[pd] 100000hz+

2006-10-26 Thread hard off

i just made a synth which makes some really nice tones when i feed it
really high frequencies.  (midi notes 150-300)

question is, will this sound the same on all computers, or do
different systems handle such high frequencies differently?

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Re: [pd] 100000hz+

2006-10-26 Thread Georg Holzmann

Hallo!


i just made a synth which makes some really nice tones when i feed it
really high frequencies.  (midi notes 150-300)

question is, will this sound the same on all computers, or do
different systems handle such high frequencies differently?


Hm ... it depends in the sampling frequency.
The frequencies are mirrowed at sr/2, so if the sr is the same it should 
work (but I haven't tried it ...)


LG
Georg

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Re: [pd] 100000hz+

2006-10-26 Thread Tim Blechmann
On Thu, 2006-10-26 at 17:59 +0900, hard off wrote:
 i just made a synth which makes some really nice tones when i feed it
 really high frequencies.  (midi notes 150-300)
 
 question is, will this sound the same on all computers, or do
 different systems handle such high frequencies differently? 

it will mainly depend on the sampling rate, since i guess, the sounds
that you produce contain aliasing artifacts ...

cheers ... tim

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Re: [pd] 100000hz+

2006-10-26 Thread Chris McCormick
On Thu, Oct 26, 2006 at 10:48:32PM +0900, hard off wrote:
 this is a bummer, cos i am getting a really nice palette of sounds
 here, and i wanted to share the patch
 
 oh well, i'll stick to normal midi notes for that i guess.

Don't be too bummed out. Given what's been said here I'm not sure exactly
how this happened, but I made the types of sounds you're talking about
(an [osc~] at +127 midi) and recorded them to a wav file and imported that
wav file into a .XM file and then played that .XM file back on a gameboy
advance, and it sounded pretty much how it did in the original instance,
despite the fact that it was playing back at a different sampling rate and
underwent conversions between different sample rates in the process. If
I was you I would experiment with your sound on some different systems
before giving up. I guess sometimes practice confounds theory.

Best,

Chris.

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Re: [pd] 100000hz+

2006-10-26 Thread Chris McCormick
On Fri, Oct 27, 2006 at 06:54:27AM +0100, padawan12 wrote:
 
 This is as expected. What Chris says is no surprise. If you render the output
 to a .wav file it is captured as a snapshot and the sample rate no longer 
 has any effect (other than to change the overall playback rate). The problem
 others were trying to explain is that the synthesis patch is not independent
 of sample rate, so using the same Pd patch at different sample rates will
 produce different results. If you're recording it the problem doesn't exist.

I am not sure if I understand this distinction correctly. If I use Pd at
44100Hz to generate a high frequency wave that aliases, and save it as
a 44100Hz wave file, shouldn't that wave file be subjected to different
aliasing if I play it back at say 22050Hz? What about if I upsample it
to 96kHz? Will the aliasing weirdness disappear if the tone I played was
below 96kHz? Or is it somehow baked into the wav file. I think I am out
of my depth here.

Chris.

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