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Questions tagged [frequency-domain]

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How to extract the common part between two audio signals and remove it from the signal?

If I have two audio signals Y1 and Y2 in Fourier domain that are the results of multiplication of S with H1 and H2 respectively (convolution in time domain): Y1=H1*S Y2=H2*S And I don't have S and H1, H2, but I know that S is the same in both Y1 and…
Atra Es
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Harmonic mean when a DC signal is present

I have an output from a noisy signal, saved as a set of cosines. I have a set of frequencies from 0 to x Hz (x is a large number), and a set, of the same size, of amplitudes. I want to work out the harmonic mean of the frequencies present, when the…
William
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How to plot the magnitude and phase of a frequency?

I was reading Practical Introduction to Frequency Domain Analysis. It shows how to observe the frequency content of a signal using this code: Fs = 44100; y = audioread('guitartune.wav'); NFFT = length(y); Y = fft(y,NFFT); F =…
template boy
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How to determine periodicity from FFT?

Let's say I have some data that corresponds to the average temperature in a city measured every minute for around 1 year. How can I determine if there's cyclical patterns from the data using an FFT? I know how it works for sound... I do an FFT of a…
Luis Cruz
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B&W Dots in Frequency domain figure of an image

I have this simple line of code that reads an image and takes a fourier transform of the image using fft2 function of matlab and then bringing the lower frequencies to the center of the figure by fftshift. The problem is that in the figure of the…
Bavafaali
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Get Exact Frequency From Digital Signal

I studies on Digital Signal Filtering and I have a file includes some signal data. I wrote Matlab Program to get 23 to 27 Hz from original signal. but filtered signal is different. my desire filter is bandpass but my code work like low pass…
Alireza Izadimehr
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Filtering on Fourier image and then taking its Inverse fourier to get the image

// Fourier transform of Image orig object. // output is matrix with 2 channels. private Matrix fourier() { Image image = orig.Convert(); IntPtr complexImage…
user3859323
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Why does convolution via multiplication in the frequency domain produce unexpected results MATLAB?

I'm trying to convolve a rectangular pulse with itself by taking the Fourier transform, squaring it, and then taking the inverse Fourier transform. I realize there is a conv() function but I would prefer to do it in the frequency domain for future,…
David Webb
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Cross-Correlation in Frequency and Spatial domain - Template Matching

So when I try to find a template B in a big image A, I can do it by finding the maximum of cross-correlation, like this in spatial domain: % Finding maximum of correlation: phi = normxcorr2(B,A); [ymax, xmax] = find(phi ==…
Vidak
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how to get the phasor(frequency domain) representation of a digitalized signal?

I know that we can get the phasor representation(frequency domain) of a signal through Fourier transform, but the picture above gives a method that can get the phasor representation of a signal in a different way, in this method according to the…
linuxfish
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Efficiency, Performance, and Effectiveness of Image Sharpening in Spatial and Frequency domain

My question has 2 parts, First part, is there a MATLAB function that generates a frequnecy domain mask that sharpens the edges of an image? Or do I have to create the mask in the spatial domain using fspecial() and then map it to the frequency…
Traveling Salesman
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FFT: time-domain features to frequency domain

I am not from Physics or electrical engineering, so the answers I read related to my only confused me the more. So I asked this case-specific question. I work with a sensor data (time series). The data consists of sensor values for 4 quantities (4…
Amina Umar
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Can `imfilter` work in the frequency domain?

According to this Quora answer, Gabor filter is a frequency domain filter. And, here is an implementation of Gabor filter which uses imfilter() to achieve the filtering, which means that imfilter() works in the frequency domain. Now, let us look…
user366312
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