[music-dsp] Band-limited Hilbert transform kernel (and an open question about Biot-Savart)

Hi, list I saw the recent topic on IIR (approx) Hilbert transform pairs, worked with them in Pd for a while and tried to come up with FIR kernels that worked. I had been trying to generate them from the DFT, but there were systematic errors with that approach. I don't have much to offer on the

Re: [music-dsp] proper scaling of an FFT

On Wed, Nov 4, 2015 at 10:56 AM, Phil Burk wrote: > What is the "right" way to scale the inputs of an FFT. > > I have implemented some FFT functions in JSyn. The goal is to support > spectral analysis, processing and synthesis for music applications. > > I would like to be

Re: [music-dsp] Non-linearity or filtering

On Thu, Aug 13, 2015 at 1:05 PM, Tom Duffy tdu...@tascam.com wrote: WTF, who is trying to unsubscribe me: --- Mailing list removal confirmation notice for mailing list music-dsp We have received a request from 92.103.69.51 for the removal of your email

Re: [music-dsp] Non-linearity or filtering

*snores* Please have a civil conversation, and don't feed the trolls. If this isn't fun, what's it good for? A simple rhyme to remember: Make it moot and don't refute! Nobody reads every email on a mailing list. If you have a personal problem, consider a technical solution: email filtering

Re: [music-dsp] Sampling theorem extension

On Mon, Jul 13, 2015 at 8:39 AM, Charles Z Henry czhe...@gmail.com wrote: On Mon, Jul 13, 2015 at 3:28 AM, Vadim Zavalishin vadim.zavalis...@native-instruments.de wrote: On 10-Jul-15 19:50, Charles Z Henry wrote: The more general conjecture for the math heads : If u is the solution

Re: [music-dsp] Sampling theorem extension

On Mon, Jul 13, 2015 at 3:28 AM, Vadim Zavalishin vadim.zavalis...@native-instruments.de wrote: On 10-Jul-15 19:50, Charles Z Henry wrote: The more general conjecture for the math heads : If u is the solution of a differential equation with forcing function g and y = conv(u, v) Then, y

Re: [music-dsp] Sampling theorem extension

That's the point. You don't have to evaluate that integral, just numerically integrate the ordinary differential equation that follows from it to fill your wavetables. Charles Z Henry wrote: ... y=conv(u, f_s*sinc(f_s*t) ) Think about it that that is a shifting integral with an sin(x)/x

Re: [music-dsp] Fwd: Array indexing in Matlab finally corrected after 30 years!

On Wed, Apr 1, 2015 at 9:19 AM, robert bristow-johnson r...@audioimagination.com wrote: On 4/0/15 6:24 AM, Max wrote: I was glad to hear that Mathworks has finally corrected their array indexing scheme to start with 0 instead of 1, so they're now compatible with all the other languages out in

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

On Thu, Feb 5, 2015 at 5:10 AM, Peter S peter.schoffhau...@gmail.com wrote: On 05/02/2015, Nigel Redmon earle...@earlevel.com wrote: I would probably listen to both, if both were sharing information, and in a helpful way. I’m not implying that you aren’t (I don’t know—I’ve seen some of your

Re: [music-dsp] #music-dsp chatroom invitation

On Fri, Oct 10, 2014 at 8:02 AM, Theo Verelst theo...@theover.org wrote: So as soon as a communicating pair of neurons can be given an entropy value that's depending on if the unit is quarters or dimes, I fail to see the point. Oh, and meantsimlpon, because real neurons communicate depending

Re: [music-dsp] #music-dsp chatroom invitation

On Thu, Oct 9, 2014 at 5:34 AM, Peter S peter.schoffhau...@gmail.com wrote: The reason why there is no correlation between the time-domain PCM entropy and the rate of neural firing is this: One works in the time domain, another works in the frequency domain. No direct correlation. We mostly

Re: [music-dsp] #music-dsp chatroom invitation

Last time I listened to a guitar, it didn't have any bits. How would you define entropy for a single pluck from my guitar? See all I hear you keep arguing is about bits and quantization... Seems to be missing the point--you're assuming what the possible sets of things are by making them into

Re: [music-dsp] Ears and processing

On Tue, Oct 7, 2014 at 5:25 PM, sebfumas...@aol.com wrote: 3) a big bunch of nerves that carry those pulse-rate encoded signals into the brain, each corresponding to a single frequency. Since people with tinnitus conditions usually report hearing pure sinusoidal components (I can confirm that

