linear to log test

gistfile1.py

import math
import numpy as np
import matplotlib.pyplot as plt

a = np.arange(0, 1024)
lin_fft = 1.0 + np.sin(a)

frequencies = (a / 1024.0) * 22050

#plt.plot(frequencies, lin_fft)
#plt.show()

min_freq_i_care_about = 500
max_freq_i_care_about = 5000

my_freqs = np.logspace(math.log10(min_freq_i_care_about), math.log10(max_freq_i_care_about), num=256)
print my_freqs

my_fft = [np.interp(freq, frequencies, lin_fft) for freq in my_freqs]

plt.plot(my_freqs, my_fft)
plt.show()