[music-dsp] Sweeping tones via alias-free BLIT synthesis and TRI gain adjust formula

2013-05-14 Thread Marco Lo Monaco
Hello guys, I have been working on some scripts for generating BLIT analog waveform and I get quite good results even with ideal integration for steady frequency signals. I only notice a problem in compensating the DC offset of the second integration in the TRI generation expecially at high freqs

[music-dsp] R: Sweeping tones via alias-free BLIT synthesis and TRI gain adjust formula

2013-05-18 Thread Marco Lo Monaco
, making the solution less attractive at higher frequencies… Nigel On May 17, 2013, at 2:29 AM, Marco Lo Monaco marco.lomon...@teletu.it wrote: Thank you Nigel. Well my synth has strict specs, and of course wavetable is a solution. My mem usage computation was related to have perfectly

[music-dsp] R: Effects paradigms

2013-10-10 Thread Marco Lo Monaco
Hi Stephen, I would also suggest you the article from Dattorro in which explains modulation effects. Be warned that there is a mistake in the block scheme about the comb filtering used within, related t the dry and wet signal paths. https://ccrma.stanford.edu/~dattorro/EffectDesignPart1.pdf

[music-dsp] R: Trapezoidal integrated optimised SVF v2

2013-11-08 Thread Marco Lo Monaco
Hi guys, the work that Andrew did is of course a classic way to implement discretization of any analog filter by not considering any s-domain analysis, but discretizing directly from time domain differential eqs. I think it is useful for people here not having a Master's degree education to review

[music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-09 Thread Marco Lo Monaco
Hi Andrew, I think it's useful for everyone, and especially those wanting to handle non-linearities or other music behaviour. Yes, but people who are working in this field and doing virtual analog have known these tricks for at least 10 years ago. :) Being in the linear modeling field, I would

[music-dsp] R: R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread Marco Lo Monaco
v2 On 10 November 2013 18:43, Marco Lo Monaco marco.lomon...@teletu.it wrote: if you look at Yeh's work you can have an idea. The (D)KMethod is a generalization/extension of the state space ABCD approach to analog systems. Vadim's and Andrew are basically the same thing and the inversion

[music-dsp] R: Time Varying BIBO Stability Analysis of Trapezoidal integrated optimised SVF v2

2013-11-11 Thread Marco Lo Monaco
Hi Ross/Andrew, I couldnt wait to put my hands on it :) (the creativity/curiosity spark is always lit) Here is my MuPad notebook : https://www.dropbox.com/s/er1s0aeheuv3igg/VCF-StateVariableFilter.pdf I basically demonstrate what I already said in my previous posts. The standard state-space

[music-dsp] R: Trapezoidal integrated optimised SVF v2

2013-11-11 Thread Marco Lo Monaco
Hi Dave, Agreed on Vadim's interpretation of the mktg gimmick about the zdf/whatever acronyms (btw: it took me a while to understand the 0df wasnt a hex number!!! :) ) As I already told in my previous post, according to my knowledge the free delay loop (which implies instantaneous feedback) term

[music-dsp] R: A rephrasing of some of my sampling theory related concerns

2013-11-13 Thread Marco Lo Monaco
Dave, that image of you yelling °FEEDBACK° in such a funny way made my day, thanks! :))) M. -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] Per conto di vadim.zavalishin Inviato: martedì 12 novembre 2013 18:22 A: A discussion

[music-dsp] R: Implicit integration is an important term, ZDF is not

2013-11-14 Thread Marco Lo Monaco
Hi Max, the uniquess is granted by the Dini's theorem which is satisfied always in common practical analog schematic (unless you are dealing with some exotheric Chua's multiple DC operating points). That condition is met if det(Jnl*K-I)!=0 where Jnl is the Jacobian of the MIMO non linearity

[music-dsp] R: R: R: Implicit integration is an important term, ZDF is not

2013-11-16 Thread Marco Lo Monaco
component examples, then you would have non-uniqueness with the backward Euler method. Or, are you effectively saying that you can't possibly build such a circuit out of the components you mention? Max On 14 November 2013 20:20, Marco Lo Monaco marco.lomon...@teletu.it wrote: Hi Max, you need

[music-dsp] R: R: R: R: Implicit integration is an important term, ZDF is not

2013-11-16 Thread Marco Lo Monaco
hold, but I'm not sure if you can always make the 'right' choice of branch in every case - there may be situations where you have to 'hop branches' so to speak. I think it gets quite difficult then. Cheers Max On 16 November 2013 10:40, Marco Lo Monaco marco.lomon...@teletu.it wrote: Yes Max, it has

[music-dsp] R: R: R: R: R: Implicit integration is an important term, ZDF is not

2013-11-16 Thread Marco Lo Monaco
then. Cheers Max On 16 November 2013 10:40, Marco Lo Monaco marco.lomon...@teletu.it wrote: Yes Max, it has been for 10 years that I have been intrigued by this approach :) AFAIK there is no electronic component among the ones I mentioned that can realize a Fnl(x) = x^2 nonlinearity

[music-dsp] R: Best way to do sine hard sync?

