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

2013-11-11 Thread Vadim Zavalishin
On 11-Nov-13 01:09, robert bristow-johnson wrote: On 11/8/13 6:47 PM, Andrew Simper wrote: It depends if you value numerical performance, cutoff accuracy, dc performance etc etc, DF1 scores badly on all these fronts, nope. and this is even in the case where you keep your cutoff and q

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

[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

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

2013-11-11 Thread Urs Heckmann
On 11.11.2013, at 02:21, robert bristow-johnson r...@audioimagination.com wrote: On 11/10/13 5:12 PM, Urs Heckmann wrote: On 11.11.2013, at 01:33, robert bristow-johnsonr...@audioimagination.com wrote: but you cannot define your current output sample in terms of the current output

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

2013-11-11 Thread Vadim Zavalishin
Hi Ross, since you opened this topic, I thought I'd try to share the intermediate results my findings, as much as I can remember them (that was a few years back). Most of them concern the continuous time case. First note regarding the continuous time case is that cutoff modulations do not

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

2013-11-11 Thread Vadim Zavalishin
Hi Marco On 11-Nov-13 11:26, Marco Lo Monaco wrote: I basically demonstrate what I already said in my previous posts. The standard state-space approach leads to identical results to your algorithm, I would say even without the trick of the TPT, because of course we are talking about an

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

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

2013-11-11 Thread Vadim Zavalishin
On 11-Nov-13 13:04, Theo Verelst wrote: Alright, simply put: the paradigm used to work with digital filters is at stake Funnily enough, it's a mathematically trivial fact that in the LTI case the 0df filters are mathematically equivalent to the DF BLT filters. So, the only non-scientific

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

2013-11-11 Thread Ross Bencina
Hi Vadim, Thanks for your feedback... On 11/11/2013 9:52 PM, Vadim Zavalishin wrote: [snip on the analog stuff] For the discrete-time case the situation is more complicated, because we can't use the continuity of the state vector function. IIRC, I also didn't manage to build the worst-case

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

2013-11-11 Thread Vadim Zavalishin
On 11-Nov-13 15:32, Ross Bencina wrote: That's why I was somewhat surprised that you simply managed to restrict the eigenvalues of the system matrix in some coordinates. To be clear: the eigenvalues of the transition matrix only cover time-invariant stability. The constraint for time-varying

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

2013-11-11 Thread Dave Gamble
On Monday, November 11, 2013, Urs Heckmann wrote: On 11.11.2013, at 01:33, robert bristow-johnson r...@audioimagination.com wrote: but you cannot define your current output sample in terms of the current output sample. But that, with all due respect, is what has been done for quite

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

2013-11-11 Thread Dave Gamble
On Monday, November 11, 2013, robert bristow-johnson wrote: So delay-free is a pointless expression to me, it has been used to discuss or advertise delay-free feedback which, to me, still remains an impossibility for discrete-time systems. and i've seen the papers. when it all boils

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

2013-11-11 Thread Vadim Zavalishin
On 11-Nov-13 17:33, Dave Gamble wrote: At some point, the process of using algebraic rearrangements [...] got dubbed the delay-free or zero delay filters movement. Hi Dave I think this is exactly the source of the confusion. As the distinctive feature of those filters were zero-delay feedback

[music-dsp] [admin] HTML test

2013-11-11 Thread douglas repetto
This is an html email. If you're reading the list in a plaintext only client, please let me know if you can't read this message. (JOKE!) best, douglas -- ... http://artbots.org .douglas.irving http://dorkbot.org

[music-dsp] [admin] plain text test

2013-11-11 Thread douglas repetto
I just sent a message to the list using HTML. If you use a plain text only client and could not read it, please let me know. best, douglas -- ... http://artbots.org .douglas.irving http://dorkbot.org

Re: [music-dsp] [admin] HTML test

2013-11-11 Thread Dave Gamble
Hi, On 11 Nov 2013, at 17:09, douglas repetto doug...@music.columbia.edu wrote: This is an html email. If you're reading the list in a plaintext only client, please let me know if you can't read this message. (JOKE!) It might have been an html email originally, but what arrived here is

Re: [music-dsp] Your message to music-dsp awaits moderator approval

2013-11-11 Thread STEFFAN DIEDRICHSEN
I think, I stretched it … Steffan On 11.11.2013, at 18:15, music-dsp-boun...@music.columbia.edu wrote: Your mail to 'music-dsp' with the subject Fun with HTML Is being held until the list moderator can review it for approval. The reason it is being held: Message body is too

[music-dsp] [admin] another HTML test

2013-11-11 Thread douglas repetto
Hi Dave, I have the list set to convert HTML mail to plain text. So it's a good sign that the email went through. I'm composing this in red text and changing fonts around. That should all disappear when this message arrives... Here's a list: 1. * taco 2. * truck Wheee! --

Re: [music-dsp] Your message to music-dsp awaits moderator approval

2013-11-11 Thread douglas repetto
Okay, that's just because the message was too large. Note that the HTML is actually being stripped out, so crazy formatting will be removed. On 11/11/13 12:16 PM, STEFFAN DIEDRICHSEN wrote: I think, I stretched it … Steffan On 11.11.2013, at 18:15, music-dsp-boun...@music.columbia.edu

