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librosa.clicks

librosa.clicks(times=None, frames=None, sr=22050, hop_length=512, click_freq=1000.0, click_duration=0.1, click=None, length=None)[source]

Construct a “click track”.

This returns a signal with the signal click sound placed at each specified time.

Parameters:

timesnp.ndarray or None: times to place clicks, in seconds
framesnp.ndarray or None: frame indices to place clicks
srnumber > 0: desired sampling rate of the output signal
hop_lengthint > 0: if positions are specified by frames, the number of samples between frames.
click_freqfloat > 0: frequency (in Hz) of the default click signal. Default is 1KHz.
click_durationfloat > 0: duration (in seconds) of the default click signal. Default is 100ms.
clicknp.ndarray or None: optional click signal sample to use instead of the default click.
lengthint > 0: desired number of samples in the output signal

Returns:

click_signalnp.ndarray: Synthesized click signal

Raises:

ParameterError

If neither times nor frames are provided.
If any of click_freq, click_duration, or length are out of range.

Examples

>>> # Sonify detected beat events
>>> y, sr = librosa.load(librosa.ex('choice'), duration=10)
>>> tempo, beats = librosa.beat.beat_track(y=y, sr=sr)
>>> y_beats = librosa.clicks(frames=beats, sr=sr)

>>> # Or generate a signal of the same length as y
>>> y_beats = librosa.clicks(frames=beats, sr=sr, length=len(y))

>>> # Or use timing instead of frame indices
>>> times = librosa.frames_to_time(beats, sr=sr)
>>> y_beat_times = librosa.clicks(times=times, sr=sr)

>>> # Or with a click frequency of 880Hz and a 500ms sample
>>> y_beat_times880 = librosa.clicks(times=times, sr=sr,
...                                  click_freq=880, click_duration=0.5)

Display click waveform next to the spectrogram

>>> import matplotlib.pyplot as plt
>>> fig, ax = plt.subplots(nrows=2, sharex=True)
>>> S = librosa.feature.melspectrogram(y=y, sr=sr)
>>> librosa.display.specshow(librosa.power_to_db(S, ref=np.max),
...                          x_axis='time', y_axis='mel', ax=ax[0])
>>> librosa.display.waveshow(y_beat_times, sr=sr, label='Beat clicks',
...                          ax=ax[1])
>>> ax[1].legend()
>>> ax[0].label_outer()
>>> ax[0].set_title(None)