Re: [music-dsp] Is beating the same thing as flanging?

2010-11-22 Thread Theo Verelst
very much... Theo Verelst http://www.theover.org/Audio/index2.html -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo

Re: [music-dsp] A wavetable alternative to adjusting the frequencies of harmonics to get seamless loops.

2010-12-23 Thread Theo Verelst
is provably dull in no time, and that shows as listening fatique easily. And I agree wavetables are great fun, but of course it's hardly a *new* science... So I am much for the spirit of the Open Source to keep saying what is what, unless of course commercial patents get in the way... Theo Verelst

Re: [music-dsp] Interpolation for SRC, applications and methods

2010-12-29 Thread Theo Verelst
.have the big scary beasts finished their territory skirmish now. Why did you hear the big machine gun kill the actual monster yet ? I didn't. -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links

Re: [music-dsp] Interpolation for SRC, applications and methods

2010-12-29 Thread Theo Verelst
Hi, I loooked up the aes workshop link about past system design http://www.aes.org/events/125/workshops/session.cfm?code=W5 I even recognize one of the speakers from the AES conference in Amsterdam last year (or the year before, I forgot) but I don't see a link to some recording of the

Re: [music-dsp] a multiband compression experiment

2011-02-10 Thread Theo Verelst
with. Theo Verelst -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp

Re: [music-dsp] adaptive filter pitch detection?

2011-02-20 Thread Theo Verelst
and interacted with off and on the internet, I don't think at least that *I* feel that's a language barrier. Theo Verelst http://www.theover.org/Synth -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links

Re: [music-dsp] Precise, Real Time Pitch Shift with Formant Control

2011-08-04 Thread Theo Verelst
science, when that in fact has already taken place, and was of much higher (EE) standards. This only to point at some possible errors and promoting the un-hyped talk about the quality of all kinds of algorithms as a normality which is far from the standard model in physics for instance. Ir. Theo

[music-dsp] Electrical Engineering Foundations

2011-08-24 Thread Theo Verelst
), even physics and other disciplines or people making their hobby a profession this might all just as well be abacadabra, and it seems to me this should change. Regards, Theo Verelst -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list

Re: [music-dsp] music-dsp Digest, Vol 92, Issue 7

2011-08-25 Thread Theo Verelst
Put on the prof hat :) That's asking a lot, I'll see what I can do. When I was at Delft University ( the top tech uni in the Netherlands and at normal western top at the time) I used to (as a student) do practicum assistance, for electronics practica (most often for physicists). That's a

Re: [music-dsp] Electrical Engineering Foundations

2011-08-26 Thread Theo Verelst
I took the issue in Theo's post to be that many important foundational concepts are whizzed over. Right. 'Tis the age old breadth vs depth chestnut again. I suppose that refers to some interpolating IT-type scheme. Human beings shouldn't be pro-active little machines with methods in my

Re: [music-dsp] Electrical Engineering Foundations

2011-08-27 Thread Theo Verelst
I've made a small beginning at http://www.theover.org/Dsp . Feel free to comment/request/fire question, etc, in fact I don't even mind making it a Wiki page (to let other contribute), and I don't know yet how many linked pages and example materials I'll make. Theo -- dupswapdrop -- the

Re: [music-dsp] FM Synthesis

2011-09-15 Thread Theo Verelst
I was quite non-professionally (in both meanings) doodling with Maxima and got back to where I was in lke 1985 too, to thing about what the right Frequency Modulation definition might be, for instance: is it more phase-distortion (modulation), or, when it is actually the frequency which

Re: [music-dsp] Splitting audio signal into N frequency bands

2011-11-02 Thread Theo Verelst
that it was (wrongly) considered OK to make all MSc engineers bachelors EEs first) stupid example Include sampling considerations for the above and qualitative describe the effect of a too low sampling frequency Theo Verelst -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source

Re: [music-dsp] Orfanidis-style filter design

2011-12-08 Thread Theo Verelst
robert bristow-johnson Sun Nov 27 17:29:14 EST 2011 wrote: On 11/27/11 3:17 PM, Dominique Würtz wrote: Any ideas? Knud Christensen A Generalization of the Biquadratic Parametric http://www.aes.org/e-lib/browse.cfm?elib=12429 Hmm, reading the abstract I'm not 100% sure... why not