Re: [music-dsp] [admin] another HTML test

2013-11-11 Thread douglas repetto
Okay, it seems to be working. You can now post to the list in HTML but your message will be converted to plain text. This seems like a good first step to accommodate people who need plain text and people for whom sending plain text is a pain. I tried to respond to some message from my phone

Re: [music-dsp] [admin] another HTML test

2013-11-11 Thread douglas repetto
Oh, and I've turned on notification for bounced messages. Hopefully we won't clog up the server too much. In the past we've had thousands of robots hammering on the server 24/7. best, douglas On 11/11/13 12:16 PM, douglas repetto wrote: Hi Dave, I have the list set to convert HTML

Re: [music-dsp] [admin] another HTML test

2013-11-11 Thread Thomas Young
Thanks Doug :) -Original Message- From: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] On Behalf Of douglas repetto Sent: 11 November 2013 17:19 To: A discussion list for music-related DSP Subject: Re: [music-dsp] [admin] another HTML test Okay,

Re: [music-dsp] [admin] another HTML test

2013-11-11 Thread Dave Gamble
Indeed, it appears to be +completely+ impossible to send non-multipart plaintext email from iOS using the Mail app there, or even the gmail app. Dave. On Mon, Nov 11, 2013 at 5:19 PM, douglas repetto doug...@music.columbia.edu wrote: Okay, it seems to be working. You can now post to the

Re: [music-dsp] [admin] another HTML test

2013-11-11 Thread Reid Oda
Yes thank you! ...and all this time I thought my questions were simply uninteresting. On Mon, Nov 11, 2013 at 12:20 PM, Thomas Young thomas.yo...@rebellion.co.uk wrote: Thanks Doug :) -Original Message- From: music-dsp-boun...@music.columbia.edu

Re: [music-dsp] [admin] another HTML test

2013-11-11 Thread douglas repetto
Same with the stock Android mail client. On 11/11/13 12:20 PM, Dave Gamble wrote: Indeed, it appears to be +completely+ impossible to send non-multipart plaintext email from iOS using the Mail app there, or even the gmail app. Dave. On Mon, Nov 11, 2013 at 5:19 PM, douglas repetto

[music-dsp] Fwd: [admin] another HTML test

2013-11-11 Thread STEFFAN DIEDRICHSEN
Begin forwarded message: From: STEFFAN DIEDRICHSEN sdiedrich...@mac.com Subject: Re: [music-dsp] [admin] another HTML test Date: 11. November 2013 18:20:14 MEZ To: A discussion list for music-related DSP music-dsp@music.columbia.edu Does this apply to rich text mails as well? That was

Re: [music-dsp] Fwd: [admin] another HTML test

2013-11-11 Thread douglas repetto
Yes, it should convert rich text to plain text. Can you send a test message? At the least it should send you back a bounce message. best, douglas On 11/11/13 12:22 PM, STEFFAN DIEDRICHSEN wrote: Begin forwarded message: From: STEFFAN DIEDRICHSEN sdiedrich...@mac.com Subject: Re:

Re: [music-dsp] Fwd: [admin] another HTML test

2013-11-11 Thread STEFFAN DIEDRICHSEN
Rich t textTest. . Should be red. If not, all is well. Steffan On 11.11.2013, at 18:23, douglas repetto doug...@music.columbia.edu wrote: Yes, it should convert rich text to plain text. Can you send a test message? At the least it should send you back a bounce message. best, douglas

[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] Tenure-Track Audio/Multimedia Engineer position at UVA

2013-11-11 Thread Ryan Maguire
Hey Music-DSP folks, The University of Virginia McIntire Department of Music is still accepting applications for a tenure-track Audio/Multimedia Engineer. See below for more information. - Ryan - The University of Virginia McIntire Department of Music invites applications for a

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

2013-11-11 Thread Andrew Simper
On 11 November 2013 08:09, robert bristow-johnson r...@audioimagination.com wrote: On 11/8/13 6:47 PM, Andrew Simper wrote: On 9 November 2013 08:57, Tom Duffytdu...@tascam.com wrote: Having worked with Direct-Form I filters for half of my career, I've been glossing over this discussion as

Re: [music-dsp] Fwd: [admin] another HTML test

2013-11-11 Thread Andrew Simper
(sent in html) Thanks Douglas! This is a huge help. All the best, Andy -- cytomic - sound music software On 12 November 2013 01:26, STEFFAN DIEDRICHSEN sdiedrich...@me.com wrote: Rich t textTest. . Should be red. If not, all is well. Steffan On 11.11.2013, at 18:23, douglas repetto

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

2013-11-11 Thread Nigel Redmon
Andy makes a good point—DF1 is indeed pretty poor, extremely sensitive to quantization error at the low end. With 24-bit fixed point, 56-bit accumulation of the moto/freescale family, which I know Robert is extremely familiar with, and a natural for implementing DF1, it's still not good enough