On 07/17/2011
10:41 AM, Rustom Mody wrote:
On Sun, Jul 17, 2011 at 1:21 PM, Philipp
Überbacher
<hollunder(a)lavabit.com>wrote;wrote:
Excerpts from Rustom Mody's message of
2011-07-17 05:33:44 +0200:
> I am preparing to give a talk on the wider ramifications of music.
> One of the things I wish to demonstrate is that things that look
different
> are merely analogs but at different scales.
>
> eg if something vibrates at 400Hz we hear a sound of A-flat. If it
> 'vibrates' at 4 Hz we hear a beat.
> In the same analogy a 2 vs 3 poly-rhythm (should?) change to a do-so
chord.
> And so on.
I suggest you do some experiments before you give a talk. At 4 Hz you
won't be able to hear anything, you won't even be able to reproduce a
4 Hz sound with common speakers.
You took me quite literally, [I did put the vibrate into quotes :-) ]
Let me spell out the experiment in more detail:
Say I have a rhythm in 4/4 time -- 4 even quarter notes, bar repeating
every
second played by say a click. [What kind of click I am not very sure;
sharp
with few harmonics would be best I expect]
Exactly. Just take a short audio-sample (aka grain) and trigger it
repeatedly. Increase the trigger freq. (aka grain-speed) from 4 Hz ->
400Hz.
Search the net for granular-synthesis. Your use-case is not the typical
grain-synth application, but the principle is the same.
Now if there were some (realtime) way of sliding
the tempo from 1 sec to
millisec I expect the separate clicks would vanish into a hum at some
stage.
This (and other such experiments) is what I want to demo.
Ive started looking at chuck.
How does it compare with puredata?
It's a bit of an apples vs oranges question.
the main difference: Chuck you program in text, pure-data you
graphically connect "objects" (if you know Max/MSP: pure-data is similar).
AFAIK, Chuck does not offer GUI elements - you'll need to implement the
slider via OSC or use a "text slider".
>> Is there some kind of software where I
can make a 4 Hz beat and pull a
>> slider or a freq text box entry until it sound like a A-flat note?
>
> puredata springs to mind, it's easy to use and has everything you need.
Indeed. Though chuck, supercollider, csound,... could all do the trick.
If you know neither of those. Pure-data is probably the easiest to get
started with.
http://www.timvets.net/video/grains.php will do what you want with Pd.
I'm not sure that does what he wants. He asked for a tool that takes an
existing signal/tone and then down tunes it. What you are suggesting
creates an emulation of that process but generates a completely new
signal/tone.
It would achieve a similar sound but is functionally quite a different
process.