Comparative Evaluation - Melodic Masks¶
This notebook makes a comparative evaluation of all melodic masks produced with the spectrogram of the real melodic source espectrogram. The measure used was the norm of the difference between the spectrograms.
The values of difference are not perceptually equivalents, some values are greater but perceptually the results could be similar, on the other hand, small values could be perceptually relevants. Then, this measure is only to quantify the precision of information retrieval of the separation.
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import librosa
import scipy
import matplotlib.pyplot as plt
import numpy as np
%matplotlib inline
# Open annotation file
import csv
# Get signal processing functions
import scipy.signal as signal
# Make melodic mask
import src.core as utils
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# Example 1 - Woman Singer
audio_path = '../../../MedleyDB/Audio/LizNelson_Rainfall/LizNelson_Rainfall_MIX.wav'
# Annotation 1
annot_path = "../../../MedleyDB/Annotations/Melody_Annotations"\
+"/MELODY1/LizNelson_Rainfall_MELODY1.csv"
# Melody audio
melody_path = "../../../MedleyDB/Audio/LizNelson_Rainfall/LizNelson_Rainfall_RAW/"\
+"LizNelson_Rainfall_RAW_01_01.wav"
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# Example 2 - Guitar solo
audio_path = '../../../MedleyDB/Audio/ChrisJacoby_BoothShotLincoln/'\
+'ChrisJacoby_BoothShotLincoln_MIX.wav'
# Annotation 2
annot_path = "../../../MedleyDB/Annotations/Melody_Annotations"\
+"/MELODY1/ChrisJacoby_BoothShotLincoln_MELODY1.csv"
# Melody audio
melody_path = "../../../MedleyDB/Audio/ChrisJacoby_BoothShotLincoln"\
+"/ChrisJacoby_BoothShotLincoln_RAW/ChrisJacoby_BoothShotLincoln_RAW_02_01.wav"
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# Example 3 - Man Singer
audio_path = '../../../MedleyDB/Audio/Debussy_LenfantProdigue/'\
+'Debussy_LenfantProdigue_MIX.wav'
# Annotation
annot_path = "../../../MedleyDB/Annotations/Melody_Annotations"\
+"/MELODY1/Debussy_LenfantProdigue_MELODY1.csv"
# Melody audio
melody_path = "../../../MedleyDB/Audio/Debussy_LenfantProdigue/"\
+"Debussy_LenfantProdigue_RAW/Debussy_LenfantProdigue_RAW_01_01.wav"
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# Example 4 - Orchestra Example
audio_path = '../../../MedleyDB/Audio/MusicDelta_Beethoven/'\
+'MusicDelta_Beethoven_MIX.wav'
# Annotation
annot_path = "../../../MedleyDB/Annotations/Melody_Annotations"\
+"/MELODY1/MusicDelta_Beethoven_MELODY1.csv"
# Melody audio
melody_path = "../../../MedleyDB/Audio/MusicDelta_Beethoven/"\
+"MusicDelta_Beethoven_RAW/MusicDelta_Beethoven_RAW_06_01.wav"
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# Example 5 - Punk
audio_path = '../../../MedleyDB/Audio/MusicDelta_Punk/'\
+'MusicDelta_Punk_MIX.wav'
# Annotation
annot_path = "../../../MedleyDB/Annotations/Melody_Annotations"\
+"/MELODY1/MusicDelta_Punk_MELODY1.csv"
# Melody audio
melody_path = "../../../MedleyDB/Audio/MusicDelta_Punk/"\
+"MusicDelta_Punk_RAW/MusicDelta_Punk_RAW_04_01.wav"
Notebook structure:
- Load an audio file
- Compute the spectrogram, get melodic line
- For each strategy:
- Compute the melodic mask and apply it to the audio and to the melodic instrument
- Compute the norms between these masks and define the measures
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audio, sr = librosa.load(audio_path, sr=44100)
# Calculate the complex spectrogram
D = librosa.stft(audio, window=signal.cosine)
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melody = []
timestamps = []
with open(annot_path) as csvfile:
reader = csv.reader(csvfile)
for row in reader:
timestamps.append(float(row[0]))
melody.append(float(row[1]))
# Append element to make size equal of spectrogram
melody.append(0)
timestamps.append(0)
# None to values less equals 0
melody_pos = melody[:].copy()
for i in range(len(melody_pos)):
if melody_pos[i] <= 0:
melody_pos[i] = None
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# Load the melodic instrument audio
melodyAudio, sr = librosa.load(melody_path, sr=44100)
# Calculate the complex spectrogram
M = librosa.stft(melodyAudio, window=signal.cosine)
