Re: [music-dsp] who else needs a fractional delay.

2010-11-19 Thread Nigel Redmon
Synchronization (between equipment not locked to a master clock). On Nov 19, 2010, at 1:07 PM, robert bristow-johnson wrote: i can't think of another effect, offhand, that would definitely need a fractional delay filter in it, but i am sure they exist. -- dupswapdrop -- the music-dsp

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

2010-11-20 Thread Nigel Redmon
On Nov 20, 2010, at 4:28 AM, Theo Verelst wrote: You don't want to acknowledge that and play a non manly turn-behindish childish attitude to me, than either you are very low under a university educated Electrical Engineer, or maybe part of a secret club, I don't know, but I don't buy into

Re: [music-dsp] [OT] vinyl? No, thanks...

2010-11-28 Thread Nigel Redmon
Not sure if Art of Noise is the best choice for that comparison, since all their stuff was done on the Fairlight CMI, afaik. On Nov 28, 2010, at 8:56 AM, Rainer Buchty wrote: On Mon, 22 Nov 2010, Stephen Sinclair wrote: (Vinyl just sounds.. different.. better.. but I couldn't tell you

Re: [music-dsp] [OT] vinyl? No, thanks...

2010-11-28 Thread Nigel Redmon
machines can simulate this to __really__ give the sound of vinyl, or is the difference rooted in the very nature of analogue vs digital reproduction? Andy On Sun, 28 Nov 2010 12:15:24 -0800 Nigel Redmon earle...@earlevel.com wrote: We'd expect a 16-bit digital recording (CD) of music

Re: [music-dsp] [OT] vinyl? No, thanks...

2010-11-28 Thread Nigel Redmon
? c On Sun, 28 Nov 2010 14:33:40 -0800, Nigel Redmon wrote: First, realize that my point about the Art of Noise as a reference was also that it wasn't a particularly good source to show off CD's virtues either (using hi-fi digital to record low-fi digital) -- dupswapdrop -- the music-dsp

Re: [music-dsp] Waveform Interpolation

2010-12-12 Thread Nigel Redmon
working fine now. On Dec 11, 2010, at 9:38 PM, robert bristow-johnson wrote: On Dec 11, 2010, at 7:32 PM, Nigel Redmon wrote: OK, fixed the Firefox/Opera issue. Lesson learned: javascript returns -Infinity for log(0), not NaN, which I was checking for. Some javascript implementations don't

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

2010-12-21 Thread Nigel Redmon
Hi Andy, Actually, aliasing shouldn't be created by the downsampling. (well, now a little paranoia that I just got out of bed and I'm going to say something dumb--lol) OK, downsampling is often considered just the portion of the rate reduction that discards samples, so of course that is

Re: [music-dsp] Bandlimiting, Aliasing and Reconstructed Signals

2010-12-23 Thread Nigel Redmon
Hi Charles, although I'm greatly challenged by the math most of the time Please read some of my articles, starting here--I try to steer clear of math as much as possible: http://www.earlevel.com/main/2007/07/03/sampling-in-depth That and the post that follows it are a pair, so please read

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

2010-12-23 Thread Nigel Redmon
, whatever) by the new Nyquist frequency (22050 Hz). But you will not have a zero every other sample, and you can not just copy the original samples. Make sense? On Dec 23, 2010, at 10:18 AM, robert bristow-johnson wrote: On Dec 23, 2010, at 12:46 PM, Nigel Redmon wrote: On Dec 21, 2010, at 8:36

Re: [music-dsp] Bandlimiting, Aliasing and Reconstructed Signals

2010-12-23 Thread Nigel Redmon
it, because I'm using it for offline, but it should be as fast or faster (probably faster) than FFTW, and builds the required goods at compile time instead of during runtime initialization, unlike FFTW. On Dec 23, 2010, at 12:51 PM, Charles Turner wrote: On Dec 23, 2010, at 11:31 AM, Nigel Redmon

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

2010-12-28 Thread Nigel Redmon
-johnson wrote: well, okay, one more round... On Dec 28, 2010, at 12:59 PM, Nigel Redmon wrote: On Dec 21, 2010, at 11:22 AM, Nigel Redmon wrote: As for things like distortion modeling of guitars, I can tell you that windowed sinc is involved, at least on the upsampling leg where you likely

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

2010-12-28 Thread Nigel Redmon
or was it someone else? (this is my excuse for responding when i said you could have the last word.) i sayed: was is not the same as is. On Dec 28, 2010, at 6:54 PM, Nigel Redmon wrote: It was designed in. It is in products that I could go buy at guitar center today. Anyway, moot point