Re: [music-dsp] #music-dsp chatroom invitation

We are all talking about analogies here for the type of processing being performed by a organism. Except Jon, who has mentioned measurements taken from an actual organism. Everyone else is not to be taken exactly literally. watch yer tone, Peter we're not idiots, because we didn't happen to

Re: [music-dsp] DFT by Simultaneous Equations

On Wed, Jul 9, 2014 at 6:58 AM, Filipe Pereira mmarnotopere...@gmail.com wrote: The first half of Smith's book is about real DFT and only after does he get into complex DFT. I have also been told that there are 2 N-point real and imaginary parts of the frequency domain, and the imaginary one is

Re: [music-dsp] DFT by Simultaneous Equations

On Tue, Jul 8, 2014 at 9:47 AM, Filipe Pereira mmarnotopere...@gmail.com wrote: Am I misreading something or is there a mistake in this explanation? Should it be 2 groups of N equations - N for the real and N for the imaginary part of the frequency domain? It would be a dis-service to your

Re: [music-dsp] Waveform with limited bandwidth wavetable lookup

Hi Nuno, I had once written a anti-aliasing table reader. This works with any arbitrary waveform. Starting with an interpolation function i(t) (a function that, when convolved with a dirac-delta comb multiplied by the sample values, reproduces a continuous function), we simply modify the

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

On Thu, May 8, 2014 at 12:59 AM, Enr G e.glerean@gmail.com wrote: My two cents as a person in the field: the human hearing system is kind of an LTI... LTI is a very specific thing. It's not sort of, kind of, LTI--it's just either LTI or not. only at very low level processing. The

Re: [music-dsp] Nyquista?Shannon sampling theorem

On Fri, Mar 28, 2014 at 4:07 AM, Emanuel Landeholm emanuel.landeh...@gmail.com wrote: Except for 1812 Overture. That sinks rather near DC at substantial amplitude, given the live cannon in the percussive section. As a human being, I tend to view DC as a non issue. I can't hear it so it may

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

On Tue, Mar 11, 2014 at 12:11 PM, Theo Verelst theo...@theover.org wrote: In this time where DSP and FFTs are become cheaper and cheaper per operation, I think it is interesting to know what is reasonable to expect from a sampled (digital) signal processing operator w.r.t. a familiar and

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

On Tue, Mar 11, 2014 at 5:52 PM, robert bristow-johnson r...@audioimagination.com wrote: On 3/11/14 5:18 PM, Charles Z Henry wrote: ... Information from every non-harmonic frequency is not lost: it is simply distributed into every harmonic frequency. The task is then to recover

Re: [music-dsp] Mastering correction by FFT-based filtering followed by 1 octave or 1/10 octave equalizer

On Thu, Mar 6, 2014 at 11:53 AM, Emanuel Landeholm emanuel.landeh...@gmail.com wrote: Continuing off topic... On correction; it's an interesting philosophical concept. I listen to lots of audio books, and the program material comes with all kinds of problems. Noise, too low volume due to

Re: [music-dsp] Negative PCA coefficients

Negative coefficients are like a negative correlation. I say like, because PCA gives you vectors of associated variables along which the variance in the data is decomposed. That's not exactly the same as correlation. The other part to pay attention is the eigenvalues. The largest components

Re: [music-dsp] Negative PCA coefficients

On Mar 4, 2014 1:16 AM, Linda Seltzer lselt...@alumni.caltech.edu wrote: And when some components have very small absolute values does that mean they can be omitted in an image of the component? Linda Seltzer Small values should not be simply omitted. It's sort of an effect size

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

On Mon, Feb 17, 2014 at 3:52 PM, Peter S peter.schoffhau...@gmail.comwrote: Okay, let's leave out quantum mechanics. It's mostly totally irrelevant for this discussion anyways, and it cannot be measured in practical ways. (For example, how do you know *for sure* that the magnetization

Re: [music-dsp] Square-summability for the ideal low pass filter

On Mon, Jan 13, 2014 at 3:24 AM, Dave Gamble davegam...@gmail.com wrote: Hi, Don't post MS word files to the list. Learn latex notation and use it as plain text. Any replies you get will be latex style, as is mine below. I do agree that MS word files would be hard to read for some

Re: [music-dsp] Frequency bounded DSP

missing? Last time I checked, all non-zero signals belong to a countably infinite basis. Uncountably many of them, even :P E Original message From: Charles Z Henry Date:01/03/2014 10:26 PM (GMT+05:30) To: A discussion list for music-related DSP Subject: Re: [music-dsp