All Questions
Tagged with signal-processing list-manipulation
15 questions
1
vote
1
answer
135
views
Track the location of of dot from noisy image
https://i.sstatic.net/QDXKL.jpg (subtraction between the image)
https://i.sstatic.net/9zqWV.jpg (orignal image)
From the original image, since my CCD camera is bad, I cannot really see anything.
...
- 1,830
1
vote
1
answer
231
views
Finding the phase difference between fundamental harmonics of two waveforms [closed]
I have two periodic non-sinusoidal waveforms $WV1$ and $WV2$ (See Figure). I want to extract the fundamental components of these two (i.e. $WV1_{F0}$ and $WV2_{F0}$) and find the peak amplitudes and ...
- 169
2
votes
3
answers
141
views
Signal Processing [closed]
The image above is the list plot of discrete data I'm working on. Please I need help on how to zero out all the high amplitudes signal from the data. That is all the data in areas circled, I want to ...
- 87
1
vote
1
answer
445
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remove noise while preserving peak
I have a data (see this link) which has some wiggles at both end.
I tried to apply different filters to smooth the data, like this
...
- 17.4k
2
votes
0
answers
171
views
Handling oscilloscope bitmap data
I'm using an oscilloscope from Tektronix; its output is formatted as a $n \times (m + 2)$ matrix, where $n$ is the number of vertical divisions and $m$ the temporal scale.
The first $9\times 2$ ...
- 361
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
5
votes
1
answer
398
views
Applying filters to data of the form {{x1,y1},{x2,y2},...}
When working with any kind of measurement data there is (at least) for me always a phase where I have to play around with different filters (such as MedianFilter, <...
- 8,529
9
votes
1
answer
2k
views
Finding outliers in 2D and 3D numerical data
I'm working on dataset which isn't normally distributed.which contains three dimensions like cost, discount and profit
I'm trying to find outliers in all these dimensions. I used z score to find ...
- 193
6
votes
3
answers
374
views
Find when two lists are parallel with autocorrelation
I am working on a signal processing project with two oscillators. The first oscillator has a frequency $f_1$ that is independent, and the second oscillator has a frequency $f_2$ that increases, and ...
- 1,496
1
vote
1
answer
168
views
How to find the starting point of an oscillation (with noise)?
I've got a series of coordinates which start to oscillate from some time (and with noise), like this:
...
- 887
19
votes
0
answers
440
views
Strategies to find curves on messy data using FindCurvePath
I have a set of data points that correspond to roots of a transcendental equation with respect to a parameter (the abscissa) which, by the properties of the system, define continuous curves (might be ...
- 1,619
5
votes
1
answer
2k
views
Convolve two sets of (x,y) data sets
I have two sets of data in the form
a={{.1,2},{.2,3},{.3,4},{.5,6}}
b={{0,8},{.1,4},{.2,7},{.3,1},{.5,10},{.6,3}}
Both data sets have even spacing, although ...
- 575
18
votes
3
answers
2k
views
What is Mathematica's equivalent to MATLAB's filter function?
The MATLAB code
filter(0.5,[1, -0.5], [1:10])
is equivalent to
Rest@FoldList[(#1 + #2)/2. &, 0, Range[10]]
I don't ...
- 15.8k
30
votes
4
answers
2k
views
Filtering beat-to-beat heart rate data
From an experiment, I have a dataset of beat-to-beat heart rate data: a list of the time between each heart beat in [ms].
The data is measured using an infrared optic sensor at the finger tip. The ...
- 1,638
23
votes
5
answers
16k
views
How to find the phase difference of two sampled sine waves?
I'm trying to measure a phase difference between two Sine functions I've acquired with a computer. I'm uploading one of the .txt files with the data I'm working with here: txt file. To remove the ...
- 327