[music-dsp] Orfanidis-style filter design

2011-12-08 Thread Theo Verelst
and pay for it, but if the cost is $20 (for non-members), they cannot expect a lot of compliance. Hmm, I suppose it's like the discussion on HD Tracks selling high quality copyrighted materials outside of the US: some rules have to be made, even though they might not mind _some_ copying and

Re: [music-dsp] Orfanidis-style filter design

2011-12-09 Thread Theo Verelst
will prevail leaving the good, talented and nice working people with shitty A/V materials and little income. Ir. Theo Verelst http://www.theover.org/Prod/studiosound.html -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews

Re: [music-dsp] PhD thesis on musical instrument sound morphing (Marcelo Caetano)

2011-12-14 Thread Theo Verelst
synthesizer, don't sound very convincing, but then again given the enormous size of the Vienna libraries, picking three basic renaissance instruments is indeed a very limited examples space. Theo Verelst -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code

Re: [music-dsp] PhD thesis on musical instrument sound morphing (Charles Henry)

2012-01-01 Thread Theo Verelst
a vocation tests' psychological profile section by associating too much with dungeons and murder weapons combined with desires for activities with women tired of life... Theo Verelst -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list

Re: [music-dsp] anyone care to take a look at the Additivesynthesis article at Wikipedia?

2012-01-11 Thread Theo Verelst
Without looking at the page (I might do that later), I remember from doing a few good edits which sometimes were deliberately changed that of course the process of the wiki use has turned from good quick facts (wikiwiki appears to mean quickly) to a battle with spammers and strangely inspired

Re: [music-dsp] music-dsp Digest, Vol 97, Issue 23

2012-01-19 Thread Theo Verelst
music-dsp-requ...@music.columbia.edu wrote: from 30 to 60 or so for an expert EA concert presentation Huh? I had a moderate quality cassette recorder in the 70s which had better normally measured properties than that... -- dupswapdrop -- the music-dsp mailing list and website: subscription

Re: [music-dsp] stereo-wide pan law?

2012-02-08 Thread Theo Verelst
, unless it concerns an extremely specialistic subclass. Just saying. Ir. Theo Verelst -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu

Re: [music-dsp] stereo-wide pan law?

2012-02-08 Thread Theo Verelst
Sorry, no proper EE background here tho. I'm just a math geek. :-) Auw man -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp

Re: [music-dsp] a little about myself

2012-02-22 Thread Theo Verelst
jack (Ladspa) based plugins are worth a listen: http://www.theover.org/Fpgasynth/beetho1.mp3 44.1kHz 256 kb/s stereo mp3, ca. 30MB ( Original thread: http://rubidium.dyndns.org/pipermail/fpga-synth/2012-February/002047.html ) Theo Verelst -- dupswapdrop -- the music-dsp mailing list

Re: [music-dsp] google's non-sine

2012-02-23 Thread Theo Verelst
What's the challenge being met by Google with their wavy lines? It clearly isn't a graphics problem, nor a particularly good synthesis engine being promoted (the page with the application is fun and maybe sound fun, but isn't put forward as the next big thing in audio). Neither is the graph

Re: [music-dsp] a little about myself

2012-02-23 Thread Theo Verelst
be be intelligible, I seriously doubt most home systems and most hobby studio systems ever get so loud. Probably it's more a certain transient or resonance/shear wave causing the unnatural ringing effect, and of course I'd like to stay way clear of that... Theo Verelst -- dupswapdrop -- the music-dsp

Re: [music-dsp] a little about myself

2012-02-24 Thread Theo Verelst
with only a few samples delay in between, that'll bring back the fun in synthesizers and effects, for sure! Ir. M. Theo Verelst http://www.theover.org/Synth http://www.theover.org/Fpgasynth -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list

Re: [music-dsp] music-dsp Digest, Vol 98, Issue 66

2012-02-25 Thread Theo Verelst
douglas repetto wrote Sat Feb 25 08:21:23 EST 2012: non-sinewave animation. Maybe I've just seen too many non-sines drawn by students who aren't being creative, they just don't get the difference (yet!) between two half-circles and a sinewave. Serious engineering students (who else wouldbe