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

2010-12-29 Thread Nigel Redmon
i think we skeered 'em, Robert ;-) On Dec 29, 2010, at 4:41 PM, Theo Verelst wrote: .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:

Re: [music-dsp] resonance

2011-01-03 Thread Nigel Redmon
OK, for the biquad, consider that you'll have to recalculate all of the coefficients as the LFO value changes the Fc (or Q). And because you have so many coefficients, it's difficult to avoid calculations (and those divisions are a lot more expensive than multiplies, btw) nd do table lookups,

Re: [music-dsp] Approaches to multiple band EQ

2011-01-11 Thread Nigel Redmon
In addition to what Robert says about the lack of generality in the numerator of the Chamberlin SVF (it's an all pole filter), you can't set the Fc very high in the audio band. It's not a good choice for this application. On Jan 11, 2011, at 4:32 PM, robert bristow-johnson wrote: On Jan

Re: [music-dsp] New patent application on uniformly partitioned convolution

2011-01-28 Thread Nigel Redmon
I've been on a number of patent cases (as software expert, sometimes electronics), big players, on both sides... First, patents are important, and help progress. Non-obvious advances often come from expensive and lengthy research. Imagine a situation where company A invests in research, and

Re: [music-dsp] New patent application on uniformly partitioned convolution

2011-01-29 Thread Nigel Redmon
. Anyway, this is just another rant. Nothing is likely to change. Al Clark Danville Signal On 1/28/2011 3:47 PM, Nigel Redmon wrote: I've been on a number of patent cases (as software expert, sometimes electronics), big players, on both sides... First, patents are important, and help

Re: [music-dsp] New patent application on uniformly partitioned convolution

2011-01-29 Thread Nigel Redmon
parties? a. On Sat, 29 Jan 2011 13:36:13 -0800 Nigel Redmon earle...@earlevel.com wrote: Now, on the less important-to-society front: A company comes up with an idea for tactile feedback in video games. This sort of thing is immediately obvious once demonstrated, so trade secrets

Re: [music-dsp] damn patents (was New patent application on uniformly partitioned convolution) [OT]

2011-02-07 Thread Nigel Redmon
Off the top of my head (no guarantee I'm recalling correctly--I'll leave it to others to fill in details ;-) : NED licensed Yamaha's patents for the Synclavier. Casio used a slightly different technique (phase distortion synthesis). Yamaha did sue Casio--I think maybe Yamaha eventually won or

Re: [music-dsp] Noise performance of f32 iir filters

2011-10-02 Thread Nigel Redmon
TPT... uh, topology-preserving transform I think... BLT bi-linear transform... Recently, I went into a bit of a different (still computer technology related field, just more enterprise-level), and was immediately buried in TLA (three-letter acronyms--substitute abbreviations if you insist that

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

2012-01-09 Thread Nigel Redmon
Hi Robert, Care to narrow down the target (I suppose there are multiple, but maybe start with the one or two of most immediate concern)? I looked at it a bit, and it's a lot to juggle, looking at diffs and the back and forth. Maybe it's just getting late, and I played a lot of basketball

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

2012-01-10 Thread Nigel Redmon
I've long treated wikipedia as a useful tool that I reference often, and trust about as far as I can throw the internet. That is, it's good for getting a quick look at many things, as long as you understand that anything that has the slightest chance of involving a point of view will be bias,

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

2012-01-10 Thread Nigel Redmon
Ah, that (the RMI using Walsh functions) sounds familiar...I remember Bernie Hutchins (Electronotes) did some articles back in the 70's on Walsh functions...it also reminds me of having fun back in the 70's when I figured out I could run my analog sequencers at audio rates and get some cool

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

2012-01-11 Thread Nigel Redmon
Molesworth wrote: On 11/01/12 06:45, Nigel Redmon wrote: Just to get my fingertips wet again, I fixed something trivial that I had commented on over two years ago: One of the simplest things you could imagine, an article on the while loop construct in programming. There were examples in many

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

2012-01-16 Thread Nigel Redmon
if they are needed, like in front of names (of synthesizers) here. But I'm going to claim that most of that text looked even worse before. :-) -olli On Mon, Jan 16, 2012 at 6:16 PM, robert bristow-johnson r...@audioimagination.com wrote: On 1/16/12 1:16 AM, Nigel Redmon wrote: Nice

