Re: [LAU] from 4 to 400 Hz

On 07/17/2011 10:41 AM, Rustom Mody wrote:
> On Sun, Jul 17, 2011 at 1:21 PM, Philipp Überbacher
> <hollunder@email-addr-hiddenwrote:
>
>> 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.

HTH,
robin

>> Regards,
>> Philipp
>>
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Received on Sun Jul 17 16:15:02 2011