Re: [music-dsp] a little about myself

2012-02-26 Thread Theo Verelst
Ross Bencina wrote at Sun Feb 26 06:33:11 EST 2012: signal(s). The zero crossing thing was a simple example. You could also think of algorithms that are not strictly signal based such as multi-rate counters etc etc. Without a full-blown programming language the compromises become unacceptable

Re: [music-dsp] a little about myself

2012-02-26 Thread Theo Verelst
On Feb 26, 2012, at 12:48 AM, Ross Bencina wrote: .. 1) music composition degree 2) computer science and/or software engineering degree 3) electrical engineering degree .. Hmm, software engineering would preferably be covered by EE, but of course there are differences in emphasis. And I

Re: [music-dsp] music-dsp Digest, Vol 98, Issue 92

2012-02-26 Thread Theo Verelst
I meant to speak in a slight scientific philosophical way as in to determine what the direction of the research in this specific group of people might be, referring to the more general logic of research or systematic IT behaviour I have often observed. But perhaps it depends on some very

Re: [music-dsp] high-level vs. low-level coding of algs

2012-02-27 Thread Theo Verelst
robert bristow-johnson wrote at Sun Feb 26 18:58:56 EST 2012: ... in my opinion, the optimal division of labor becomes obvious if your system modularizes specific low-level algs. when i worked at Eventide 2 decades ago, i thought that division of high level vs. level was pretty much

Re: [music-dsp] music-dsp Digest, Vol 98, Issue 102

2012-02-27 Thread Theo Verelst
Timing can be very accurately set (sub millisecond now I think) with a [metro] and all calculations work for message filtering, but yes, strictly you are right, the notion of message samplerate is meaningless in Pd. Some ideas: it is also of importance to be able to abstract from samples

Re: [music-dsp] very cheap synthesis techniques

2012-02-29 Thread Theo Verelst
in a (public ?) gallery which certainly interests me. Theo Verelst -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music

Re: [music-dsp] Job opening - physical acoustics

2012-03-29 Thread Theo Verelst
Somewhat, nice subject, I've done some physical modeling myself, and I know there are three (if I'm not mistaking) brands of musical instrument manufacturers making physical modeling piano's (Gem, Roland, Viscount). It surely is a big difference to use finite elements to confirm wind tunnel

Re: [music-dsp] A Studio Signal Enhancement Experiment

2012-03-29 Thread Theo Verelst
Thanks, Jerry. indicate that you are trying to recover some lost dynamics? I have looked at that subject in the past, expanding for instance CD recording to undo the huge and varied amounts of compression on these widely used household media. The subbands I use in the experiment I've

Re: [music-dsp] Fwd: job posting at Georgia Tech

2012-03-29 Thread Theo Verelst
Honestly I couldn't wait to come to America on a serious job (though preferably to California), but I seriously don't understand what music cognition means, in the presented context... Theo V. -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code

Re: [music-dsp] A Studio Signal Enhancement Experiment

2012-04-04 Thread Theo Verelst
For those interested in my signal processing thread: http://youtu.be/DSdRT7MM3gI I measured the output of the chain while playing some well known music with an improvised 30 band spectrum analyzer, and with an FFT based 1024 band analyzer, and put on the HD cam to capture some of the

Re: [music-dsp] Window presum synthesis

2012-04-20 Thread Theo Verelst
Hi The theoretical background probably most appropriate for the FFT (check out some Berkeley courses for instance , as I recall some woman there having a good web-cast about the subject) is the Electrical Engineering interpretation and (as I'm formally educated in) the Network Theory related

Re: [music-dsp] Window presum synthesis

2012-04-23 Thread Theo Verelst
And for people with a lot of time on their hands, we added the Sliding DFT version (analysis frame updated every sample) a few years ago - including a simple instance of frequency domain convolution for the windowing. A real-time version of this was presented at ICMC last year, running on a GPU.

