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  /cts/suite/audio_quality/test_description/processing/
check_spectrum_playback.py 36 # calculated freq spectrum in amplittude
54 spectrum = np.sqrt(abs(Phh[iLow:iHigh]))
55 spectrumMean = np.mean(spectrum)
56 spectrum = spectrum / spectrumMean
58 print "Normalized spectrum", spectrum
59 positiveMax = abs(max(spectrum))
60 negativeMin = abs(min(spectrum))
63 spectrumResult = np.zeros(len(spectrum), dtype=np.int16
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  /frameworks/av/media/libstagefright/codecs/aacenc/src/
psy_main.c 296 Word32 *Spectrum = psyData[ch].mdctSpectrum;
298 *Spectrum = (*Spectrum) >> scaleDiff;
299 Spectrum++;
479 Word32 normEnergyShift = (psyData->mdctScale + 1) << 1; /* in reference code, mdct spectrum must be multipied with 2, so +1 */
658 Word32 normEnergyShift = (psyData->mdctScale + 1) << 1; /* in reference code, mdct spectrum must be multipied with 2, so +1 */

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