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def evaluateMask(specMelodic, D, M):
MaskInstrument = specMelodic.astype(float)*M
MaskMusic = specMelodic.astype(float)*D
R = (np.linalg.norm(MaskInstrument)/np.linalg.norm(M))**2
print ("Accuracy ", R)
P = (np.linalg.norm(MaskInstrument)/np.linalg.norm(MaskMusic))**2
print ("Noise Level ", P)
F1 = 2 * P * R / (P + R)
print ("F-measure ", F1)
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def saveAudio(name, spec):
# Save the audio signal melodic
y_m = librosa.core.istft(spec)
librosa.output.write_wav(name, y_m, sr, norm=False)
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def plotSpectrograms(inst, mask):
plt.figure(figsize=(13,4))
librosa.display.specshow(librosa.logamplitude(np.abs(inst)**2, ref_power=np.max),
y_axis='log', x_axis='time', sr=sr)
plt.colorbar(format='%+2.0f dB')
plt.title('Melodic spectrogram created by Melodic Mask 1')
plt.show()
plt.figure(figsize=(13,4))
librosa.display.specshow(librosa.logamplitude(np.abs(mask)**2, ref_power=np.max),
y_axis='log', x_axis='time', sr=sr)
plt.colorbar(format='%+2.0f dB')
plt.title('Melodic spectrogram from Melodic Instrument')
plt.show()
Example 1¶
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# Generate a melodic mask based on Melodia contours
specMelodic = utils.generateMelodicMask(D, melody, kind=1)
evaluateMask(specMelodic, D, M)
plotSpectrograms(M, specMelodic)
saveAudio("example_1_melody.wav", specMelodic.astype(float)*D)
Example 2¶
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# Generate a melodic mask based on Melodia contours
specMelodic = utils.generateMelodicMask(D, melody, kind=2, n_harm=50)
evaluateMask(specMelodic, D, M)
plotSpectrograms(M, specMelodic)
saveAudio("example_2_melody.wav", specMelodic.astype(float)*D)
Example 3¶
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specMelodic = utils.generateMelodicMask(D, melody, kind=3, n_harm=50)
evaluateMask(specMelodic, D, M)
plotSpectrograms(M, specMelodic)
saveAudio("example_3_melody.wav", specMelodic.astype(float)*D)
Example 4¶
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# Generate a melodic mask based on Melodia contours
specMelodic = utils.generateMelodicMask(D, melody, kind=3, n_harm=50)
specMelodic = utils.spectralNoveltyFunction(D, specMelodic)
evaluateMask(specMelodic, D, M)
plotSpectrograms(M, specMelodic)
saveAudio("example_4_melody.wav", specMelodic.astype(float)*D)
Example 5¶
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# Generate a melodic mask based on Melodia contours
specMelodic = utils.generateMelodicMask(D, melody, kind=3, n_harm=50)
specDilated = utils.spectralNoveltyFunction(D, specMelodic)
# Getting masks from librosa
mask_H, mask_P = librosa.decompose.hpss(D, mask=True)
specPercuss = np.maximum(np.multiply(specDilated, mask_P), specMelodic)
specMelodic = specPercuss
evaluateMask(specMelodic, D, M)
plotSpectrograms(M, specMelodic)
saveAudio("example_5_melody.wav", specMelodic.astype(float)*D)
Example 6¶
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# Generate a melodic mask based on Melodia contours
# You also can define the number of harmonics
specMelodic = utils.generateMelodicMask(D, melody, kind=3, n_harm=50)
specHit, specHitDilated, specMax = utils.hitMissDilateMask(specMelodic)
del specHit, specHitDilated
specMelodic = specMax
evaluateMask(specMelodic, D, M)
plotSpectrograms(M, specMelodic)
saveAudio("example_6_melody.wav", specMelodic.astype(float)*D)
Example 7¶
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# Generate a melodic mask based on Melodia contours
# You also can define the number of harmonics
specMelodic = utils.generateMelodicMask(D, melody, kind=3, n_harm=50)
specHit, specHitDilated, specMax = utils.hitMissDilateMask(specMelodic)
del specHit, specHitDilated
# Getting masks from librosa
mask_H, mask_P = librosa.decompose.hpss(D, mask=True)
specPercuss = np.maximum(np.multiply(specMax, mask_P), specMelodic)
specMelodic = specPercuss
evaluateMask(specMelodic, D, M)
plotSpectrograms(M, specMelodic)
saveAudio("example_7_melody.wav", specMelodic.astype(float)*D)
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