Re: [music-dsp] To EE or not to EE (Was: Job at Waldorf and Possible Job Opportunity)

2012-05-08 Thread Theo Verelst
Being guilty of rather promoting the EE idea of course I have feelings or thoughts about the subject: I'd think like with IT type of subjects, the danger exists that the well founded and theoretically usually strong (university) EE subjects should be guarded against mis-use somewhat, to

Re: [music-dsp] Seminar: Listening and Learning Systems for Composition and Live Performance (by Nick Collins)

2012-06-07 Thread Theo Verelst
His tech literacy is contagious. And Barcelona is amazing. Well great, I'm sure I liked Barcelona too when I was there, but I can't help thinking how hard these people find it to make music in general, in the existing sense. I mean, how hard would the makers of this kind of scientifically

Re: [music-dsp] .wav file format conversion tools

2012-06-08 Thread Theo Verelst
I'm sure I have used a recent version of ffmpeg with obvious but maybe not out-of-the-build-archive build options to convert from 24 bit 192 to 16 bit floating point 44.1 KS/s mp3. For people on a recent machine with compiler that whole package takes what, 15 minutes to download and compile,

Re: [music-dsp] Pointers for auto-classification of sounds?

2012-06-11 Thread Theo Verelst
genetic engineering of synthesis patches. ok, that sounds like a potentially nice PhD. I'd wonder if the genetic algorithm or (as I studied a bit in the past,but never really worked on) the cohonen network learning from (which ?) examples can do simple thing like counting to 4 binary, or

Re: [music-dsp] _ Pointers for auto-classification of sounds?

2012-06-18 Thread Theo Verelst
Thinking about sound characterisation spaces I'd think an important existing studio space is the Loudness-Preparation space, where an FFT type FIR is used to hide equal loudness curve compensation sound-emphasis. Also, there is such a thing as a natural or good sound when it sounds

Re: [music-dsp] DC blocking (again :)

2012-07-30 Thread Theo Verelst
levels are the target, oh boy, that is complicated. Ir. Theo Verelst http://www.theover.org/Prod -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http

Re: [music-dsp] i need a knee (Bastian Schnuerle)

2012-08-10 Thread Theo Verelst
Hi, I think the hard part about this kind of subject is that the expectations from making a plugin or processing block aren't exactl in line with reality. I mean people will wonder what you want to achieve with your work, and I think you will have some idea, about what you want to achieve

Re: [music-dsp] ARM for DSP (Lubomir I. Ivanov)

2012-09-29 Thread Theo Verelst
The problem with optimizing the instructions working on a processor for DSP is that often the bandwidth for feeding the ALU or the FPU or FPU is limited. So you want to either have operations to be executed with a lot of local register data retention, or you must make sure you have memory

Re: [music-dsp] Software to make a binaural simulation of the movement of a sound source

2012-10-10 Thread Theo Verelst
I'm not sure I understand the whol question, but in general a moving sound source will create a Doppler effect, but I don't think what is being asked about. When doing binaural things, beware of the main break in the road that every human head has another shape and size, so unless it's a

Re: [music-dsp] Precision issues when mixing a large number ofsignals

2012-12-11 Thread Theo Verelst
I think you'll have to consider the difference between popularizing a scheme to get a reasonable sounding mix, probably by presuming certain self-correlation and sync issues in your input signals, and proper information theoretical theorems. I mean taking a random number of channels with

Re: [music-dsp] mechanisms that transfer of energy between modes in acoustic systems? (Ross Bencina)

2012-12-17 Thread Theo Verelst
Hi Ross, .. But aside from rattling couplings I'm wondering whether resonating objects exhibit energy migration between modes? if so, why/how? .. Unless you want to go pretty deep in the higher maths (or an interest of mine: theoretical phyics), it isn't hard to come up with examples of

Re: [music-dsp] crossover filtering for multiband application

2013-02-28 Thread Theo Verelst
About the multi band filtering: - *All* filtering you can do, either analog or digital, will inevitably have phase shifting as a consequence, no matter what people will try to tell you about correcting networks (check out the theory and preferably do your homework: ALWAYS is ALWAYS. And

Re: [music-dsp] crossover filtering for multiband application

2013-03-01 Thread Theo Verelst
... - *All* filtering you can do, either analog or digital, will inevitably have phase shifting as a consequence, no matter what people will try to tell you about correcting networks (check out the theory and preferably do your homework: ALWAYS is ALWAYS. wire? (or does that not count as

