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smoother. faster. the all new 2018 findthreshold method #19

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smoother. faster. the all new 2018 findthreshold method #19

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67b33aa
smoother. faster. the all new 2018 findthreshold method
Jul 13, 2018
b30e308
testing?
Jul 13, 2018
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3 changes: 3 additions & 0 deletions songmatch/addfingerprintstodatabase.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,4 +12,7 @@ def addfingerprintstodatabase (fingerprints):
printToSong[holderfingerprint[0]] = (1,holderfingerprint[1])






25 changes: 13 additions & 12 deletions songmatch/findthreshold.py
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Expand Up @@ -22,25 +22,26 @@
Outputs: cutoff_log_amplitude - Threshold value between foreground/background of spectrogram
"""





def findthreshold (specArray):
flattenedArray = specArray.flatten()
absArray = np.abs(flattenedArray)
loggedArray = np.log(absArray)
print(loggedArray.shape)
return np.percentile(loggedArray,90)

with open("/Users/caseygoldstein/Week1_Student/Day2/data/trumpet.txt", 'r') as R:
trumpet_audio = np.asarray([int(i) for i in R])

hist,bins = np.histogram(loggedArray,len(loggedArray)//2,density = True)
cumulative_distr = np.zeros(len(hist))
binsize = np.diff(bins)
cumulative_distr = (np.cumsum(hist*binsize))

print('hist:' + str(len(hist)))
bin_index_of_cutoff = np.searchsorted(cumulative_distr, 0.9)
cutoff_log_amplitude = bins[bin_index_of_cutoff]
return cutoff_log_amplitude

sampling_rate = 44100 # sampling rate in Hz

fig,ax = plt.subplots()
S, freqs, times, im = ax.specgram(trumpet_audio, NFFT=4096, Fs=sampling_rate,
window=mlab.window_hanning,
noverlap=4096 // 2)

print(newfindthreshold(S))