I've read up about taking 24bit audio down to 16bit without loosing the sonic clarity of the original composision. My DAW software has the Apogee UV-22 algorithm included. Is this used or is there some other method? Or is this process considered as truncating or dithering? :w:
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And I'll tell you why I asked. I have the Sony CDR-W33 Standalon
And I'll tell you why I asked. I have the Sony CDR-W33 Standalone Burner and I have the SPDI/F output from my Layla24 going into it. I had no problems transfering digital audio like this when I was running Win98. But all I get now is "den unlocked" or something to that nature. What could this be? It only started when I upgraded to XP.
Actually, there are two related things here - but its good to no
Actually, there are two related things here - but its good to not confuse them.
First is sample *rate* conversion. CDs are sampled at 44,100 samples per second. Recordings are often at 48k, 88.2k, 96k or even 192,000 samples per second. The advantages of the higher sample rates are a huge matter of debate. Some folks say its worth it, others say don't bother - especially over 48k. Software needs to take the data as recorded and convert the sample playback rate to match the CD rate. There are several related ways for resampling - some better, some worse. Cool Edit Pro will let you choose what way to use - the better ones are a lot more computationally intensive and take a lot longer.
Strange note: Sonar is great program, but does not do sample rate conversion -- one strange omission. That's why I use Sonar *with* Cool Edit Pro for my own work.
Next is bit depth conversion. Each of the samples at the previous rates has a particular size -- for audio it is typically 16 bit or 24 bit. There are some huge advantages to using 24 bit while recording and mixing, and going to 16 bit after all processing. When you are going from a higher bit depth (like 24-bit) down to a lower bit depth (like 16-bit) you can get there by just chopping off the lowest bits -- a process called truncation. However, a while back, folks discovered that by adding a smidgen of noise (dither) to the signal, it can sound a LOT better. Think of it this way -- if you are trying to represent 4 1/2, having a signal vary between 4 and 5 will be closer than a signal that is stuck at 4 or 5. Apogee came up with a particular way (UV-22) for adding dither noise to a signal that sounded exceptionally good at the time. There are several different algorithms for adding dither-- and each has its uses, and might actually sound better for particular sound material. Cool Edit Pro will let you choose between different dither algorithms.
http://www.izotope.com/products/audio/ozone/ozoneguide.html has a couple of PDF files that explain this in much better detail, and has some sample audio files to illustrate how it sounds.
-lee-
Originally posted by dabmeister17: And I'll tell you why I ask
Originally posted by dabmeister17:
And I'll tell you why I asked. I have the Sony CDR-W33 Standalone Burner and I have the SPDI/F output from my Layla24 going into it. I had no problems transfering digital audio like this when I was running Win98. But all I get now is "den unlocked" or something to that nature. What could this be? It only started when I upgraded to XP.
I could be wrong, but I wonder if this is related to the copy protection bits in the spdif interface...
-lee-
Originally posted by dabmeister17: Kurt I have a question , wh
Originally posted by dabmeister17:
Kurt I have a question , what platform are you working with? I'm currently on WinXP.
Windows XP Pro.. The copy protection could be what's happening.. I use a Fostex CDr recorder that doesn't have copy protection. Consumer burners do impliment copy protection schemes..
A year or so back there was a nice website that provided a full
A year or so back there was a nice website that provided a full featured double blind test for comparing different dithering algorithms. I think UV-22 was one of the winners. I can't remember. I remember the Waves dithering plugin was voted higher as well. You could really tell the difference between some of them. some of them had horrible sounding dynamics sub-noise floor.
Also to consider is noise shaping, which will change it so there's less 'hiss'.
oh, here you go.. sorry if i was wronge http://www.24-96.net/
oh, here you go.. sorry if i was wronge
Originally posted by Opus2000: Kurt UV22 ONLY DITHERS!!! Do
Originally posted by Opus2000:
KurtUV22 ONLY DITHERS!!! Does NOT SRC(Sample Rate Convert)!! BIG DIFFERENCE!!!
Always bounce down from 48 to 44.1 THAN Dither down to 16 bit.
Opus :D
So you are saying to export a mix down from 48 -> 44.1 at 24bit. Then take that and bounce down to 16 with dither?
If you have a 32 bit mix engine couldn't you argue that you'd still need dither for the 24bit mix?
d./
UV-22 is an Apogee dithering product.. It takes a 48K digital si
UV-22 is an Apogee dithering product.. It takes a 48K digital signal and dithers it down to 44.1
I come out of my audio card, a Dakota at 24 bits through the s/pdif output and run it straight into my Fostex CDr burner. The extra bits are dropped automaticly. I can also go from my CDr burner at 16 bits into the DAW upsampleing to 24 bits.. This works great and sounds damn good..