Re: [music-dsp] Efficiency of clear/copy/offset buffers

2013-03-11 Thread Theo Verelst
On Mar 9, 2013, at 9:23 PM, robert bristow-johnson rbj at audioimagination.com wrote: if it's a wavetable and you're doing linear interpolation, a simple trick is to copy x[0] to x[256] (make a 256 point wavetable a 257 element array) do the AND only for the first sample in the linear

Re: [music-dsp] Efficiency of clear/copy/offset buffers

2013-03-11 Thread Theo Verelst
A lot of the considerations of course have to do with trying to make maintainable, and therefore readable code. That's good, but it often is not all too clear what DSP constructs have to do with enums or digital logic definitions, even though of course the P in DSP is done by digital logic.

Re: [music-dsp] (no subject)

2013-03-26 Thread Theo Verelst
On Mar 24 13:09 robert bristow-johnson wrote: ... this zero-padding issue applied to overlap-adding is for fast convolution, using the FFT and iFFT to accomplish simple filtering with a possibly very long FIR filter. but it has to be FIR, not IIR. ... I guess in every case a filter can be

Re: [music-dsp] Synth thread timing strategies

2013-03-26 Thread Theo Verelst
It's not so easy nowadays to program a real time audio windows app, I think. It's been a long time since I've done such a thing, but think about it as that thread-switching, kernel heartbeat interrupts and buffering aren't what you're supposed to do much with. In general, one process

Re: [music-dsp] need help with gnuplot and octave on my mac

2013-04-02 Thread Theo Verelst
Hi Robert, I'm sure you may well know this yourself, the error message suggests your libfontconfig is not the version gnuplot requires, an maybe if there is such library file somewhere on the (I presume) OSX file system, maybe you could set an environment variable somewhere in the startup

Re: [music-dsp] need help with gnuplot and octave on my mac.

2013-04-04 Thread Theo Verelst
On Wed, 3 Apr 2013, robert bristow-johnson wrote: BTW, personal versions of Mathematica are $300 these days. maybe i should buy it and learn it. can i get a version that is friendly with my old G4 laptop? There's a (free) web version of mathematica as well, but without notebooks and

Re: [music-dsp] Logarithmic sweeps and FFT magnitude

2013-04-27 Thread Theo Verelst
Uli Brueggemann wrote Fri Apr 26 08:51:24 EDT 2013: I have three sweep signals with different start and end frequencies but identical length in time. The time signal has the same amplitude. I suppose you mean it's like taking a sweep-tone generator, presumably with a sine-wave output, and you

[music-dsp] My latest computer DSP signal path for audio improvements

2013-04-29 Thread Theo Verelst
Hi all, As some may know I've from some time now used Linux Ladspa/Jack plugins (and some other programs) to analize and improve good recordings (with A grade studio processing), and my latest iteration is worth sharing, for those interested: http://www.theover.org/Dsptst Anyone into

Re: [music-dsp] My latest computer DSP signal path for audioimprovements

2013-05-01 Thread Theo Verelst
Rob Belcham wrote: Hi Theo, Some wet / dry example audio would be interesting to hear. Cheers Rob .. OK, that should be reasonable. For this limited club (little over a hundred world wide ?) of people I suppose there's no real problem with a few very short (7 secs) examples from varied

Re: [music-dsp] My latest computer DSP signal path for audioimprovements

2013-05-01 Thread Theo Verelst
Thomas Young wrote: Link doesn't appear to be working I put it somewhere else, and within a few minutes found out and put it where the link points. -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links

Re: [music-dsp] My latest computer DSP signal path for audioimprovements

2013-05-01 Thread Theo Verelst
Thomas Young wrote: There is quite an audible loss of high end, it's especially noticeable on the 'double processed' example which sounds very low passed. Is that intentional? --- I think there are a number of issues here: 1) There's a deliberate (-3 dB or more) CD mid-cut in the