Re: [music-dsp] Signal processing and dbFS

2012-01-17 Thread Nigel Redmon
My understanding is that different manufactureres have different voltage levels that are assigned as 0dB. Not exactly—it's worse than that ;-) dB is a ratio, of course, and there are a couple of popular reference standards. People sometimes talk about a device being +4 (dB) or -10 (dB). The

Re: [music-dsp] Signal processing and dbFS

2012-01-18 Thread Nigel Redmon
If we're overthinking it, it's probably because we're not sure what Linda's after. I'm sure she knows the formula for voltage conversion to dB. On Jan 18, 2012, at 2:34 AM, Thomas Young wrote: Most people seem to be overthinking this, Uli has posted the important equation here: Y [dBFS] =

Re: [music-dsp] music-dsp Digest, Vol 97, Issue 21

2012-01-18 Thread Nigel Redmon
Hi Linda, Ross nailed it on his comments in general (the most basic of which is out of the ones you mention, dBFS is the only one that has any meaning in the digital domain), I'm left with a couple of comments: To your first question, it would be easier if you pointed to particular graphs and

Re: [music-dsp] choice of Q for graphic equalizers

2012-02-06 Thread Nigel Redmon
Shashank: Analog filters—the kind in analog mixing consoles that mixed most of what you grew up on—are IIR. So are most of their digital counterparts. So, that's what people are used to. Of course Ross is right about transients, depending on the amount of filtering used, but linear phase has

Re: [music-dsp] a little about myself

2012-02-19 Thread Nigel Redmon
Welcome Adam. On Feb 18, 2012, at 6:55 PM, Adam Puckett wrote: Hey list, My name is Adam Puckett. I am a totally blind C programmer with an associates degree in IT and an interest in DSP. I use a program called Csound to create music, and I also play many instruments: guitar, piano

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

2012-02-22 Thread Nigel Redmon
Apparently, the wave is made from shapes that are roughly those of the letters (and their colors) in the Google logo...annoying to us, but there is some logic behind it... On Feb 22, 2012, at 6:20 AM, douglas repetto wrote: This is driving me nutz: http://www.google.com And now an

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

2012-02-23 Thread Nigel Redmon
If the sample rate is much higher than the resolution of the image, no problem making that vertical-looking section in the real world ;-) On Feb 22, 2012, at 4:08 PM, Phil Burk wrote: On 2/22/12 2:25 PM, douglas repetto wrote: I was making a bit of a joke -- no time domain signal can have

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

2012-02-23 Thread Nigel Redmon
Eh, I still say they weren't going for a sine wave at all. Look at their other doodles. I'm sure that their designers would have felt that a sine wave would have missed the point for them. http://www.zazzle.com/robert_schumanns_200th_birthday_tshirt-235517387819488097 On Feb 23, 2012, at 3:27

Re: [music-dsp] list postings

2012-02-25 Thread Nigel Redmon
I've had problems in the past when html-style font tags make their way into the email. For instance, this happens in Apple's Mail.app. Even though it's not an html email, per se, they sometimes get rejected (but not always). If I do Make Plain Text from the Format menu before sedning, then they

Re: [music-dsp] list postings

2012-02-25 Thread Nigel Redmon
/colors/styles can be unpleasant. douglas On 2/25/12 2:02 PM, Nigel Redmon wrote: I've had problems in the past when html-style font tags make their way into the email. For instance, this happens in Apple's Mail.app. Even though it's not an html email, per se, they sometimes get rejected

Re: [music-dsp] list postings

2012-02-25 Thread Nigel Redmon
such big concerns anymore, I think. Although I personally find that reading a list like this in different fonts/colors/styles can be unpleasant. douglas On 2/25/12 2:02 PM, Nigel Redmon wrote: I've had problems in the past when html-style font tags make their way into the email

Re: [music-dsp] maintaining musicdsp.org

2012-04-04 Thread Nigel Redmon
I was about to add the same. Mine isn't a real high-traffic blog, but it definitely made my life a lot easier after I added CAPTCHA... On Apr 4, 2012, at 11:36 AM, david.lowenf...@gmail.com wrote: hmm... what about a CAPTCHA? -D -- dupswapdrop -- the music-dsp mailing list and website:

Re: [music-dsp] maintaining musicdsp.org

2012-04-04 Thread Nigel Redmon
I hope it's obvious that I mean a website (preferably updated with a modern CMS that makes it easy)...the email list is a different story... On Apr 4, 2012, at 3:30 PM, Nigel Redmon wrote: I was about to add the same. Mine isn't a real high-traffic blog, but it definitely made my life a lot

