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Questions tagged [nyquist]

Use this tag for questions related to the Lisp-based Nyquist programming language dedicated to sound processing. Avoid using this tag for questions related to the Nyquist-Shannon sampling theorem or Strecker–Nyquist stability criterion.

nyquist is a programming language based on Lisp and dedicated to sound synthesis, analysis, and processing. The Audacity sound editor embeds a Nyquist interpreter and can run plug-ins written in the Nyquist language as well as ad-hoc Nyquist commands.

Nyquist is also available as a stand-alone interpreter often named ny.

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Is it reasonable that apply FFT after wavelet packet decomposition lv3

WPD = Wavelet Packet Decomposition Hello, dear Stack Overflow. I have questions for my time-series data. My data is a vibration of bearing in a machine or machine tool. We know that WPD works as a filter and is divided into 8 frequency bands: (ex -…
Loook -
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Drawing a Nyquist diagram animation on python

I am currently trying to create a python code that is supposed to draw an animated nyquist diagram and save it as a gif file. The problem is, I don't know how to make the animate function work. Here is a code I found on the internet that works: def…
Pedro Bremer
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Add white noise to chain in Audacity

I need to add white noise at a constant dB level to batches of sound files using Audacity. The Generate plugin 'Noise' is essentially what i'm looking for, but it can't be used to add noise to files in a chain since it overwrites each file rather…
Kris
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Nyquist plot and stability analysis for discrete systems in MATLAB

I'm trying to evaluate the stability of discrete systems by applying the Nyquist stability criteria for discrete systems in MATLAB. I'm referring to Digital Control Analysis and Design by Charles Philips and Troy Nagle. I need to evaluate the…
am3
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Changing resolution of the nyquist plot

I'm trying to check whether the system represented by h=tf([1, 1],[1 6 0 0]) is stable by the nyquist criterion. but when i put the commend 'nyquist(h)' at the matlab, i get only this graph clearly it's not the full sketch. how can i change it…
Zooly92
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Nyquist plot from experimental data

I'm trying to make a Nyquist diagram based on experimental data obtained with frequency, output, input respectively in excel for the system. Unfortunately I couldn't get any help with this problem so far and I haven't found anything relevant…
Niam
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How to see if the nyquist plot is stable or unstable?

Is there a method to determine the stability of the nyquist plot to check if it's stable or unstable ? I currently needs to manually input the transfer function to another m.file to view the pz location to determine syms s w G =…
Niam
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Calculate Nyquist Frequency of signal from a data set

I have a data set containing x (time) and y (concentration). Is it possible to calculate nyquist frequency from this ? From the below time series the y values are being generated by solving a system of ODE's. The time period of cycle is 24hrs (1440…
Nick
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Why Is it Impossible to Have a Noiseless Channel in Real Life

I'm in the middle of a course on networking and communications. So far I found the physical layer of communication the most interesting. There's one thing that bothers me though. Why is it impossible to have a noiseless channel?? When the Nyquist…
Oloff Biermann
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Nyquist plot from transfer function with quartic polinominal in denominator

So I have some very large and difficult transfer function, after some expanding and collecting by 's' in maple, i convert this to matlab and try to get nyquist plot, but this doesnt work. I am realy noob in this, why i cant take some plot. Also bode…
Tartachnyi
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SE MTF Nyquist plugin for images

I'd like to write a macro with SE MTF Nyquist plugin in fiji for a stack or many images in a directory. But I have to set some parameter for every image in a setting window. Any ideas? macro "TD2"{ inputFolder = getDirectory(''); outputFolder =…
Ludanyi
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Discretization of a continuous state-space model

I implemented the mathematical model of the inverted pendulum in Simulink following the paper http://www.uta.edu/utari/acs/ee4314/lectures/Lecture%207b.pdf (last page). My task now is to discretize such model and design a discrete controller in…
Alexis
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Nyquist plot for quasi polynomials

I want to analyze the quasi polynomial given as p(x)=x+exp(-x) using its Nyquist plot. I want the Nyquist plot of p(iw)/(iw+1). How to do this in Matlab? Please help.
user3563283
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Nyquist plot with one zero, four identical poles and one pole at origin

I am trying to draw the Nyquist plot of this transfer function 2 (s+1) / (s (s+10)^4) This is my code: NUM2 = [2 2]; DEN2 = [5 40 600 4000 10000 0]; FT2 = tf(NUM2,DEN2) fprintf ('\n Nyquist\n') figure(2) nyquist(FT2) This is the result: This is…
Nuno Fonte
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Split an audio file when a certain frequency occurs

I am working on a radio and we spend so much time to archive and upload the shows to our website, so we are searching for an "automatic" solution for that. What I came up with is to introduce a certain frequency to the starting and ending spot of…
user3426993
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