mswlogo;542277 Wrote: > Very nice post Phil. > > I agree with a lot of it except a couple things. > > People keep using Brahms and Marching bands simultaneously as an > example. > > Well I for one dont listen to Smashing pumpkins and harp in the same > digital sample. > > Music swings from high to low. > > So that quiet passage that you say is 7 bits you would not notice 2 > bits more missing (4x softer)? I would expect that would go from being > barely heard to not heard at all. > > Couldnt that SAME song with 7bits switch to something much louder > (full scale)? So you would never turn it up and down as the song > progresses, right. > > But as others have mentioned I think you can detect a presence or > should I say absence when low bits are toyed with even during busy > moderate volume material. That is certainly arguable. But the impact to > material that swings low can very significant. > > People keep thinking of all this as instantaneous and what can happen > in one moment and what the dynamic range is at one moment. > > Research how HDCD works. It basically slides the resolution up and down > where its needed depending on how loud it is. To effectively get 20bits > bit dynamic range over time. But instantaneously it is actually only > 15bits. Why would they even bother? Because the requirements change > over time.
I was going to use HDCD (and the subcode in the LSB) as an example... you can't hear it :-) You can't keep (blindly) shifting the level up ONLY when things get quieter - that's "expansion" and sounds bad - well at least not natural.... you will hear the noise floor pumping... If you want a natural dynamic range you must leave the level fixed. The part of HDCD you refer to is a cunning implementation of a compander and does get you and extra "2 bits" of SNR/dynamic range. Rather like DbX used to. It's very clever. However, the crucial thing with HDCD is that it doesn't sound in any way bad on a non-HDCD DAC... -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... Touch(wired/XP) - TACT 2.2X (Linear PSU) + Good Vibrations S/W - MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Kitchen Boom, Outdoors: SB Radio ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=77725
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