Re: [music-dsp] OSC problem on STM32F4Discovery

2012-04-09 Thread Nigel Redmon
Interesting...my STM32F4DISCOVERY just arrive Friday...intending to make a wavetable oscillator on it, fist thing... Are you writing the wavetable to a buffer, then pulling from that at the sample rate? if so, what size? On Apr 9, 2012, at 6:28 AM, Julian Schmidt wrote: Hello all, I'm

Re: [music-dsp] OSC problem on STM32F4Discovery

2012-04-09 Thread Nigel Redmon
floating-point phase accumulator. and with linear interpolation. it's pretty straight forward. -- r b-j r...@audioimagination.com Imagination is more important than knowledge. On 4/9/12 12:51 PM, Nigel Redmon wrote: Interesting...my STM32F4DISCOVERY just

Re: [music-dsp] OSC problem on STM32F4Discovery

2012-04-10 Thread Nigel Redmon
Not alone, Emanuel. Clicks, especially 2-3 seconds apart doesn't describe aliasing—and looking at the spectral distortion seems to be a separate issue. Julian, does that still describe the problem you're hearing, after your recent code changes? On Apr 10, 2012, at 6:40 AM, Emanuel Landeholm

Re: [music-dsp] OSC problem on STM32F4Discovery

2012-04-10 Thread Nigel Redmon
Interesting Olli—though I don't hear that as clicks—maybe they match the OP's interpretation, but not the impression I got when he said there were clicks... On Apr 10, 2012, at 10:06 AM, Olli Niemitalo wrote: On Tue, Apr 10, 2012 at 6:54 PM, Nigel Redmon earle...@earlevel.com wrote: Clicks

Re: [music-dsp] OSC problem on STM32F4Discover

2012-04-10 Thread Nigel Redmon
AM, Nigel Redmon wrote: Not alone, Emanuel. Clicks, especially 2-3 seconds apart doesn't describe aliasing—and looking at the spectral distortion seems to be a separate issue. Julian, does that still describe the problem you're hearing, after your recent code changes? On Apr 10, 2012

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

2012-05-03 Thread Nigel Redmon
A couple of ideas... First, note that Given identical qualification can imply that someone without a degree might have gotten to the same level as someone with a degree by a lot of digging and figuring on their own. Some call this getting one's hands dirty—implying that you didn't just read

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

2012-05-03 Thread Nigel Redmon
is teachers, nor formal education, but for some reason teachers are most commonly found and most easily located in schools. Regards, Mike On Thu, May 3, 2012 at 5:58 PM, Nigel Redmon earle...@earlevel.com wrote: A couple of ideas... First, note that Given identical qualification can

[music-dsp] Moogle

2012-05-22 Thread Nigel Redmon
The last Google Doodle (the non-sine) made so much noise here, I'm anxious to read what people have to say about the Moog tribute. I had done a search form Safari's search field, so I wasn't met with the full (sort of) Mini, but just an icon in the upper left of the search window. I'm

Re: [music-dsp] Moogle

2012-05-23 Thread Nigel Redmon
://www.html5audio.org/2012/05/googles-moog-doodle-falls-back-to-flash.html I find it very frustrating trying to get audio working on the web now that I can't count on flash or java support on all screens. bjorn On May 23, 2012, at 1:49 AM, Nigel Redmon wrote: The last Google Doodle (the non

Re: [music-dsp] Moogle

2012-05-23 Thread Nigel Redmon
Not sure why this didn't post, trying again... http://www.moogmusic.com/content/google-doodle-how On May 23, 2012, at 8:58 AM, Adam Puckett wrote: To me this is just a small accessibility hurdle I will have to jump over until tomorrow. I can't figure out how to work it. -- dupswapdrop -- the

Re: [music-dsp] ANN: Book: The Art of VA Filter Design

2012-05-25 Thread Nigel Redmon
Thanks Vadim! (I saw a reference to Vadim's book in a kvr thread yesterday, was going to track down what he was referring too...) On May 25, 2012, at 1:54 AM, Vadim Zavalishin wrote: Hi all This is kind of a cross-announcement from KVRAudio, but since there are probably a number of

Re: [music-dsp] i need a knee

2012-08-10 Thread Nigel Redmon
Robert gave an excellent reply, hitting all of the thoughts I had...except: they wanted me to build bombs and instead i am coding musical instruments, you should respect that... I think that you might have run into similar problems building bombs... ;-) On Aug 10, 2012, at 3:23 AM, Bastian