Re: [music-dsp] basic trouble with signed and unsigned types

2013-05-02 Thread Theo Verelst
Sampo Syreeni wrote: For the longest time I took out a compiler and started cranking out an old idea... In that vein, I'm using libsndfile and its (highly reasonable) processing model: you just keep everything to zero padded ints (preferably signed) and go from there. The trouble is that

Re: [music-dsp] My latest computer DSP signal pathfor audioimprovements

2013-05-02 Thread Theo Verelst
Rob Belcham wrote: Agreed. There is a lot more low end in the processed but the loss of the high frequencies is distracting. In some senses in most fragments there's more high, but not mid(-high), because of the FFT-ed high freq components over 12 kHz. Of course the volume is often

Re: [music-dsp] My latest computer DSP signal pathfor audioimprovements

2013-05-02 Thread Theo Verelst
Sampo Syreeni wrote: On 2013-05-02, Rob Belcham wrote: Agreed. There is a lot more low end in the processed but the loss of the high frequencies is distracting. ... Well, I wanted to make clear modern mixes on consumer materials are often messed up, and discuss that. I f your

[music-dsp] A little diversion: what audio equipment do you use to judge DSP quality ?

2013-05-04 Thread Theo Verelst
Ipod+earbuds, a Radio Shack HiFi system from the 90s? A nice modern surroud system or multimedia speakers, or maybe some of the modern monitors like KRK, Genelecs, or those fun JBLs with self-correction? Or maybe big studio monitors like Tannoy, Quested, BW, etc ? O audiophile systems, or a

Re: [music-dsp] A little diversion: what audio equipment do you use to judge DSP quality ?

2013-05-04 Thread Theo Verelst
Some serious considerations here, that's good in itself. I agree it sometimes almost looks as if some unknown entity must decide on what a given person must fine right, but luckily in the democratic west people may decide for themselves what is righteous and not in music. I agree there are

Re: [music-dsp] Functional Programming C code generation

2013-05-14 Thread Theo Verelst
pdowling wrote: i'm presuming everyone in this thread knows Grame's FAUST and Cycling 74's GEN ? or maybe i'm missing something about what you want to do? if so apologies. i'm actually just very interested in this subject myself. surely the first step would be to appraise two of the excellent

Re: [music-dsp] Functional Programming C code generation

2013-05-15 Thread Theo Verelst
For those interested, a short list of theoretical and general considerations, as of course some of you know I'm hardly fresh to all this, and recognize some of my PhD level considerations from long ago, which were about parallelizing (why does my spell check complain on this word ?! :) )

Re: [music-dsp] OWL Programmable FX Pedal

2013-05-30 Thread Theo Verelst
Martin Klang wrote: ... In short, it's a reprogrammable DSP stompbox, and it's open source / open hardware. ... Nice idea! I hope you get sufficient backing. Isn't 12 bit a biton the low side, or is that because mos DSP units do so much signal grunging that it doesn't make sense to go

Re: [music-dsp] Incudine support to forge Virtual UGens (Tito Latini)

2013-06-24 Thread Theo Verelst
Hi all, the last year I started to write Incudine, a heavy Music/DSP programming environment for Common Lisp on which sounds can be hammered and shaped. Would you mind explaining somewhat about the motivation for the scaffolds of YetAnotherAudioRenderingProgram ? I'm interested in

Re: [music-dsp] note onset detection

2013-08-07 Thread Theo Verelst
Ross Bencina wrote: On 7/08/2013 2:38 AM, Theo Verelst wrote: I suppose in EE terms, if you know something about the waves you're ... You would need a definition of note onset that somehow includes segmenting a hummed glide transition from one pitch to another according to Robert's

Re: [music-dsp] Effects paradigms

2013-10-04 Thread Theo Verelst
ChordWizard Software wrote: Hi all, I'm wondering if someone can point me to some good background articles that illuminate what is happening to the signal with common effects such as reverb, chorus, flanger, etc. ... Any pointers much appreciated. Hello Stephen, It's a long history that

Re: [music-dsp] PSOLA pitch shifting - resample or not?

2013-10-25 Thread Theo Verelst
Thilo Köhler wrote: Hello All! Resampling = pitching all frequencies including Formants, Well, that's not really an mathematical equivalence, like the theoretical resampling theorem. Think about the incredible inaccuracies of bin-measuring frequencies (up to over 50% approximating the

Re: [music-dsp] PSOLA pitch shifting - resample or not?

