Re: [LAD] [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(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.