Yell at the mic, see the frequencies on the terminal

aubio_mic_pitch

from aubio import source, pitch, freqtomidi, sink
from pysoundcard import Stream


if __name__ == '__main__':

  win_s = 1024  #fft size
  hop_s = 512   #hop size. Whatever that means

  s = Stream(block_length = hop_s)

  #Use yin algorithm. Better than normal fft and
  #more aligned with human perception of sound
  pitch_o = pitch("yin", win_s, hop_s, 44100)
  pitch_o.set_unit("freq")
  pitch_o.set_tolerance(0.8)

  s.start()

  while True:
    vec = s.read(hop_s)

    #s.input_channels =1. Creating a mono vector in 
    #case there is more than 1 channel
    mono_vec = vec.sum(-1)/float(s.input_channels)
    samples = mono_vec
    pitch = pitch_o(samples)[0]
    print pitch

  s.stop()