[gmpi] Re: Decision Time: 7.1.2
- From: "Jeff McClintock" <jeffmcc@xxxxxxxxxx>
- To: <gmpi@xxxxxxxxxxxxx>
- Date: Fri, 13 Jun 2003 18:49:14 +1200
> > . Sony's "Super Bit Mapping", or Apogee's UV22
> What the heck are those?
When you convert floats to 16 bit int, to send to your Soundblaster Live, or
burn to CD, you often 'dither' to preserve as much dynamic range as posible.
Helps mask the 'grainy, digital' sound.
The easiest way is to modulate the least-significant-bit with noise, but
it adds a bit of hiss to your recording. The solution is to filter the
noise (noise shaping) to remove the most audible freq ranges.
The best filters are trade secrets, or patented I guess, I'm no expert, but
i believe Sony take the dithering process further than what I've described,
adding their own voodoo......
Disclaimer: I'm no expert on dithering, this is just my layman's
understanding....
Super bit mapping...
http://www.seoulsound.co.kr/sacdtech5.htm
UV22...
http://emusician.com/ar/emusic_apogee/
enjoy,
Jeff M
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