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Funkcje Chroma i quiz dotyczący Chromagramów

Interpretuj zwijanie chrominancji, wykorzystanie chromatogramu, wybory transformacji, czułość strojenia i informacje muzyczne odrzucane przez łączenie oktaw.

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Pytanie 1 z 8

What does a standard twelve-bin chroma vector represent?

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  1. What does a standard twelve-bin chroma vector represent?
    • Twelve audio channels
    • Twelve Fourier bins spaced linearly by frequency
    • Pitch-class energy across twelve semitone classes
    • Twelve frequency-independent labels
  2. What information does octave folding discard?
    • All pitch-class identity
    • Register or octave placement
    • Audio timing
    • Every amplitude value
  3. Which transform may align naturally with semitone-spaced frequency bins?
    • A linear-frequency STFT grid with equal Hertz spacing
    • A cepstral grid representing spectral-envelope coefficients
    • A time-domain autocorrelation sequence indexed by lag
    • Constant-Q transform
  4. Why can tuning deviation blur chroma energy across bins?
    • Pitch frequencies shift relative to the assumed reference
    • Octave folding guarantees every tuning shift disappears
    • The reference changes only the frame timestamps
    • A fixed pitch-class grid always matches every detuned recording
  5. Which task benefits from comparing harmonic patterns across performances?
    • Measuring instrument timbre without spectral features
    • Detecting speech word boundaries
    • Comparing harmonic patterns across cover recordings
    • Estimating the duration of every individual note
  6. Why can chroma alone be insufficient for exact chord identification?
    • Chroma retains every note's octave and duration
    • Different chords may share pitch classes while differing in voicing or context
    • It contains no frequency information
    • It always classifies percussion as harmony
  7. What can frame normalization change in a chromagram?
    • Whether every recorded note has the same octave
    • Whether all instruments use equal tuning
    • Whether every frame is assigned a chord label
    • Whether values reflect relative pitch profile or absolute energy
  8. Which settings should be recorded for reproducible chroma features?
    • Transform, tuning, normalization and hop length
    • Only the analysis window length
    • Only the target class labels
    • Only the absolute tuning reference