import numpy as np

import matplotlib.pyplot as plt
import fft

class IIR_1_Order_LP(object):
	"""docstring for fft_meas"""
	def __init__(self, fs, fc=200):
		self.fs = fs
		self.fc = fc
		self.dt = 1/self.fs
		self.RC = 1 / (2*np.pi*self.fc)
		self.alpha = self.dt / (self.RC + self.dt)

		self.y = 0

	def step(self, x):
		self.y = self.y + self.alpha * (x - self.y)
		return self.y