12 kHz, still rather soft at ~15 kHz, but strong at ~21 kHz] sounds rather rappealing to me).