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equalizer: Reduce lag caused by averaging by giving less weight to older samples
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1 changed files with 3 additions and 1 deletions
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@ -100,6 +100,8 @@ def get_color(volume):
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l = ledbar.Ledbar(PIXELS)
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history = []
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history_diminish = np.array([[((i+1.0) / HISTORY_SIZE)**2] * CHUNK_SIZE for i in xrange(HISTORY_SIZE)])
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window = np.array([0.5*(1-math.cos(2*math.pi*i/(SAMPLE_SIZE-1))) for i in xrange(SAMPLE_SIZE)])
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work = True
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@ -119,7 +121,7 @@ try:
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history.append(indata)
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if len(history) > HISTORY_SIZE: history.pop(0)
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elif len(history) < HISTORY_SIZE: continue
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fft = np.fft.rfft(np.concatenate(history)*window)
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fft = np.fft.rfft(np.concatenate(history*history_diminish)*window)
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freq_limit = MIN_FREQ
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freq = 0
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i = 0
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