vmdpy 0.1

Variational Mode Decomposition (VMD) algorithm

Variational mode decomposition Python Package

Function for calculating Variational Mode Decomposition (Dragomiretskiy and Zosso, 2014) of a signal
Original VMD paper:
Dragomiretskiy, K. and Zosso, D. (2014) ‘Variational Mode Decomposition’, IEEE Transactions on Signal Processing, 62(3), pp. 531–544. doi: 10.1109/TSP.2013.2288675.

original MATLAB code: https://www.mathworks.com/matlabcentral/fileexchange/44765-variational-mode-decomposition

Installation

1. Dowload the project from https://github.com/vrcarva/vmdpy, then run "python setup.py install" from the project folder

OR

2. pip install vmdpy

Citation and Contact

If you find this package useful, we kindly ask you to cite it in your work.
Vinicius Carvalho (2019-), Variational Mode Decomposition in Python

A paper will soon be submitted and linked here.

contact: [e-mail]
Vinícius Rezende Carvalho
Programa de Pós-Graduação em Engenharia Elétrica – Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
Núcleo de Neurociências - Universidade Federal de Minas Gerais

Example script

#%% Simple example  
import numpy as np  
import matplotlib.pyplot as plt  
from vmdpy import VMD  

#. Time Domain 0 to T  
T = 1000  
fs = 1/T  
t = np.arange(1,T+1)/T  
freqs = 2*np.pi*(t-0.5-fs)/(fs)  

#. center frequencies of components  
f_1 = 2  
f_2 = 24  
f_3 = 288  

#. modes  
v_1 = (np.cos(2*np.pi*f_1*t))  
v_2 = 1/4*(np.cos(2*np.pi*f_2*t))  
v_3 = 1/16*(np.cos(2*np.pi*f_3*t))  

f = v_1 + v_2 + v_3 + 0.1*np.random.randn(v_1.size)  

#. some sample parameters for VMD  
alpha = 2000       # moderate bandwidth constraint  
tau = 0.            # noise-tolerance (no strict fidelity enforcement)  
K = 3              # 3 modes  
DC = 0             # no DC part imposed  
init = 1           # initialize omegas uniformly  
tol = 1e-7  


#. Run actual VMD code  
u, u_hat, omega = VMD(f, alpha, tau, K, DC, init, tol)