2014-02-26 Thread Marco Lo Monaco
Hello Tobias, following Ross advice one of the drawback that you will have to deal is the CPU usage at high master frequencies. Placing in an overlap and add fashion a grain is very convenient at low freqs but not so much at high. More over you will have to deal with some sort of DC offsets on the

[music-dsp] R: Best way to do sine hard sync?

2014-02-26 Thread Marco Lo Monaco
yup that was the BLIT stuff, i think, so a sawtooth is the integral if this BandLimited Impulse Train (with a little DC added). Ahaha, funny! Did you set sarcasm mode = on? :))) Ciao Robert Marco -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code

[music-dsp] R: R: R: Best way to do sine hard sync?

2014-02-26 Thread Marco Lo Monaco
- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] Per conto di robert bristow-johnson Inviato: mercoledì 26 febbraio 2014 17:44 A: A discussion list for music-related DSP Oggetto: Re: [music-dsp] R: R: Best way to do sine hard sync? On 2/26/14 10:49 AM, Marco Lo

[music-dsp] R: R: R: R: Best way to do sine hard sync?

2014-02-26 Thread Marco Lo Monaco
febbraio 2014 19:15 A: A discussion list for music-related DSP Oggetto: Re: [music-dsp] R: R: R: Best way to do sine hard sync? On 2/26/14 12:37 PM, Marco Lo Monaco wrote: Moreover in my experience BLIT with leaky integrators fails on frequency modulations, i can imagine why. it's sorta like how some

[music-dsp] R: R: R: R: R: Best way to do sine hard sync?

2014-02-26 Thread Marco Lo Monaco
/14 1:55 PM, Marco Lo Monaco wrote: Actually I can do a filter with time varying filter at audio rate with _NO_ glithces or artifacts, stable (essentially behaving like an analog one). you're not the only one that can do that. but, with an IIR, there are problems that arise and must be dealt

[music-dsp] R: R: R: R: R: R: Best way to do sine hard sync?

2014-02-26 Thread Marco Lo Monaco
TIIR and resampling might both be JOS, but otherwise they're not the same thing. resampling is Julius and Gossett and TIIR is Julius and Wang. Oh man. It was a long time ago that I looked on TIIR and I have been more used to JOS resampling in the last years. I basically confused the idea of TIIR

[music-dsp] R: Iterative decomposition of an arbitrary frequency response by biquad IIR

2014-03-03 Thread Marco Lo Monaco
Thanks Peter, that sounds interesting, have you ever tried DE on filter estimation? M. -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] Per conto di Peter S Inviato: lunedì 3 marzo 2014 13:04 A: A discussion list for

[music-dsp] R: Iterative decomposition of an arbitrary frequency response by biquad IIR

2014-03-03 Thread Marco Lo Monaco
Stefan/Uli I use Scilab and there is not so much as in MAtlab for filter estimation. My experience with Scilab's invfreqz (which is based on the Levi paper I think) was always deluding for practical analog filter identification, but I bet I was unlucky or I didnt get the point of how to use it

[music-dsp] R: Iterative decomposition of an arbitrary frequency response by biquad IIR

2014-03-05 Thread Marco Lo Monaco
Ciao Greg, any chances to download your paper somewhere? I am also interested in it :) Thanks Marco -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] Per conto di gjberc...@charter.net Inviato: martedì 4 marzo 2014 20:14 A:

[music-dsp] R: Best way to do sine hard sync?

2014-03-10 Thread Marco Lo Monaco
Hello Tobias, You should also have a look at the BLOO method, explained in this thread a long time ago http://music.columbia.edu/pipermail/music-dsp/2009-june/067853.html That thread is quite long and the discussion pretty animated but you could get some new ideas from the the paper of George at

[music-dsp] R: The Uncertainties in Frequency Recognition

2014-03-12 Thread Marco Lo Monaco
Cool! I hadn't seen that name before--also it has a nice formula :) I'll read more later. Hey Robert, that's where the sincM formula (I told you about) comes from and that's how BLIT was cranked down by Stilson using that approach. The idea of convolving the Dirichlet kernel with many

[music-dsp] R: Simulating Valve Amps

2014-06-25 Thread Marco Lo Monaco
RBJ: for the specific examples discussed in this thread, and for a modest sampling grid resolution. If that number seems preposterous, perhaps consider the curse of dimensionality. Things that work great in 2 or 3 dimensions can become astronomically complex in 10+ dimensions. well, for