Re: [music-dsp] ARM for DSP

2012-09-25 Thread Nigel Redmon
I haven't had time to do much with it yet, but the STM32F4DISCOVERY board is bargain, with single precision floating point and DSP features (single cycle MAC, saturated arithmetic, SIMD), and a bunch of nice goodies on the baord, $14.55 at Mouser. On Sep 24, 2012, at 5:54 PM, Chris Townsend

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-03 Thread Nigel Redmon
The zeros are at DC and Nyquist because the numerator is s…Basically, you need to adjust the zeros based on the pole positions (both angle and Q) and the desired stop band spec. I'm not 100% sure what Thomas is after, but I suspect it's just an inversion of band reject (swap the poles and

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-03 Thread Nigel Redmon
Thomas—it's a matter of manipulating the A and Q relationships in the numerator and denominator of the peaking EQ analog prototypes. I'm not as good in thinking in the s domain as the z, so I'd have to plot it out and think—too busy right now, though it's pretty trivial. But just doing the gain

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-03 Thread Nigel Redmon
Message- From: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] On Behalf Of Nigel Redmon Sent: 03 January 2013 18:48 To: A discussion list for music-related DSP Subject: Re: [music-dsp] Lerping Biquad coefficients to a flat response Thomas-it's a matter

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-03 Thread Nigel Redmon
Well, you're already working with rbj's equations, so just multiple the numerator coefficients by A^2... On Jan 3, 2013, at 1:05 PM, Nigel Redmon earle...@earlevel.com wrote: OK, I had (well, took) time to think: You need to divide the numerator by the gain (A), and multiple

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-03 Thread Nigel Redmon
on top) On Jan 3, 2013, at 1:20 PM, Nigel Redmon earle...@earlevel.com wrote: Well, you're already working with rbj's equations, so just multiple the numerator coefficients by A^2... On Jan 3, 2013, at 1:05 PM, Nigel Redmon earle...@earlevel.com wrote: OK, I had (well, took) time

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-03 Thread Nigel Redmon
sigh…hopefully my last post on this… Sorry, I looked at rbi's peak spec and it is symmetrical—I was thinking of his shelving filters, which need to be inverted for symmetry. So just multiply the denominator coefficients by A^2 and you're done. On Jan 3, 2013, at 2:02 PM, Nigel Redmon earle

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-04 Thread Nigel Redmon
On 4/01/2013 4:34 AM, Thomas Young wrote: However I was hoping to avoid scaling the output since if I have to do that then I might as well just change the wet/dry mix with the original signal for essentially the same effect and less messing about. I read quickly this morning and missed

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-04 Thread Nigel Redmon
, worked till 2:45 AM, spammed the board in between... On Jan 4, 2013, at 7:53 AM, douglas repetto doug...@music.columbia.edu wrote: This is cracking me up, keep going! We want more!!! Soon you'll have a one hour DSP comedy special! On 1/3/13 5:22 PM, Nigel Redmon wrote: sigh…hopefully my

Re: [music-dsp] Lerping Biquad coefficients to a flat response

2013-01-04 Thread Nigel Redmon
to when you suggest multiplying denominator coefficients by the gain factor, the peaking one? -Original Message- From: music-dsp-boun...@music.columbia.edu [mailto:music-dsp-boun...@music.columbia.edu] On Behalf Of Nigel Redmon Sent: 04 January 2013 09:26 To: A discussion list for music

Re: [music-dsp] Programming ARC on a compressor

2013-01-10 Thread Nigel Redmon
Hi James—I did a very quick scan of what was still in my email locally, and this might be what you were thinking of: http://music.columbia.edu/pipermail/music-dsp/2011-June/069965.html On Jan 10, 2013, at 4:16 PM, James C Chandler Jr jchan...@bellsouth.net wrote: On Jan 10, 2013, at 7:10

Re: [music-dsp] Starting From The Ground Up

2013-01-21 Thread Nigel Redmon
Hi Jeffrey, In addition to to the many good suggestions you've received, may I suggest my website? (Self promotion, though I don't get anything out of it other than practice thinking.) I have several new articles about ready to publish when I get a moment. http://earleve.com Nigel On Jan

Re: [music-dsp] Starting From The Ground Up

2013-01-21 Thread Nigel Redmon
ugh, pardon the typo: http://earlevel.com On Jan 21, 2013, at 10:23 AM, Nigel Redmon earle...@earlevel.com wrote: Hi Jeffrey, In addition to to the many good suggestions you've received, may I suggest my website? (Self promotion, though I don't get anything out of it other than

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

2013-03-09 Thread Nigel Redmon
On Mar 8, 2013, at 2:53 PM, ChordWizard Software corpor...@chordwizard.com wrote: But some are quite new - I never realised that multiplication ops were more efficient than divisions. Worthy of some background... When multiplying, you can do all the necessary multiplications in parallel

