All Questions
Tagged with numpysignal-processing
16 questions
8votes
2answers
528views
Fourier Series of a given function
This is a very simple code that expresses a function in terms of Trigonometric Fourier Series and generates a animation based on the harmonics. I would like to know some ways to improve the ...
- 83
4votes
0answers
993views
Slow copying of memmap array to numpy array
I have multiple binary (structured) file, each of 2GB, which I am currently reading in pair, using memmap to cross-correlate the same. I want to minimise the time required by this IO process, in the ...
5votes
1answer
336views
Implementing 3Blue1Brown's description of Fourier transform in Python+numpy
I have implemented the 3Blue1Brown's description of Fourier transform in Python+numpy for irregular and unsorted data, as described here. ...
- 369
9votes
1answer
4kviews
Bilinear image interpolation
I have written a bilinear interpolant, which is working moderately well except that is painfuly slow. How can rewrite the code to make it faster? Using opencv directly isn't a valid answer. ...
- 295
3votes
1answer
1kviews
Hurst Exponent calculator
I am aiming to compute the Hurst Exponent of a 1-D signal time series in Python. For now, I have one existing function hurst(sig) which returns the Hurst exponent ...
2votes
0answers
2kviews
Gray-level co-occurrence matrix feature computation
I have many images and want to compute the GLCM properties for every image. Below my code that runs many hours to complete the task: ...
- 1,167
4votes
2answers
168views
Poor performance for signal processing
I have a program doing a LOT of iteration (thousands to millions to hundreds of millions). It's starting to take quite a lot of time (few minutes, to a few days), and despite all my effort to optimize ...
- 251
4votes
0answers
5kviews
Applying hysteresis to a signal
Using python 3.6. I have written this code (below) to apply hysteresis to a signal (a numpy array). My aim was to create a function that didn't require any loop to remember the previous state of the ...
4votes
2answers
225views
Temporal kernel filtering on video frames coming in a loop
I have a video which I read in a loop frame by frame. For every frame, I want to do temporal kernel filtering, the coefficients of which come from the input variable model (a dictionary). The temporal ...
- 159
2votes
1answer
1kviews
Find signal's maximum peak in window
I have a 9-dimensional signal (as a csv from this Gist) that looks like this: A signal peaks every 30 steps. I want to get the maximum values of the peaks in that ...
- 1,585
2votes
1answer
2kviews
Generate a random discrete signal
I currently have this code to generate a discrete signal with random amplitudes, but a fixed frequency: ...
- 1,585
9votes
4answers
17kviews
Recursively Save Python Dictionaries to HDF5 Files Using h5py
I have a bunch of custom classes for which I've implemented a method of saving files in HDF5 format using the h5py module. A bit of background: I've accomplished ...
- 103
12votes
1answer
12kviews
Simple Phase Locked Loop
Here is a simple Phase Locked Loop, which is a circuit used in radio communications for synchronisation between transmitter and receiver. The loop works by calculating the (phase) difference between ...
- 505
5votes
1answer
252views
Comparing FFTs to deduplicate IVR recordings
I've got a Python script that traverses two file trees, checking all .wav files for duplication. I'm still an undergrad, and have never worked with audio before. I'm not entirely sure this is going ...
- 153
6votes
1answer
2kviews
Python implementation of multidimensional power spectral density with Welch method
I have done my best to write Welch method implementation for python for multidimensional time series and still in the case of one dimensional time series I am getting inconsistent response compared to ...
- 191
