23 Sep
2007
23 Sep
'07
11:06 p.m.
On Tue, 22 Apr 2003 19:54:09 -0500
"Dustin Barlow" <duslow at hotmail.com> wrote:
<snip>
So..? Most PCM converters utilize a 1-bit stream also. Why not
utilize all the tools available for the task at hand?
As for processing, you can look at a PCM representation of a waveform
to ease the processing load and then just apply the changes to the
orignal DSD stream without ever having to process in the 1-bit domain
directly (which is way more processor intensive since you have to look
at a huge chunk of the stream in order to extract the amplitude data
that is available in each multi-bit sample).
IMHO, though, the hippest alternative at present is to process a DSD
stream in the analog domain and re-record it to DSD. This results in
a very "analog" sound. These days you can get analog gear with a
respectable dynamic range for a song (Mackie Onyx anyone?). When you
can get a 130 dB S/N ratio in the analog domain you really don't lose
too much converting back and forth from 1-bit domain. It's freakin
sweet!
If you haven't tried recording 1-bit. Do yourself a favor and demo
one of the new Korg recorders. It really is really good, no kidding.
~Maitland
I read an interesting article on Direct Stream
Digital (DSD) / Pulse Density
Modulation (PDM) entitled "A Better Mousetrap" by Brian Smithers in the May
2003 issue of Electronic Musician. Since, Brian did a good job explaining
PDM/DSD in quasi-layman terms, I'll just quote snippets from his article to
set the stage for my questions.
<snip>
DSD/PDM appears to be a superiour technique for
recording and playing audio
material.
Having been around digital audio and digital signal processing for over 10
years, I am still far from convinced.
Granted, this technology may never catch on
because of all the
hardware and software changes that would be required to mirror what a
typical PCM based DAW currently does. But, if DSD/PDM does catch on, and
DAWs start being produced, how will this effect current audio DSP
techniques?
I have not looked into the maths behind algorithm development in DSD/PDM,
but I doubt it is anywhere near as easy as with PCM.
The article mentions a program called Pyramix
(Windows) which features DSD
support. However, for Pyramix to do EQ, dynamics, reverb processing, and to
display waveforms and vu levels, it converts DSD to a "high quality" PCM
format.
That should tell you something :-).