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

2013-03-11 Thread Nigel Redmon
On Mar 9, 2013, at 9:23 PM, robert bristow-johnson r...@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] Trapezoidal integrated optimised SVF v2

2013-11-07 Thread Nigel Redmon
I too appreciate Andrew's input. I'm sure that most here do as well. On Nov 7, 2013, at 9:11 AM, STEFFAN DIEDRICHSEN sdiedrich...@me.com wrote: I think, that’s not fair. Andrew has created some great products, just look at his website http://www.cytomic.com. To me, it’s an really interesting

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

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

2013-11-12 Thread Nigel Redmon
12, 2013, at 12:26 AM, Ross Bencina rossb-li...@audiomulch.com wrote: On 12/11/2013 5:47 PM, Nigel Redmon wrote: For anyone interested, here's the block diagram: http://www.earlevel.com/DigitalAudio/images/BiquadDFIN.gif (from this article: http://www.earlevel.com/main/2003/02/28/biquads/ ). Q

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

2013-11-12 Thread Nigel Redmon
added or subtracted the result as needed. Their math subroutines weren't general, but they did exactly what was needed.) On Nov 12, 2013, at 1:33 AM, Ross Bencina rossb-li...@audiomulch.com wrote: On 12/11/2013 8:07 PM, Nigel Redmon wrote: The exact answer depends on the exact hardware. It's

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

2013-11-14 Thread Nigel Redmon
PM, Nigel Redmon wrote: The problem is that the error is lost in the floating point hardware—you put in two floats and get back float of the same size. Something fell into a bit bucket that you don't have access to. I figured that there must be some way to recover the error. After some

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

2013-11-28 Thread Nigel Redmon
1) Sure, oversampling. You need frequency headroom. 2) There isn't a specific minimum requirement, so this isn't really an issue. That is, the more cpu you have, the more and better you can oversample, but you do what you need and what you can get away with. (You could go nuts and think that,

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

2013-11-28 Thread Nigel Redmon
away with 6x, but that's less of an issue now than it was 20 years ago when every cycle mattered. In multiple steps. On Nov 28, 2013, at 10:41 AM, Thomas Strathmann tho...@pdp7.org wrote: On 28.11.13 19:30, Nigel Redmon wrote: 2) There isn't a specific minimum requirement, so this isn't really

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

2013-11-28 Thread Nigel Redmon
crank the distortion, so does your ability to hear the aliasing. ;-) On Nov 28, 2013, at 11:38 PM, robert bristow-johnson r...@audioimagination.com wrote: On 11/28/13 1:16 PM, Nigel Redmon wrote: It's really a pretty easy call in the end—one made by ear. Basically, you see how noticeable

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

2013-11-29 Thread Nigel Redmon
based on integrals of (1-x^2)^N or (1-x^N)^2, you have concatinated functions, which leads to very high order polynomials. Then you need to apply common-sense, like the one mentioned below. Steffan On 29 Nov 2013, at 08:48, Nigel Redmon earle...@earlevel.com wrote: Robert…If you're

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

2013-11-29 Thread Nigel Redmon
to the rim. very sore muscles today.) L8r, r b-j On 11/29/13 10:25 AM, Nigel Redmon wrote: Hi Stephan, I don't disagree with Robert's formula at all. I'm simply saying it doesn't apply. In a real implementation, you clip the signal as soon as you get outside of the portion

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

2013-11-30 Thread Nigel Redmon
On Nov 30, 2013, at 11:28 AM, robert bristow-johnson r...@audioimagination.com wrote: On 11/29/13 11:54 AM, Nigel Redmon wrote: Not to Robert so much, but for anyone who hasn't thought too deeply about guitar amps, maybe it's helpful to look at what you're up against. It's the extremely

Re: [music-dsp] Moselle Alpha 0.1.3 Released

2014-01-13 Thread Nigel Redmon
According to the wisdom of XKCD, Functional programming combines the flexibility and power of abstract mathematics with the intuitive clarity of abstract mathematics. ;-) On Jan 13, 2014, at 3:51 PM, Risto Holopainen rist...@hotmail.com wrote:

Re: [music-dsp] still empty .wav stereo generated, please help

2014-01-24 Thread Nigel Redmon
for(i=0, i BUFFRAMES; i++;) Hi Pablo, I don't have time to look at the whole thing at the moment. I know that you're a beginner, but the FIRST thing you need to do is carefully proof read each line of code and ask yourself if it's right. For instance, look at your FOR loop. above. It

Re: [music-dsp] can someone precisely define for me what is meant by proportional Q?