2013-10-25 Thread Theo Verelst
Ross Bencina wrote: Hi Guys, It seems to me that the missing link here is recognising the theory behind this approach: The idea is to isolate each vocal tract filtered glottal pulse in its own grain (i.e. glottal pulse convolved with the impulse response of the vocal tract). Thus changing the

Re: [music-dsp] PSOLA pitch shifting - resample or not?

2013-10-27 Thread Theo Verelst
About the resampling issue: I understand fine what it ism I just don't agree with the way in which terminology suggests to be in favor of a certain solution.this speech coding theory is from the 70s/80s, when speak and spell was popular, and was aimed probably mostly at encoding speech

Re: [music-dsp] family of soft clipping functions.

2013-10-29 Thread Theo Verelst
robert bristow-johnson wrote: at the last AES in NYC, i was talking with some other folks (that likely hang out here, too) about this family of soft clipping curves made outa polynomials... Th script you supplied worked fine with the Open Source (and free) Octave as well, and gives this

Re: [music-dsp] family of soft clipping functions.

2013-10-29 Thread Theo Verelst
robert bristow-johnson wrote: x g(x) = integral{ (1 - v^2)^N dv} 0 you figger this out using binomial expansion and integrating each power term. Maybe a nice worksheet of (wx)Maxima, the FOS algebraic manipulation programs:

Re: [music-dsp] family of soft clipping functions.

2013-10-30 Thread Theo Verelst
Hi For whoever follows this, I thought and worked a bit about the clipping idea, and especially I was thinking about the harmonic behavior of the clipping function of N degree, so i tried using Maxima, and found there are distinct harmonics added to a sine wave passing through it. Maybe this

Re: [music-dsp] IIR Coefficient Switching Glitches

2013-11-03 Thread Theo Verelst
Ove Karlsen wrote: A linear smoother might fix some issues, on filters that are sensitive to fast changes. Also for filters that seems to work fine with EQs, highpasses, my own Minimal-phase IIR Gaussians work fine (Beneficient Open-Source Licence). Variable order up to 9th, and variable

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

2013-11-06 Thread Theo Verelst
Andrew Simper wrote: Here is an updated version of the optimised trapezoidal integrated svf which bundles up all previous state into equivalent currents for the capacitors, which is how I solve non-linear circuits (although this solution is just the linear one that I'm posting here). The only

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

2013-11-07 Thread Theo Verelst
Andrew Simper wrote: On 6 November 2013 22:13, Theo Verelst theo...@theover.org wrote: That's a lot of approximations and (to me !) unclear definitions on a row. Ok, please let me know the first one you don't understand and I'll break it down for you! The only approximation made

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

2013-11-07 Thread Theo Verelst
Phil Burk wrote: Dear Theo, I found Andrew's postings to be very interesting and helpful. . Fine. He insulted run of the mill academic EE insights from decades ago, i merely stated facts, which should be respected, but here are still not. The theory is quite right, and I've taken the

[music-dsp] A short network theory remark

2013-11-08 Thread Theo Verelst
Hi list I'm sorry I left a little completely unfinished sentencd in one of my recent messages, so here it goes with a little explanation. In the honorable sports of electrical engineering (both bachelor level and MSc level firsts year) Network Theory used to be known as the theoretical, but

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

2013-11-08 Thread Theo Verelst
Just a short suggestion: the field at hand has been acknowledged to be let's say classic (for the sake of decorum) EE subjects, which at the time were hard to do, and interesting a integration POV. Of course I agree that even people, for instance without the luck of having been born in 1st

[music-dsp] Analog versus digital systems

2013-11-10 Thread Theo Verelst
Hi all, Of course I'm aware of it this work probably won't give m a (bit late) YUP existence in SanFrancisco or a well paid Berkeley professorship that I like, but at least I don't really run the risk of looking like a dumb-*ss when playing the unpaid professor a bit in this territory, and

Re: [music-dsp] Analog versus digital systems (Ezra Buchla)

