spectrum()

audplot.spectrum(magnitude, hop_duration, centers, *, channel=0, cmap='magma', ax=None)[source]

Plot spectrum.

Parameters

  • magnitude (ndarray) – matrix with magnitude values

  • hop_duration (float) – hop duration in seconds

  • centers (ndarray) – array with center frequencies

  • channel (int) – channel index

  • cmap (str) – color map

  • ax (Optional[Axes]) – pre-existing axes for the plot. Otherwise, calls matplotlib.pyplot.gca() internally

Return type

AxesImage

Returns

Image object

Examples

>>> import librosa
>>> import matplotlib.pyplot as plt
>>> x, sr = librosa.load(librosa.ex("trumpet"))
>>> y = librosa.feature.melspectrogram(y=x, sr=sr, n_mels=40, fmax=4000)
>>> y_db = librosa.power_to_db(y, ref=np.max)
>>> hop_dur = 512 / sr  # default hop length is 512
>>> centers = librosa.mel_frequencies(n_mels=40, fmax=4000)
>>> image = spectrum(y_db, hop_dur, centers)
>>> cb = plt.colorbar(image, format="%+2.0f dB")
>>> cb.outline.set_visible(False)
>>> plt.tight_layout()
../_images/audplot-spectrum-2.svg