2014-02-11 Thread Nigel Redmon
Hi Robert, The Digital Performer manual mentions it for type III EQ in their MW EQ plug-in, mentioning a few: 'More specifically, this style emulates the classic Neve EQs, their modern derivatives and later SSL G series EQs. Many current popular outboard “boutique” EQs exhibit this same

Re: [music-dsp] can someone precisely define for me what is meant by proportional Q?

2014-02-12 Thread Nigel Redmon
, robert bristow-johnson r...@audioimagination.com wrote: On 2/11/14 2:15 PM, Nigel Redmon wrote: Hi Robert, The Digital Performer manual mentions it for type III EQ in their MW EQ plug-in, mentioning a few: 'More specifically, this style emulates the classic Neve EQs, their modern

Re: [music-dsp] can someone precisely define for me what is meant by proportional Q?

2014-02-12 Thread Nigel Redmon
applied to the BPF that is in parallel and added to the wire. now let's be clear about what you're saying: On 2/11/14 2:15 PM, Nigel Redmon wrote: In a quick check, at maximum gain, +20 dB, type III gives the same response as plain liquids (that is, no gain-Q interaction). how do you know

Re: [music-dsp] can someone precisely define for me what is meant by proportional Q?

2014-02-15 Thread Nigel Redmon
BTW, just to be sure that you (or anyone reading) realize, Robert's A is not the same as in your Zolzer equations (Zolzer uses V). Robert's A is sqrt(V), where V (or the A in the Zolzer equation below) is 10^(dBgain/20). On Feb 13, 2014, at 2:38 AM, Dave Gamble davegam...@gmail.com wrote:

Re: [music-dsp] DACs for Dummies (was: can someone precisely define for me what is meant by proportional Q?)

2014-02-17 Thread Nigel Redmon
On Feb 17, 2014, at 9:36 AM, Nigel Redmon earle...@earlevel.com wrote: On Feb 17, 2014, at 6:36 AM, Theo Verelst theo...@theover.org wrote: In short, I can play/enhance in thhe 192/24 domain,, and then switch over to 44.1/16, and hear the difference easily, any day of the week. End

Re: [music-dsp] DACs for Dummies (was: can someone precisely define for me what is meant by proportional Q?)

2014-02-17 Thread Nigel Redmon
On Feb 17, 2014, at 6:36 AM, Theo Verelst theo...@theover.org wrote: The frequency measurement graph being used throughout the rest of the demonstration wasn't specified as being of a specific kind, I mean usually these programs use FFTs which is quite not the same in several cases,

Re: [music-dsp] DACs for Dummies (was: can someone precisely define for me what is meant by proportional Q?)

2014-02-17 Thread Nigel Redmon
, Nigel Redmon wrote: On Feb 17, 2014, at 9:36 AM, Nigel Redmonearle...@earlevel.com wrote: On Feb 17, 2014, at 6:36 AM, Theo Verelsttheo...@theover.org wrote: In short, I can play/enhance in thhe 192/24 domain,, and then switch over to 44.1/16, and hear the difference easily, any day

[music-dsp] Dither video and articles

2014-03-26 Thread Nigel Redmon
Since it’s been quiet… Maybe this would be interesting to some list members? A basic and intuitive explanation of audio dither: https://www.youtube.com/watch?v=zWpWIQw7HWU The video will be followed by a second part, in the coming weeks, that covers details like when, and when not to use

Re: [music-dsp] Nyquist–Shannon sampling theorem

2014-03-26 Thread Nigel Redmon
Is the test signal, while possibly containing any number of wave compenents at various frequencies, required to be continous ansd uniform? By this I mean you can't have frequencies jumping in and out, changing in amplitude etc… The only requirement is that it’s properly band limited, as

Re: [music-dsp] Nyquist–Shannon sampling theorem

2014-03-26 Thread Nigel Redmon
Hi Doug, I think you’re overthinking this… There is the frequency-sensitive requirement that you can’t properly sample a signal that has frequencies higher than half the sample rate. For music, that’s not a problem, since our ears have a significant band limitation anyway. So, if we have a

Re: [music-dsp] Nyquist–Shannon sampling theorem

2014-03-26 Thread Nigel Redmon
It's my understanding that the fourier theory says any signal can be created by summing various frequencies at various phases and amplitudes. OK, now recall that the Fourier series describes a subset of “any signal” with a subset of “various frequencies”. It’s more like one cycle of any