[music-dsp] R: R: R: Simulating Valve Amps

2014-06-25 Thread Marco Lo Monaco
i am most concerned about Miller capacitance and the bypass capacitance in parallel with the cathode resistor. All the paths leading to the bipole ports not directly connected to independent electrical sources imply analog feedback, which is dynamic if there are reactances

[music-dsp] R: R: R: Simulating Valve Amps

2014-06-26 Thread Marco Lo Monaco
Hi Steffan, A model is as good as you understand your subject. The problem with the tube equations from Norman Koren is, that they don't account for grid current. Having done some live investigation in tube amps, my conclusion is, that grid currents contribute largely to the operation of a

[music-dsp] R: Release pyo 0.7.2 (Python dsp library)

2014-10-18 Thread Marco Lo Monaco
Hello Sampo, Oliver, RBJ -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp- boun...@music.columbia.edu] Per conto di Sampo Syreeni Inviato: venerdì 17 ottobre 2014 23:51 A: A discussion list for music-related DSP Oggetto: Re: [music-dsp] Release pyo

[music-dsp] R: magic formulae

2014-11-27 Thread Marco Lo Monaco
Yes I agree with Tito. It looks like a A New Kind Of Music :P M. -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp- boun...@music.columbia.edu] Per conto di Tito Latini Inviato: giovedì 27 novembre 2014 17:09 A: A discussion list for music-related DSP

[music-dsp] R: LLVM or GCC for DSP Architectures

2014-12-09 Thread Marco Lo Monaco
Hello Stefan, if you want to make your own audio dsp toolkit compatible with the SHARC family you should consider maybe a spinoff of your projects, or not supporting at all the compatibility with it (at least being a mess to support it easily without headaches and cross-compilation issues) because

[music-dsp] R: Sallen Key with sin only coefficient computation

2014-12-21 Thread Marco Lo Monaco
Hello Robert, I did a similar analysis months ago on the SVF topology Andrew posted at that time. The implicit (and most logical) convention is to consider the OTAs as output current generator (as they should, so that a current flows into the cap), the unity/k/mo0/m1/m2 gains as having infinite

[music-dsp] R: R: Sallen Key with sin only coefficient computation

2014-12-23 Thread Marco Lo Monaco
Hi Robert, okay, that acronym could use a little bit of definition: http://en.wikipedia.org/wiki/Operational_transconductance_amplifier . we used to just call them transconductance amplifiers (or, more fundamentally, a voltage-controlled current source) back in the olden daze. the symbol

[music-dsp] R: R: Sallen Key with sin only coefficient computation

2014-12-24 Thread Marco Lo Monaco
Agreed. And also, let's measure lengths in inches/yards/miles.ehhm...ooops! :))) -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp- boun...@music.columbia.edu] Per conto di Stefan Stenzel Inviato: mercoledì 24 dicembre 2014 09:51 A: A discussion

[music-dsp] R: Two pole one zero biquad filter

2015-02-06 Thread Marco Lo Monaco
Nicely done, Peter and thanks for sharing. I was the one who suggested to be super-clear and void any doubt in us judging your results, because via email and with no paper published that should be not ever an ultimate argument in the discussion. I never thought that you could be cheating on your

[music-dsp] R: R: Thoughts on DSP books and neural networks

2015-02-05 Thread Marco Lo Monaco
...@music.columbia.edu] Per conto di robert bristow-johnson Inviato: venerdì 6 febbraio 2015 01:10 A: music-dsp@music.columbia.edu Oggetto: Re: [music-dsp] R: Thoughts on DSP books and neural networks On 2/5/15 6:48 PM, Marco Lo Monaco wrote: I dont know very much about US IP laws but in Italy (EU), reverse

[music-dsp] R: Thoughts on DSP books and neural networks

2015-02-05 Thread Marco Lo Monaco
Ethan, I dont know very much about US IP laws but in Italy (EU), reverse engineering in illegal unless for interoperability issues. You can understand an algorithm only by measuring in-out relationships (very difficult to understand the details of an algo by only doing this), but no decompiling or

[music-dsp] R: Thoughts on DSP books and neural networks

2015-02-05 Thread Marco Lo Monaco
Hello Peter, I would rather get an IR from a SPAN plugin like the Voxengo on a real stimulus signal (say noise or impulse). That gives more the idea that it's a real context and not just a formula with possible cheating (i.e. if you have discovered the perfect filter with no warping and

[music-dsp] R: Geographical visualization of music-dsp list participants

2015-02-11 Thread Marco Lo Monaco
Hi Peter, my hit was from San Diego, but it actually should be from Italy (near Venice). When I will be back home in a week or so I will click again to update the map. :) It's also nice to see, depending on the world location, how I can recognize some authors in the dsp literature living in those

