Greetings. I have been using neural networks and other machine learning tools for sometime time. Yesterday the following question popped up in...

Greetings. I have been using neural networks and other machine learning tools for sometime time. Yesterday the following question popped up in my mind however: Why do we use machine learning tools when we could achive similar results with plain interpolation? Let's assume a noise free regression scenario (not classification and no measurement errors). In the case of infinite samples and...

Hello comp.dsp, I don't know if this is common knowledge, but, out-of-the-blue, I received an email from Trine-Lise Allnore, Rune's sister, on...

Hello comp.dsp, I don't know if this is common knowledge, but, out-of-the-blue, I received an email from Trine-Lise Allnore, Rune's sister, on 17-Nov-2018 which I quote below. Hi. I saw your question about my brother Rune, at a forum on the net. You postet It about 4-5 years ago, so you may not remember it.. Well, he comitted suicide in January 2012. You and another member of the ...

I know very few about communication protocols If I am to put my ideas practically, what hardware and software shall one need to create a small...

I know very few about communication protocols If I am to put my ideas practically, what hardware and software shall one need to create a small communication system. I am completely new to this. My wish is that I create a small communication system and transfer data.

I realise DSP engineers don't celebrate Xmas so I feel warranted in asking a question at this time of year. A quad-detector connected to say the...

I realise DSP engineers don't celebrate Xmas so I feel warranted in asking a question at this time of year. A quad-detector connected to say the shaft of a motor gives out pulses and senses direction. So it effectively gives out + or -1 which we count in the main loop which must execute at say within Ts seconds. Suppose there are thousands of pulses per revolution and my understand

Recursive least-squares (RLS). It's in all the books and countless times I have simulated white-noise or a square-wave going through a...

Recursive least-squares (RLS). It's in all the books and countless times I have simulated white-noise or a square-wave going through a discrete-time system and used RLS to get the parameters of the model. Works fine. Has anybody used it for real however ie not a simulation. I tried it with a large dc motor. I drove a white-noise generator into PWM and into the dc motor and did tests

Hi everyone, I've got only formula for filter and seeking for how to calculate coefficients: Do this code for every incoming sample in t1...

Hi everyone, I've got only formula for filter and seeking for how to calculate coefficients: Do this code for every incoming sample in t1 = dyn - in*c1 dyn = in + t1*c1 t2 = t1* c2 out = t2 + in* c3 dyn should be 0 at first sample i think c1,c2,c3 are coefficients t1,t2 and dyn are temporaries This suppose to be shelving filter and parameters are ...

Hi all. This is one of those questions that just popped into my mind last night: Who invented / discovered the airfoil? Like in...

Hi all. This is one of those questions that just popped into my mind last night: Who invented / discovered the airfoil? Like in aviation history. I know the Montgolfiers discovered the balloon, the Wright did the first powered flight and so on, but who was the first to describe the airforil as a component for 'heavier-than-air' flight? Lilienthal used devices very similar to what we t...

Reviewing some old stuff, I crossed the Sallen-Key filter. Analysis of this topology is relatively straightforward, but what I never sussed...

Reviewing some old stuff, I crossed the Sallen-Key filter. Analysis of this topology is relatively straightforward, but what I never sussed is the why - what makes it so important? What was the great advance, at that time? And is it still considered so consequential, today? -- Rich

.... I'm telling you why... Donald Knuth is coming to town! His annual Xmas Tree lecture. Yessir, the biggest event on the digital...

.... I'm telling you why... Donald Knuth is coming to town! His annual Xmas Tree lecture. Yessir, the biggest event on the digital calendar, Dec. 4, 6:30 PM, PST. Not to be missed by any nerd, geek, or those who aspire to such felicity. 'tree' is literal, as Knuth is the Duke of Graph Theory. Hand him any problem, he'll convert to a graph model, and go from there. There may n...

I've been laid-up for the past week or so, recovering from surgery, so I used the time to create a variant of Frequency Domain Least Squares...

I've been laid-up for the past week or so, recovering from surgery, so I used the time to create a variant of Frequency Domain Least Squares (FDLS) inspired by this ancient comp.dsp thread: https://groups.google.com/d/msg/comp.dsp/MOD86bo829Y/2BAVHOxK_yQJ Whereas standard FDLS takes a magnitude/phase frequency response and attempts to create a transfer function that matches it, "FDLS Allpas...