Re: [music-dsp] Nyquist–Shannon sampling theorem

2014-03-26 Thread Nigel Redmon
On Mar 26, 2014, at 10:07 PM, Doug Houghton doug_hough...@sympatico.ca wrote: so is there a requirement for the signal to be periodic? or can any series of numbers be cnsidered periodic if it is bandlimited, or infinit? Periodic is the best word I can come up with. -- Well, no—you can

Re: [music-dsp] Dither video and articles

2014-03-27 Thread Nigel Redmon
:53 PM, Sampo Syreeni de...@iki.fi wrote: On 2014-03-26, Nigel Redmon wrote: Maybe this would be interesting to some list members? A basic and intuitive explanation of audio dither: https://www.youtube.com/watch?v=zWpWIQw7HWU Since it's been quiet and dither was mentioned... Is anybody

Re: [music-dsp] Nyquist–Shannon sampling theorem

2014-03-27 Thread Nigel Redmon
On Mar 26, 2014, at 8:42 PM, Doug Houghton doug_hough...@sympatico.ca wrote: I'm guessing this somehow scratches at the surface of what I've read about no signal being properly band limited unless it's infinit. Sure, in the same sense, we don’t properly sample to digital or properly convert

Re: [music-dsp] R: Dither video and articles

2014-03-29 Thread Nigel Redmon
20 * log10(2^num_bits) So, 32 bits is 192.7 dB. 32-bit floating point has 23 bits for mantissa, plus a hidden bit from normalization, plus a sign bit, for 25 bits of precision, so that works out to 150.5 dB. On Mar 29, 2014, at 1:06 AM, Marco Lo Monaco marco.lomon...@teletu.it wrote: Hey

Re: [music-dsp] R: Dither video and articles

2014-03-29 Thread Nigel Redmon
on every operation. Of course if you’ve got double precision floats, which are just about free for native (host based) DSP), life is pretty easy... On Mar 29, 2014, at 7:55 AM, robert bristow-johnson r...@audioimagination.com wrote: On 3/29/14 4:43 AM, Nigel Redmon wrote: 20 * log10(2^num_bits

Re: [music-dsp] Dither video and articles

2014-03-29 Thread Nigel Redmon
, at 12:55 PM, robert bristow-johnson r...@audioimagination.com wrote: On 3/29/14 12:37 PM, Nigel Redmon wrote: (Not address to you, Robert, because you know it well...) One thing people don’t realize is that integer processors like the 56k family had a full-precision accumulator for 24-bit

Re: [music-dsp] Dither video and articles

2014-03-30 Thread Nigel Redmon
to blind tests… :-/ On Mar 29, 2014, at 6:33 PM, robert bristow-johnson r...@audioimagination.com wrote: On 3/29/14 5:04 PM, Nigel Redmon wrote: Ah yes, the hated denormals—still not hard to deal with, but every once in a while, you get too comfortable and forget about them and... I meant easy

Re: [music-dsp] R: Dither video and articles

2014-03-30 Thread Nigel Redmon
Agreed, classical music has many characteristics that make it sensitive to truncation distortion. And speaking of pop music, fresh of Ian Shepherd’s Dynamic Range Day webcast… I happened to pull up vinyl today, unrelated to anything…I really wanted to get a decent digitization of an ancient

Re: [music-dsp] Combining ADCs/DACs to increase bit depth?

2014-04-25 Thread Nigel Redmon
Keep in mind that LSB accuracy is relative to the word size, typically (e.g., +/- one-half lsb). So, it’s not simply a matter of having one 8-bit DAC, and a second scaled to start at the 9th bit, to get 16-bit accuracy... On Apr 25, 2014, at 9:35 AM, David Moylan d...@westphila.net wrote:

Re: [music-dsp] new shade of pink

2014-05-07 Thread Nigel Redmon
A very nice idea and article, thanks Stefan! On May 7, 2014, at 1:20 AM, Stefan Stenzel stefan.sten...@waldorfmusic.de wrote: Quick and quite accurate pink noise generator, maybe useful for someone: http://stenzel.waldorfmusic.de/post/pink/ Stefan -- dupswapdrop -- the music-dsp mailing

Re: [music-dsp] a weird but salient, LTI-relevant question

2014-05-07 Thread Nigel Redmon
Reminds me…a few decades ago at Oberheim…Tom O. lamented to me bout a seemingly minor decision he’d made and later regretted…replacing an analog noise source with a digital noise generator (OBX—same in the Prophet 5). He took a bunch of grief from a guy who liked to meditate to noise, bought

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