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Questions tagged [spectrum]

The frequency domain of a wave-like function.

Spectrum refers to the full range of all frequencies of electromagnetic radiation. Spectrum has since been applied by analogy to topics outside of electromagnetic radiation. For a complete discussion, see the Wikipedia Spectrum article

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Waterfall diagram color calculation

I've written a class based on JPanel which displays an waterfall diagram, based on data I am getting from a FFT analysis of an audio signal. The question is: How to determine the color to use? My current function to do this looks like this: /** *…
gorootde
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phase spectrum of signal wrong generation matlab

I've got 129 samples of some signal. I have to discover what signal it is (what components it has) and try to reconstruct it. so after I have done FFT i wanted to find phase of signal so i try: phs=unwrap(angle(y)); …
Matt
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Implementation of a Least mean squares adaptive filter (LMS)

Designing an adaptive filter (example : LMS filter http://en.wikipedia.org/wiki/Least_mean_squares_filter) is highly technical and would need high skills in signal processing in order to code such a filter. Do you think there is somewhere a…
Basj
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Spectrum Analysis of 1D Signal (FFT etc.)

I have two Signals: a noisy Input-Signal and a filtered OutputSignal. The Noise-Filter has been implemented with a Kalman-Filter. Please click on the link below to see the signals! As I see it, the Signals have two main Frequencies: first of all the…
Hanshans
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Radially Power Spectrum Analysis

First - I need to plot this radially averaged spectrum 1-D, against the wavenumber |k|. But early I calculate the |k| using two matrix, so I have a matrix that represent |k|. So I have to radial average this matrix too? Second - If I remove a mean…
Wanderson Ferreira
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AS3 Spectrum visualization based on local sound driver played sound?

Question? I was wondering if it is possible to access information on the sound currently being played locally(Sound not originating from the AIR app) with AS3? My goal: Say I'm running iTunes, or spotify with my favorite song, And then i open up my…
Michell Morsø
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DFT Matlab function

I've write a function that calculates the DFT of an image, My prupose is to show the amplitude spectrum without using the fftshift command. DFT_img.m looks like this: function f = DFT_img(a); [n m]=size(a); for i =1:n k=1; for j =1:n …
ah92
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extracting frequency of signal from FFT

I am new to Matlab and FFT. I need to extract the dominant frequency from a signal which is varying in magnitude and frequency. I tried to perform a detrend and then an FFT to obtain the frequency but couldn't get rid of the large peak at 0Hz (DC…
user2264645
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Audio spectrum analyzer for Windos Store App

I want to add a spectrum analyzer to my Windows Store Application. Are there any libraries that allow to do this? I write my application using C#/XAML. P.S. It must not necessarily be a spectrum analyzer. It can be something that allows me to…
Dmitry Salenko
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Sound to 3 main frequencies(low, mid, high)

I have made some research but I couldn't find what I am exactly looking for. At the moment, I have to send channel values by com port. For example: the content of file freqs.ini low=0-xx khz; mid=xx-yy khz; high=yy-zz khz; Then I will get…
Yağız Elesković
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How can I vectorize the calculation of a multi-taper spectrum?

Normally I compute the spectrum of a signal using pmtm: signal = rand(1000,1); NW = 4; Fr = 1:50; Fs = 200; [p, fr] = pmtm( signal, NW, Fr, Fs); However I'm looking for a way to vectorize this so I can compute multiple spectra at the same time. I…
slayton
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How to generate Audio Spectrum when you play audio file from remote url?

I have one screen in which i have created my custom audio player where i play the audio file which received from the webservice.I am successfully done this part. Now , as per the audio file i want to generate an audio spectrum of that audio file. I…
AndroidLearner
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Converting NMR ascii file to peak list

I have some Bruker NMR spectra that i am using to create a program as part of a project. My program needs to work on the actual spectrum. So i converted the 1r files of the Bruker NMR spectra to ASCII. For Carnitine this is what the ascii file looks…
Chaitanya Nettem
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How to remove background grids in gnuplot. ?? I want plain bg and getting dotted rectangular grids

I have already plotted eigenvalue spectrum but want to see it on plain white back ground . Someone please help to remove thode grid lines
Vidula Shevade
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How to interpret FFT data for making a spectrum visualizer

I am trying to visualize a spectrum where the frequency range is divided into N bars, either linearly or logarithmic. The FFT seems to work fine, but I am not sure how to interpret the values in order to decide the max height for the…
Alx
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