Questions tagged [window]
The window tag has no usage guidance.
15
questions with no upvoted or accepted answers
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Separating out a sequence of DFTs with overlapping windows
Suppose I have a time series partitioned into $N$ equally-sized sections. Choosing some $k<N$, for each of the sections $i \in[0, N-k]$, I concatenate that section with the $k-1$ sections to the ...
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19
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Apply window taper for selected window or to full data block in algebraic problem with known frequencies?
First, I'd like to introduce a problem. I try to solve a set of linear equations in LS (Least Squares) sense, i.e. Ax=y (LS) => A^TA x = A^T y.
x is a vector I'm looking for, but y is a measured ...
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86
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Is there a window with both a lower side lobe level and higher side lobe roll of rate than Blackman
Is there a window with both a lower side lobe level and higher side lobe roll of rate than the Blackman window - even if it is poor or useless for some other reason?
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356
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Windowing a signal by using Hanning / Hamming or... zero padding?
My question is about the use of Hanning or Hamming windows versus "square" windows.
In my understanding, I will use a Hanning or Hamming window to limit the spectral leakage. But, on the second hand, ...
- 151
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33
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Where can I find more information about this formula relating a window's time and frequency size?
I remember having seen a formula of the form
$C=\frac{B}{L}$
that relates a duration $L$(s) of a window to its width $C$(Hz) in the spectrum (defined at -3dB or so). The constant $B$ would be ...
- 145
0
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1
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110
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properly windowing for better FFT signal
I have an analog signal as shown below.
As you can see it has a DC component, a 1MHz component and some high order component.
The period of the signal is 8.0199667µs.
I want to see a good accurate ...
- 13
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58
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How best analyze a very short data record (~100 data points) windowing and padding data to perform CWT
I have short segments of a biological signal interpolated at 10 Hz (anywhre from about 8.5 sec to 10 sec length). I want to use a cwt to then convert this segment to frequency over the short time ...
- 1
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176
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Window gain factor and amplitudes in FFT
I have some vibration data (acceleration) on which I need to perform an FFT, integrate it and again do an FFT.
I read that for the nature of the data that I have, the input to the FFT must be first ...
- 23
0
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76
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Blackman window magnitude attenuation
I am trying to compute the fundamental phasor using sliding window DFT. I have employed a Blackman window in conjunction i.e
$$
\sum_{k=0}^{L_{DFT}-1}x(k) w(k) e^{-j2\pi k/N}
$$
where $x(k)$ is the ...
- 15
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33
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How to specify a window?
I have developed my own window function for pre-processing signals prior to a DFT (FFT). How do I measure the performance of the window so that I can specify how good (or bad) it is? Maybe other ...
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154
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How to know the time of my window to calculate the STFT with python knowing only the length?
I am trying to implement a work presented in an IEEE paper where they have mentioned that the STFT was performed on the signal measurements to obtain a spectrogram with no overlap window of 3 min :
I ...
- 1
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193
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Band-pass filtering on whole signal or overlapping chunks?
I am working with a signal acquired by a pulse oximeter, i.e. a device that records the change of light intensity reflected by a specific tissue depending on its blood perfusion.
Since I am interest ...
- 105
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395
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Welch's Overlapped Method
I am measuring wind speed using a number of different anemometers. These anemometers are placed on a structure which exhibits sinusoidal motion. Thus, the signal of the anemometers contains both the ...
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-1
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1
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161
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DTFT of window function applied to input signal
$$x[n] = \cos(\omega_1n) + \cos(\omega_2n)$$
$w[n] = 1/N$ for $0 \leq n < N, 0$ for everything else
Find the DTFT of $y[n]=x[n]w[n]$ expressed by the DTFT of $w[n]$, $W(\omega)$
I was thinking ...
- 1
-1
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1
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662
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Should I use window or any filtering to average my data?
I have 80 seconds of data and I have to score my data by taking the average or median (or some other method) every 10 seconds. What's the best way to do this ? Should I just use a regular rectangular ...
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