Re: [music-dsp] BW limited peak computation?

TL; DR A high-pass filter? The first and second derivatives could be easily enough described with first and second-order feedback filters, respectively, but once you start fitting that stuff into DSP terminology, then you might as well make a low-order high-pass filter that has the

Re: [music-dsp] BW limited peak computation?

Hi, I missed this thread until now. Last year, I published an article on this topic here: https://techblog.izotope.com/2015/08/24/true-peak-detection/ In it is included a proof that the true peak can be unboundedly higher than the sample peak. Thanks, -Russell On Mon, Aug 1, 2016 at 5:05 PM,

Re: [music-dsp] BW limited peak computation?

Paul Stoffregen wrote: Does anyone have any suggestions or references for an efficient algorithm to find the peak of a bandwidth limited signal? Hi, I think without getting lost in quadratic algebra or endless searches for a holy grail that doesn't exist that I don't take part in, you've

Re: [music-dsp] BW limited peak computation?

2016-07-29 8:55 GMT+02:00 : > > On Jul 25, 2016, at 3:20 PM, Stefano D'Angelo wrote: > >> Otherwise, you might very well use higher-order (i.e., not just >> linear) interpolators, (e.g., not-a-knot cubic spline interpolator), > > What is a "not-a-knot

Re: [music-dsp] BW limited peak computation?

> Because I don't think there can be more than one between any two > adjacent sampling times. > > > This really got the gears turning. It seems true, but is it a theorem? > If not, can anyone give a counterexample? > I don't know whether it's a classical theorem, but I think it is true.

Re: [music-dsp] BW limited peak computation?

On 28/07/2016 12:04 AM, Ethan Fenn wrote: Because I don't think there can be more than one between any two adjacent sampling times. This really got the gears turning. It seems true, but is it a theorem? If not, can anyone give a counterexample? I don't know whether it's a classical

Re: [music-dsp] BW limited peak computation?

r of your choice. -Ethan On Wed, Jul 27, 2016 at 1:29 AM, robert bristow-johnson < r...@audioimagination.com> wrote: > > > Original Message ---- > Subject: Re: [music-dsp] BW limited peak computation? > From: "Ross B

Re: [music-dsp] BW limited peak computation?

Original Message Subject: Re: [music-dsp] BW limited peak computation? From: "Ross Bencina" <rossb-li...@audiomulch.com> Date: Tue, July 26, 2016 6:21 pm To: music-dsp@mu

Re: [music-dsp] BW limited peak computation?

On 27/07/2016 7:09 AM, Sampo Syreeni wrote: Now, what I wonder is, could you still somehow pinpoint the temporal location of an extremum between sampling instants, by baseband logic? Because I don't think there can be more than one between any two adjacent sampling times. Presumably the

Re: [music-dsp] BW limited peak computation?

On 2016-07-26, Stefan Stenzel wrote: the acid test is when the pre-upsampled data is alternating signs on a large amplitude with *one* sample missing. like: ... -A, +A, -A, +A, -A, +A, -A, +A, -A, +A, -A, +A, -A, +A, -A, +A, -A, +A, +A, -A, +A, -A, +A, -A, +A, -A, +A, -A, +A, -A, +A, -A,

Re: [music-dsp] BW limited peak computation?

Paul, It all depends what you consider a peak. Imagine a single sample of one, surrounded by nothing but zeros left and right, upsampling this signal would bring up many peaks that you might not be interested in. For practical purposes I suggest you start with the simple approach to search

Re: [music-dsp] BW limited peak computation?

I suggest the cubic spline interpolator. It expresses the underlying function as piecewise trinomial so that the maxima/minima can be computed by solving binomial equations. It is also known to be close to the ideal sync interpolation alias-wise. Xue From: Paul

Re: [music-dsp] BW limited peak computation?

2016-07-25 23:00 GMT+02:00 Paul Stoffregen : > > Does anyone have any suggestions or references for an efficient algorithm to > find the peak of a bandwidth limited signal? > > If I just look only at the numerical values of the samples (yeah, that's what > I've been doing), when a