On Sun, Mar 15, 2009 at 2:44 AM, hard off hard@gmail.com wrote:
to re-create the sound of a dx7 i need to change samplerate from my default
(44.1khz) to 28khz.
globally changing pd's samplerate to 28khz has the intended effect, but i
want to be able to run other patches at 44.1khz while
One thing that occurs to me is that the quality of the reconstructed
sound has more to do with the interpolator rather than the sample
rate.
i have a feeling that because the synth has non-bandlimited oscillators,
that the sample rate itself is pretty important, or more importantly, the
aliasing
so if those aliasing effects are going to help, then maybe a big step will
be to ADD aliasing. there are a couple of suggestions here:
http://www.music.columbia.edu/pipermail/music-dsp/2002-March/047953.html
and here:
http://www.music.columbia.edu/pipermail/music-dsp/2002-March/047966.html
i had a minor breakthrough.
upsampling my signal path, by using [block~ 64 1 2] has the same effect on
the sound as lowering pd's global sample rate to 22050.
not perfect, and to me it defies logic, but certainly a lot closer to the
28khz sound than the 44.1khz sound was getting.
Hmm. I thought the DX7 was ~57khz, anyway:
http://www.maths.abdn.ac.uk/~bensondj/html/Chowning.html
On Tue, Mar 17, 2009 at 2:35 AM, hard off hard@gmail.com wrote:
i had a minor breakthrough.
upsampling my signal path, by using [block~ 64 1 2] has the same effect on
the sound as lowering
so, i thought about this more, and realized that 28hz is quite close to
being 2/3 of 44.1
so, it MIGHT be enough to do the following:
for every 3 samples, output the first sample, the second sample, and then
instead of playing the 3rd sample, repeat the second sample.
so, if my block looks
hard off wrote:
to re-create the sound of a dx7 i need to change samplerate from my
default (44.1khz) to 28khz.
globally changing pd's samplerate to 28khz has the intended effect, but
i want to be able to run other patches at 44.1khz while running my dx7
at 28khz.
I think that the sound
hi martin, thanks for taking the time to reply.
i can set pd to whatever samplerate i want in media-audio settings. i just
checked again going through a whole bunch of values between 22050 and 44100
and they all work.
my problem is that the samplerate is global, and i need it only to be
local.
actually, i just checked and that method i suggested before doesn't work at
all. it's the same as the [phasor~ 28000] - [samphold~] effect.
martin, i missed this part of your mail before:
Unless you're looking for aliasing artifacts, wouldn't it be easier to use
a multi-pole low-pass filter
hard off wrote:
hi martin, thanks for taking the time to reply.
i can set pd to whatever samplerate i want in media-audio settings. i
just checked again going through a whole bunch of values between 22050
and 44100 and they all work.
Yes you're right. I should have checked first ;)
Maybe
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