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How the window function works in STFT


How the window function works in STFT

By : Percy
Date : November 19 2020, 03:59 PM
hop of those help? note that, the width of the winow function is constant throughout the entire STFT process. and the time (t) in the function g(t-t') indicate sthat, t: is the current time on the time axis and it is variable each time the window is moved/shifted to the righ to overlap the main signal.
in other words, and i hope this clarifies better, the "t" at the end of the time axis is NOT the "t" in the function g(t-t'). as i stated earlir in the function g(t-t'), t: is the current time on the time axis and it is variable for each shift of the window function and t': is the width of the window and it is constant throughout the entire STFT process.
code :


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Draw Spectrogram STFT in C#, what function can I use?

Draw Spectrogram STFT in C#, what function can I use?


By : Vange123
Date : March 29 2020, 07:55 AM
wish of those help The WPF Sound Visualization Library isn't bad for this type of thing, although it doesn't have a spectrograph control.
WPF Sound Visualization Library Codeplex project with source
The onclick function works when inside an inline script but not in external js file due to window.onload = function(). R

The onclick function works when inside an inline script but not in external js file due to window.onload = function(). R


By : Euclid009
Date : March 29 2020, 07:55 AM
should help you out Change the name of variable stop so it isn't the same name as function
Declare both outside onload
code :
 var intervalStop; 
 function stop(){
      clearInterval(intervalStop);
 }
 var stop = setInterval(animate,60);
 intervalStop = setInterval(animate,60);
Specify number of samples in a segment for Short-time Fourier Transform using SciPy stft function

Specify number of samples in a segment for Short-time Fourier Transform using SciPy stft function


By : MzV
Date : March 29 2020, 07:55 AM
should help you out I wanted to perform Short-time Fourier Transform on my data with a specific sample length for each segment. I wanted to use the SciPy function stft from the signal submodule. However, when I create an audio array of length 10e5 the following way: , When I run your code snippet:
code :
In [1]: import numpy as np

In [2]: import scipy.signal as signal

In [3]: fs = 10e3 # Sampling frequency
   ...: N = 1e5 # Number of samples
   ...: time = np.arange(N) / fs
   ...: x = 500*np.cos(time) # Some random audio wave
   ...:

In [4]: f, t, Zxx = signal.stft(x, fs, nperseg=1000)
   ...: print(Zxx.shape) # -> (501, 20001)
   ...:
(501, 201)
In [7]: f, t, Zxx = signal.stft(x, fs, nperseg=1000, noverlap=0)

In [8]: Zxx.shape
Out[8]: (501, 101)
Function works in immediate window but not in worksheet?

Function works in immediate window but not in worksheet?


By : Ilaila Alina Krasavi
Date : March 29 2020, 07:55 AM
seems to work fine Your code cannot work as a function called directly from a worksheet. VBA UDF's are restricted as to what they can do.
https://support.microsoft.com/en-us/help/170787/description-of-limitations-of-custom-functions-in-excel
STFT computation without using spectrogram function!

STFT computation without using spectrogram function!


By : OnionKnightThe
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I am not sure what your question exactly is about, but I guess the problem is, with the provided code, that you do not get a plot similar to the one you'd get, say, with surf.
Furthermore, I am also not quite sure why you would want to use plot3, maybe to get the labels on the time and frequency right ? you could do that all the same with surf:
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