All Questions
Tagged with signal-processing wavelet-analysis
14 questions
0
votes
0
answers
152
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How to extract data from wavelet scalogram?
I've read several topics here concerning wavelets.
Especially this one is very useful where in the answer is explained how to convert default Mathematica scalogram into useful one (with frequency and ...
- 29
1
vote
0
answers
165
views
wavelet fourier transform
I want to do wavelet Fourier transform of my data but I have few doubts in this. 1)first of all what is octive and voice command here when i am changing value according to that my plot is changing but ...
- 11
2
votes
1
answer
228
views
Computing FundamentalFrequency
How does Mathematica use AudioLocalMeasurements to compute the fundamental frequency?
Is there any formula? I can't seem to find what method Mathematica makes use ...
1
vote
2
answers
204
views
How to detect the singular value with wavelet analysis
I have a series data
data=Uncompress[
FromCharacterCode[Flatten[ImageData[Import["https://i.sstatic.net/ApipY.png"],
"Byte"]]]];
We can show it
...
- 27.2k
6
votes
2
answers
433
views
How to calculate the amount of offset about two list
You can get my data by this code
{data1, data2} = Uncompress[FromCharacterCode@
Flatten[ImageData[Import["https://i.sstatic.net/ShSMY.png"], "Byte"]]];
We can ...
- 27.2k
8
votes
2
answers
404
views
How to detect discolorations in an image?
I'm evaluating the technical quality of an images and I'd like to scan it for defects from dirty sensors. Are there any filters to quickly detect a blob of discoloration? Here are a few examples:
- 31.8k
1
vote
0
answers
341
views
Wavelet Data Visualization (modus and phase) ListPlot [closed]
Due to ContinuousWaveletTransform[...] I can obtain information about wavelet-coefficient for example
...
- 11
8
votes
1
answer
3k
views
How to extract notes and chords from audio?
I have a 3-second recording of a guitar chord which you can safely download here. I'm trying to use Mathematica's wavelet features to find out the notes in the chord, at least the docs says that ...
- 31.8k
7
votes
0
answers
2k
views
Wavelet Transform Modulus Maxima (WTMM) method
Has anyone already coded the Wavelet Transform Modulus Maxima (WTMM) method for computing the singular spectrum using multi fractal formalism in Mathematica?
The goal is to analyse 1D, 2D and 3D data....
- 2,918
3
votes
2
answers
2k
views
Wavelet vs instantaneous power spectrum
Following on from a previous question posted by @xslittlegrass and answered by @Sector and others, Extracting information from the result of ContinuousWaveletTransform I'd like to know if it is ...
- 1,391
8
votes
3
answers
2k
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Signal processing by means of WaveletTransform
I updated my question to explain what I want.
I have the voltage-time curve from the real industial object. This curve was gotten from the digital oscilloscope:
As you can see it has hight-frequency ...
- 83
13
votes
1
answer
786
views
Wavelet transform order problem
I have a signal that I'm trying to study its time-frequency features by continuous wavelet transform. By choosing different wavelet order, I get some differences in the results.
...
- 27.8k
6
votes
3
answers
4k
views
How to increase Spectrogram resolution?
I have a time-domain signal that I want do a time-frequency analysis on it. When I tried the Spectrogram, I always get very low resolution.
For example:
I have a ...
- 27.8k
21
votes
1
answer
5k
views
Extracting information from the result of ContinuousWaveletTransform
I'm trying to analysis a signal and identify some time-frequency information of it. For example, around which time the specific frequency arrives. It appears that Mathematica has very powerful wavelet ...
- 27.8k