2013-11-10 Thread Theo Verelst
... a) of course we all know about the sampling theorem and sync interpolation. truly! b) though i enjoy reading ASM synth code, i don't see anything here that is interesting. ... I'm sorry to say, but while of course I don't feel all too much of it, and of course that isn't a reason to use my

Re: [music-dsp] Analog versus digital systems (Ezra Buchla)

2013-11-11 Thread Theo Verelst
Sure, and I didn't call you dumb. I'm not dumb for being left out the Russian space program, or wanting to write a book without a alpha-degree or what else.. It's a hard area, which I why I've tried to make a few noticeable remarks, to shake the particular subject up a bit, so to speak. If

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

2013-11-11 Thread Theo Verelst
Urs Heckmann wrote: ... Hehehe, I'm sorry, but this sounds an aweful lot more like a cleric's point of view than a scientist's one ;-) While I agree that zero delay feedback filters have been advertised to death (mea culpa), I don't think it's wise to use that as a proof of their

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

2013-11-12 Thread Theo Verelst
Suppose we take a simple 1st order low-pass (or high-pass) filter in the digital domain, and compare it with the corresponding electronic implementation, preferably as a network theory example, ignoring electro-magnetics, Johnson noise, and physical delay of currents through wires, which are

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

2013-11-12 Thread Theo Verelst
Dave Gamble wrote: On Tue, Nov 12, 2013 at 3:56 PM, Theo Verelsttheo...@theover.org wrote: Suppose . So lets take the equivalent of this simple filter in the digital domain (e.g. as function of a z^-1 network, and see what happens. Well, there's obviously no direct equivalent. It comes

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

2013-11-12 Thread Theo Verelst
Dave Gamble wrote: On Tue, Nov 12, 2013 at 4:48 PM, vadim.zavalishin vadim.zavalis...@native-instruments.de wrote: PS. Speaking of EE, I believe this simple RC filter *does* have feedback, from the capacitor's voltage via the resistor's voltage to the capacitor's charging current. Which is

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

2013-11-12 Thread Theo Verelst
Lubomir I. Ivanov wrote: On 6 November 2013 11:45, Andrew Simper a...@cytomic.com wrote: ... actually trapezoidal is all over quantum mechanics because, say in comparison to midpoint you will get those control and state variable intermediates that mess calculation quite badly in cases that you

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

2013-11-13 Thread Theo Verelst
I must say that where I received my (at the time) top level education, the PhD's had much higher standards concerning human modesty and theoretical respect. Probably that is because at the technical university one is supposed to decent work, and pass, say, the sophomore year (of EE in my case)

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

2013-11-15 Thread Theo Verelst
A few historically relevant contributions to solving network equations, and some related physical/mechanical excercises Keep in mind when simulating linear, time-invariant electrical networks, that it can be proven that the equations coming from the MNA method are the actual differential

Re: [music-dsp] Oversampling and CPU + Bandlimited Distortion Effects?

2013-11-29 Thread Theo Verelst
Jeff Smith wrote: Hi I have a couple of questions... Let's start with the latter: (1) How does a guitar amp distortion effect deal with aliasing. If you use a transfer function like tanh, ... Hi jeff, I quickly looked at the webpage with effects, and must admid I didn't spend the time to

Re: [music-dsp] Oversampling and CPU + Bandlimited Distortion Effects?

2013-11-30 Thread Theo Verelst
A short few notes for those interested. AD converters have self-noise, which in most cases will not even be lower than the equivalent of 16 bits, except for some pro cases and in case there are tricks being used (which influence the bit accuracy). Say you have a 24 bits converter, seldom will

[music-dsp] Frequency bounded DSP

2014-01-02 Thread Theo Verelst
Hi all, A little theoretical experiment, with practical applicability. Everybody has heard of the idea of Aliasing Distortion, right ? So what can we do to prevent it? We want to prevent it because there's a beautiful Sampling+Reconstruction theory, that says we can sample *any* signal that

Re: [music-dsp] Frequency bounded DSP

2014-01-03 Thread Theo Verelst
Well, the questions are good, there's a reason for trying to make a theoretically bandwidth limited wave and envelope, and if possible also modulations, or something that resembles modulations. The AM example is random in itself, but indeed says something about the possibility to modulate a

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