如何使用aubio获取python中一系列音调中每个音调的频率

Question

I found some example code for getting pitch using aubio, but I'm not sure what to change to get it to display the pitch in second increments:

import sys 
from aubio import source, pitch, freqtomidi

if len(sys.argv) < 2:
    print "Usage: %s <filename> [samplerate]" % sys.argv[0]
    sys.exit(1)

filename = sys.argv[1]
downsample = 1 
samplerate = 44100 / downsample
if len( sys.argv ) > 2: samplerate = int(sys.argv[2])

win_s = 4096 / downsample # fft size
hop_s = 512  / downsample # hop size


s = source(filename, samplerate, hop_s)
samplerate = s.samplerate

tolerance = 0.8 


pitch_o = pitch("yin", win_s, hop_s, samplerate)
pitch_o.set_tolerance(tolerance)

pitches = []
confidences = []

total_frames = 0 
while True:
    samples, read = s() 
    pitch = pitch_o(samples)[0]
    pitch = int(round(pitch))
    confidence = pitch_o.get_confidence()
    #if confidence < 0.8: pitch = 0.
    print "%f %f %f" % (total_frames / float(samplerate), pitch, confidence)
    pitches += [pitch]
    confidences += [confidence]
    total_frames += read
    if read < hop_s: break                                                                                                                                                                                  

Also, is it possible for me to do this directly from output instead of a wav file?

Answer 1

This script (also at aubio/python/demos/demo_pitch.py ) extracts pitch candidate for every audio frame (here 512./44100 * 1000 = 11.6ms ).

display the pitch in second increments

What do you mean by "in second increments"? The 'overall' pitch for each consecutive 1-second long segments? You could take np.median(pitches) .

The new pitch after each note change? You could process the output and group similar pitch candidates into notes.

Or just use aubionotes directly.

do this directly from output

From which "output" do you mean?

See also run aubiopitch continuously on a file descriptor .

Please ask your aubio questions @ https://github.com/aubio/aubio .