[music-dsp] R: Glitch/Alias free modulated delay

2015-03-21 Thread Marco Lo Monaco
That's exactly what I would also suggest! The linear interpolation is used in commercial products more than one could think. -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp- boun...@music.columbia.edu] Per conto di Nigel Redmon Inviato: sabato 21

[music-dsp] R: Glitch/Alias free modulated delay

2015-03-20 Thread Marco Lo Monaco
How often do you update the LFO? Every buffersize (32/64 samples)? M. -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu [mailto:music-dsp- boun...@music.columbia.edu] Per conto di Nuno Santos Inviato: venerdì 20 marzo 2015 19:06 A: A discussion list for music-related

[music-dsp] R: Geographical visualization of music-dsp list participants

2015-04-23 Thread Marco Lo Monaco
Hello Peter, I remember I clicked on your links when I was in San Diego, but actually my place is near Venice, which is missing on the maps. Just to let you know other weird cases not listed in your emails. M. -Messaggio originale- Da: music-dsp-boun...@music.columbia.edu

[music-dsp] R: Comb filter decay wrt. feedback

2015-05-11 Thread Marco Lo Monaco
we should have a drink together (do you come to U.S. AES shows?) and all you do is mention one of several political topics and the hyperbole coming outa me will be worse than this. Hey, I also wanna have a drink with RBJ and talk about life, politics, women and DSP?!?!?!! Even if there is

[music-dsp] R: R: Comb filter decay wrt. feedback

2015-05-12 Thread Marco Lo Monaco
@music.columbia.edu Oggetto: Re: [music-dsp] R: Comb filter decay wrt. feedback On 5/11/15 3:25 AM, Marco Lo Monaco wrote: we should have a drink together (do you come to U.S. AES shows?) and all you do is mention one of several political topics and the hyperbole coming outa me will be worse than

[music-dsp] R: recursive SIMD?

2015-04-15 Thread Marco Lo Monaco
If you are looking for an example of IIR filter implementation, it is actually possible and under some restrictions even if the benefit arises only for a large order (which is rarely used in audio). The main problem is that there is no instruction AFAIK that can sum up all the float in the 4

[music-dsp] R: Compensate for interpolation high frequency signal loss

2015-08-17 Thread Marco Lo Monaco
Talking about the all-pass modulation, (and also reconnecting to a past hot post about time varying filters), did anyone tried the following: 1) see if the allpass passes the minimum norm criterion that Laroche introduced (maybe the 5 samples transient found in the paper for a in the range

[music-dsp] R: R: Re: The Art of VA Filter Design book revision 1.1.0

2015-07-25 Thread Marco Lo Monaco
Unless you consider the papers by Mitra et alias, but dealing only with linear graphs computability…which are dated effectively in the 70s. M. Da: music-dsp [mailto:music-dsp-boun...@music.columbia.edu] Per conto di Marco Lo Monaco Inviato: sabato 25 luglio 2015 01:31 A: music-dsp

[music-dsp] R: Re: The Art of VA Filter Design book revision 1.1.0

2015-07-25 Thread Marco Lo Monaco
12:42 (GMT-08:00) A: music-dsp@music.columbia.edu Oggetto: Re: [music-dsp] The Art of VA Filter Design book revision 1.1.0 On Jul 25, 2015, at 12:25 AM, Marco Lo Monaco marco.lomon...@teletu.it wrote: Also you tell us that the delay free loop problem was initially faced in the 70s, which

[music-dsp] R: Re: NAMM Meetup?

2016-01-19 Thread Marco Lo Monaco
I will be there by friday. Where do we gather exactly? Marco Inviato dal mio dispositivo Samsung Messaggio originale Da: Nigel Redmon Data: 19/01/2016 07:03 (GMT+01:00) A: A discussion list for music-related DSP

[music-dsp] R: Re: NAMM Meetup?

2016-01-23 Thread Marco Lo Monaco
> Cheers > Christian > > Am 19.01.2016 um 00:41 schrieb Marco Lo Monaco <marco.lomon...@teletu.it>: > >> I will be there by friday. Where do we gather exactly? >> >> Marco >> >> >> >> Inviato dal mio dispositivo Samsung >> &

[music-dsp] R: R: Anyone using unums?

2016-04-15 Thread Marco Lo Monaco
system that represents 256 different values -- seems like a reasonable requirement to me! -- you need 2^256 bits to represent a general SORN. Whoops! But of course he bounces on to a different topic before the obvious problem comes up. -Ethan On Fri, Apr 15, 2016 at 4:38 AM, Marco Lo

[music-dsp] R: Anyone using unums?

2016-04-15 Thread Marco Lo Monaco
I read his slides. Great ideas but the best part is when he challenges Dr. Kahan with the star trek trasing/kidding. That made my day.Thanks for sharing Alan Inviato dal mio dispositivo Samsung Messaggio originale Da: Alan Wolfe Data: 14/04/2016