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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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web audio analyzer on webrtc for remote stream

We are creating a audio video application which using webRTC. The problem is we are not able to show the stream spectrum for remote but for local we are able to. // setup a analyzer var analyser = audioCtx.createAnalyser(); …
Jeet
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Export audio file volume dB levels in Linux

I would like to be able to generate some sort of file that will store the volume levels of an audio file. I am pretty flexible about this but an example would be a csv that shows the volume every second. I don't need this number to be that…
hendr1x
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scaling of scipy.signal.welch: spectrum vs density

I need to estimate the power spectral density of some signal and use the welch algorithm as provided by scipy.signal for this aim. Even after hours of research I couldn't find out, what exactly is the difference in the output when I set the kwarg…
Olmo
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Real-Time FFT with High Resolution while Keeping Latency Low

I have read all the wikipedia articles and stackoverflow articles on fft and resolution. However, nothing has helped in learning how to get high resolution frequency without having a huge latency issues. If I understand signal processing…
Ryan
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C# get frequency spectrum lines of a .wav file

i want to display the frequency spectrum of a .wav (or .mp3) file. I stuck a little bit now and cant find anything good. I use C# with naudio nuget to handle the audio data and oxyplot to display the points (and the…
tuke307
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How to convert a female to a male voice using librosa?

how to convert man voice to women voice using librosa? I tried to convert the male voice into a female voice. I first read the wav file with librosa and then processed the audio time series with STFT,I hope that I can adjust the spectrum (increasing…
Shawn Plus
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Generate a quasi periodic signal

Is there a way to generate a quasi periodic signal (a signal with a specific frequency distribution, like a normal distribution)? In addition, the signal should not have a stationary frequency distribution since the inverse Fourier transform of a…
WANG Guosheng
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Oscillation and frequency spectrum through a Fourier transform

I'm trying to find the oscillation and spectrum frequency of the waveform generated by a vector of data representing the motion of a pixel in an image. The data is stored in a .txt file, as follows: 75.000000 60.000000 52.000000 61.000000…
Jorge Cruz
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Algorithm for automatic channel detection

I'm currently working on a spare-time project to perform automatic modulation classification (AMC) on radio signals (more precisely, I'm interested in L-band satellite channels), using SDR. I would like it to be able to discover channels in the…
BatchDrake
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Quill js color textbox

I would like to add a textbox for hex/rgb/rgba values in Quill's color options dropbox, so that my users can enter the color value they like, without being limited to the palette offered initially by Quill.js I tried to use Spectrum (…
user3356048
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How to extract the peak at a specific frequency in python

I want to know how much energy is at a specific frequency in a signal. I am using FFT to get the spectrum, and the frequency step is determined by the length of my signal. My spectrum looks, for example, like this : I want to get the spectrum peak…
FunkySheep
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AS3 computeSpectrum fft true

I am just trying to understand what the values sent back from computeSpectrum(bytes,true,0) mean. I have values ranging from 0 to 1 for each float i read from the byte array but does each value represent a range of Hz.
user238638
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how to convert normalized frequency to actual frequency

suppose that we have following code function [ x ] = generate1(N,m,A3) f1 = 100; f2 = 200; T = 1./f1; t = (0:(N*T/m):(N*T))'; %' wn = randn(length(t),1); %zero mean variance 1 x = 20.*sin(2.*pi.*f1.*t) + 30.*cos(2.*pi.*f2.*t) + A3.*wn; %[pks,locs] =…
user466534
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"Winamp style" spectrum analyzer

I have a program that plots the spectrum analysis (Amp/Freq) of a signal, which is preety much the DFT converted to polar. However, this is not exactly the sort of graph that, say, winamp (right at the top-left corner), or effectively any other…
cvb
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Right method for finding 2-D Spatial Spectrum from CSD

I try to implement the spatial spectrum from the above equation (attached) Where kX, kY are the grid points in k space, C(w,r) - cross spectral densities between the i'th and j'th sensor(here it is a matrix of size ns * ns >no. of sensors). x, y…
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