2bdecided wrote:Searching Google for dither (here in the UK at least - Google results are regionalised, even if you select all of the web)...The 3rd hit is by Nika Aldrich. Nika turned up on one forum years ago (I can't remember if it was r3mix, mp3.com, or somewhere else) proudly announcing his new article on dither. Let me say first that, in his area of expertise, Nika Aldrich is widely respected. However, dither apparently wasn't his area of expertise at the time, and his article was roundly criticised for being simply incorrect. From the advice on that forum (which would have included advice from people who are on HA now) I believe he corrected his article.
This article is now probably very useful, because it is written from the point of view of someone learning about dither.
However, I can't bring myself to like it simply because I remember how wrong it was in its first draft, and how many of the r3mix/mp3.com/HA crew are the true authors, and don't get any credit.
The 8th hit - finally - is by Bob Katz. Now, this guy is a genius.http://www.digido.com/portal/pmodule_id=11...der_page_id=27/Read that one. Not the first 7. It's written by someone who knows exactly what they're talking about, it includes some pictures, and he's a very nice guy too (he helped me with ReplayGain).
Quote from: RockFan on 01 September, 2006, 05:43:07 AMEvery attempt to state what should be obvious - that our ears and how enjoyable and 'realistic' music playback is (or isn't) should ultimately arbitrate on music reproduction is met with the catch-all "prove it. Show your ABX results", and TOS invoked. Unfortuntately this leaves little room for any meaningful debate.You can enjoy your music as and when you please.The purpose of ABX is to demonstrate that an audible difference exists.
Every attempt to state what should be obvious - that our ears and how enjoyable and 'realistic' music playback is (or isn't) should ultimately arbitrate on music reproduction is met with the catch-all "prove it. Show your ABX results", and TOS invoked. Unfortuntately this leaves little room for any meaningful debate.
Not to mention that blind tests are the best known way to make sure one's *ears* are 'arbitrating', rather than one's eyes or one's prejudices. If someone's not willing to do a blind comparison, maybe they don't really trust their ears.
(images snipped)Top Trace : 14khz tone as 44.1k 16bit PCM file. This is the view of the actual file when loaded into "Audacity".Middle Trace : Actual analog out when above PCM file is played (foobar) without any resampling or DSP. Soundcard is onboard "soundmax" AC97 of cheap motherboard. (Photo of osciloscope image)Bottom Tave : As above but zoomed in.
Cool, thanks uart! What brand of scope is that? Digital scopes are really great tools, but they just don't have the same feel as the old school green phosphor CRT type
Higher sample rates make the analog anti-aliasing filters much easier
Aliasing occurs on the A/D side of things, not the D/A side of things.I think the misuse of this word was corrected a while back.
Sure it's a great idea to master the music at higher bitdepth and samlpe rate. Higher sample rates make the analog anti-aliasing filters much easier and higher inital bitdepths mean that edits can be lossless at the final bitdepth level.
This is perhaps true, but the counter argument is that if a digital player is not playing back a 0dB 19997kHz sawtooth (or a 0dB 10kHz square wave) with even amplitude accuracy (let alone harmonic accuracy), then that represents a kind of “distortion” that is audible.
Thinking about it, there are neater solutions, even in Cool Edit. e.g. generate the required (in band) harmonics manually by summing sine waves (settings in the tone generator let you do this).
About Christine ThamChristine Tham has always been a keen "hi fi" enthusiast, which is an affliction she inherited from her father. She was interested enough in the subject to enroll in an Electrical Engineering degree at Sydney University , but decided that was not for her and graduated instead with a University Medal in Computer Science (Honours) and subsequently a Master of Applied Finance from Macquarie University.
Hey, too bad that she pulled out of that EE course before they covered the stuff pre-sample filtering.
Perhaps you can direct the more knowledgable people on those forums to construct a new test sequence that is more real world? We're open to additional input.__________________Clint DeBoerEditor in ChiefAudioholics
We're open to additional input