In the case of the circle I could just use one of the tables, since one has the cosine and the other the sine, and output that as an oscillator, but if I want to combine functions to create shapes, e.g. one function for the x axis and another for y, how can I combine these two dimensions in one? I don't really get what you mean by (x,y)->x or (x,y)->y, or the equation you wrote (tried it but didn't sound as expected, maybe my implementation was wrong).
On Thu, Jan 30, 2014 at 6:06 PM, Charles Z Henry <czhe...@gmail.com> wrote: > You don't want fft~/ rifft~ for that. It's a mapping between large > structures on blocks and single-samples (and vice-versa). > > To get a single sinusoid from a path-defined circle, you just project onto > a single dimension. For example, (x,y)->x or (x,y)->y or (x,y)-> > (sqrt(3)/2*x+1/2*y). In the case of a circle, all the axes you would draw > through the circle work equally well. > > Chuck > > > > > > On Wed, Jan 29, 2014 at 2:44 PM, Alexandros Drymonitis > <adr...@gmail.com>wrote: > >> Yeah, well I'm trying to create shapes in Gem (say a circle) and create >> the sound they make. So, to make a circle, I'm making a ramp from 0 to 1, >> multiply it by 2pi and send it to [cos] and [sin] and store these values in >> two tables, which I then read for every instance of a [circle] (using >> [repeat] and [separator]). So, since for any shape, you need two >> coordinates, x and y, my thought was to use these two coordinates as the >> real and imaginary part of an FFT, merging the two dimensions in one. >> After the sinusoid, I'll try to make other shapes too, but I wanted to >> start from that to make sure that I hear exactly what I see. >> >> >> On Wed, Jan 29, 2014 at 10:30 PM, Charles Z Henry <czhe...@gmail.com>wrote: >> >>> What you seem to be doing is creating a spectrum which has magnitude 1 >>> everywhere, and the phase is varying at a constant rate vs frequency. That >>> means it has a constant group delay. >>> >>> So... my guess is that you'd get an impulse in each block, whose timing >>> depends on the rate of the phasor. When you vary the phasor frequency, it >>> will coincide with the peak of the hann window at some point and be its >>> loudest. >>> >>> Should be a periodic complex tone. I don't understand your goal: >>> you've got sinusoids in the patch... to generate sinusoids? >>> >>> Chuck >>> >>> >>> On Wed, Jan 29, 2014 at 9:12 AM, Alexandros Drymonitis <adr...@gmail.com >>> > wrote: >>> >>>> Say I have a full sine and a full cosine cycle stored in two tables. >>>> I'm trying the following to get a sinusoid from [rifft~] but it doesn't >>>> work. >>>> >>>> [phasor~] >>>> | >>>> [*~ sizeOfTable - 3] >>>> | >>>> [+~ 1] >>>> |\ >>>> | \ >>>> | [tabread4~ sine] >>>> | \ >>>> [tabread4~ cosine] >>>> | \ >>>> [rifft~] >>>> | >>>> | [tabreceive~ hann] >>>> | | >>>> [*~ ] >>>> | >>>> [/~ 1536] >>>> >>>> I've set the block size to 1024 in this subpatch, and there's a hann >>>> window in the parent patch as well. The tables have three guard points, >>>> that's why I'm multiplying [phasor~] by the size of the table minus three >>>> and then add one. >>>> The output of this is a waveform with very low amplitude that kind of >>>> bounces up and down within a sine like mask. Don't know if I'm making my >>>> self clear. My main question is, how do you get a sinusoid out of a sine >>>> and a cosine? Also, what's wrong in my approach? >>>> >>>> _______________________________________________ >>>> Pd-list@iem.at mailing list >>>> UNSUBSCRIBE and account-management -> >>>> http://lists.puredata.info/listinfo/pd-list >>>> >>>> >>> >>> _______________________________________________ >>> Pd-list@iem.at mailing list >>> UNSUBSCRIBE and account-management -> >>> http://lists.puredata.info/listinfo/pd-list >>> >>> >> >
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