peak integration using trapz but not starting from baseline and visualization Question: I am trying to integrate signal peaks using numpy.trapz or scipy.trapz. I do manually select the range of a peak min and max. the problem I am facing is that I think these functions integerates the AUC till the baseline. Sometimes my signal …
Explanation of signal.find_peaks() approach Question: I have looked through the scipy.signal docs for an explanation of the peak finding approach used in find_peaks() and have been unable to find an explanation similar to the excellent explanation given but the cwt peak finding approach. Is anyone here able to explain the peak finding approach used by …
Matlab Dirichlet kernel equivalent in Python? Question: Is there an equivalent in Python for Matlab diric? The Dirichlet kernel DL(ω) is: DL(ω) = sin(ωL/2) / sin (ω/2) I found scipy.stats.Dirichlet, but that’s not related. That’s no big deal to write the expanded form, but there is a limit to manage: DL(0) = L. Asked By: …
How to create a 2D array of weighted+shifted unit impulses? Question: I’m looking for an efficient way to get a 2D array like this: array([[ 2., -0., -0., 0., -0., -0., 0., 0., -0., 0.], [ 0., -1., -0., 0., -0., -0., 0., 0., -0., 0.], [ 0., -0., -5., 0., -0., -0., 0., 0., …
Detecting increasing trend and decreasing trend in time series data in Python Question: I need to find the window of increasing trend and decreasing trend in a time series data. For example in the below plot, it has 3 increasing trend and 2 decreasing trend. I need identify the windows having this trend. I tried …
Fourier transform of 2D Gaussian kernel is not matching up with its counterpart in the spatial domain Question: We know the Fourier transform of a Gaussian filter is again Gaussian in the frequency domain, I have written the following method to build a Gaussian kernel: def get_gaussian(size, sigma): g_kernel = np.zeros((size,size)) x_center = size // …
IndexError when using Enumerated Indexes in NumPy Question: I am trying to create a fifth-order FIR filter in Python described by the following difference equation (apologies dark mode users but LaTeX is not yet supported on SO): def filter(x): h = np.array([-0.0147, 0.173, 0.342, 0.342, 0.173, -0.0147]) y = np.zeros_like(x) buf_array = np.zeros_like(h) buf = …
Python Channelizer Question: After years of telling myself I would, I’m finally switching from MATLAB to Python. I am having difficulty finding a Python equivalent to MATLAB’s Channelizer. Is there one? Asked By: djg135 || Source Answers: Yes, PyFilterBank will do the trick. Answered By: Igor Rivin
Downsampling of timeseries results in artificial flattening of the power spectral density. Should I first apply low pass filter? Question: Edit: I have tried to incoroporate @dankal444 script. Even though it does indeed remove the high frequencies as shown in the second figure, I still get a flatter spectrum at high frequencies in the downsampled …
Slicing audio given video frames Question: I have audio from a video that I’ve loaded with PyTorch. Given a starting index and ending index corresponding to the video segment of interest, along with the video FPS and audio sampling rate, how would I go about extracting the slice of audio that matches the segment of …
