Sorry for late response but i was looking a bit more to RavenPro and to your quite interesting fft/jitter tutorials on the share pages.
First i have to explain a little more why i want deep horizontal AND vertical resolution : i’m working on additive synthesis and would like to examine deep details in acoustics instruments sounds like bassoon, clarinets, contrabass, etc., to get inspiration on ways to reproduce them in a 200-harmonics-with-blur-factors-additive-synthesis expressive system for a two pens wacom screen. (see below**)
>> Oh, but you want both a great frequency AND a great time resolution.
Of course i don’t agree with this.
If building any sound by additive synthesis is virtually possible, then there must exist in the universe a way to decompose any sound, without anything missing.
option a :
“multi-resolution” in the way that Izotope explain, i’m not sure, but maybe with a 3D matrix, the third dimension representing 12 different fft sizes from 16 to 32768. Then, add or multiply (or something between) the 12 different planes of this third dimension.
option b :
Wavelet transform ? On the wikipedia page that i linked above, they say :
option c :
Playing with sampling rate ? Well i fell that if you do upsampling, the frequency resolution should go down, and when you downsample, then the frequency resolution goes up …for the preserved low frequencies. (Plus an other idea for high frequencies then, not sure : highpass filter > freqshift~(down) > downsampling => better frequency resolution for high frequencies too ?)
I’m not sure, maybe a mix between option a and option c. Hum, un peu une usine Ã gaz… (french expression, literally: i bit like a gas factory)
Anyway, cool to read people interested by this topic,
** About additive synthesis for a good imitation of natural sounds : i want to clearly understand exactly where, in the period of the waveform, is the energy of which frequencies, and how all this change in time during the attack and the sustain of the sound : Trying with my example “funny_additive-synth” ( http://cycling74.com/forums/topic.php?id=25102 ), i see that the phase information is dramatically important for low frequency instruments (less important on high frequency instruments) Also, I’d like to see, for a soft violin for example, how blurred the harmonics are, and which ones, etc. (additive synthesis from resonators can make some interesting blurred harmonics : mp3 example in: http://cycling74.com/forums/topic.php?id=20980 )
P.S : “million pixels” view : it was only a way of speaking, i didn’t mean “one million frequency bins”, i think 16384 or 32768 would be enough.
Mar 23, 2010 at 3:14am #176910