Questions tagged [ssqueezepy]
Synchrosqueezing, wavelet transforms, and time-frequency analysis in Python.
11
questions
0
votes
1
answer
129
views
ICWT filtering signal with a cut-off frequency
In ssqueezepy, by finding a certain scale is it possible to do an icwt only for the scales above (or bellow) ? For exemple if I have a double sin (with $f_1$ and $f_2$), by taking the frequency $f_c$ ...
- 11
0
votes
1
answer
39
views
Zeroing input frequencies to improve inverse CWT
This is a follow up of my previous question Why is inverse CWT inexact / inaccurate?
Rephrasing its accepted answer in my own words:
The filterbank's transfer function gives information on what band ...
- 117
1
vote
1
answer
204
views
Why is inverse CWT inexact / inaccurate?
I'm all new to wavelet analysis. I'm trying to get a working understanding of the continuous wavelet transform and its inverse.
By "working understanding", I really mean "getting some ...
- 117
1
vote
1
answer
169
views
What do computed CWT frequencies and color values correspond to?
I wanted to make wavelet transform and represent the frequencies as function of time instead of the scale of the wavelet as function of time. This example that uses ...
- 55
3
votes
1
answer
209
views
Why are wavelet transforms implemented in Python/Matlab often called Continuous wavelet transform when they take discrete-time input?
The implementations of Synchrosqueezing wavelet transform in Python (ssqueezepy) and MATLAB both write in their documentation that they implement the synchrosqueezing algorithm on the Continuous ...
- 31
0
votes
1
answer
248
views
Inverse continuous wavelet transform, how to obtain fluctuations at a given scale with ssqueezepy?
How can I obtain the fluctuations of a timeseries at a specific scale using the ssqueezepy library for inverse continuous wavelet transform (ICWT)?
I have a minimum reproducible example that uses the ...
- 179
2
votes
2
answers
337
views
Interpretation of wavelet trasformation (synchrosqueezing)
I'm working on a dataset of spectroscopies and i'm classifying them by transforming the 1D signal into a 2D one by the ssqueezepy library.
For instance, consider to ...
- 21
0
votes
1
answer
310
views
Not showing the right frequency in ssqueezepy CWT plot
I am following the ssqueezepy simple example.
The plot should show f=12 but it shows around 33.
Is this a bug or have I scaled the y-axis wrong?
Also the plot is not a straight plot as it waves at ...
- 127
0
votes
0
answers
169
views
Why have steps when using ssqueezepy to calculate instantaneous frequency?
I'm using ssqueezepy to calculate signal's instantaneous frequency, The method like below:
...
- 1
1
vote
1
answer
622
views
How to make a time/period (1/frequency) plot with CWT
This is a question about producing a time/period (1/frequency) plot from a CWT, instead of the time/scale output. I am trying to use the ssqueezepy python library to perform the CWTs. Then I ...
- 280
2
votes
2
answers
728
views
Why does a synchrosqueezed wavelet transform show oscillating behavior?
This question came up in the context of the ssqueezepy library. As a basic experiment I did compute the synchrosqueezed wavelet transform of three basic signals:
A ...
- 543