endolith

from numpy import linspace, cos, pi, absolute
from numpy.fft import fft, fftfreq, fftshift
import matplotlib.pyplot as plt

# Sampling rate
fs = 64  # Hz

# Time is from 0 to 1 seconds, but leave off the endpoint, so
# that 1.0 seconds is the first sample of the *next* chunk
length = 1  # second