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energyband​

energyband(
    @startcutofffrequency 0
    @stopcutofffrequency 100
    @samplerate 44100
    @mode 0
) -> llll

Generates an audio descriptor to compute energy in a given frequency band of a spectrum including both start and stop cutoff frequencies.

The resulting buffer will be updated with the following keys:

  • energyband
info

energyband is a mirror implementation of the same algorithm in the Essentia library. For more details on the algorithm, please check the Essentia Algorithms reference.

Arguments​

  • @startcutofffrequency [int]: Start frequency from which to sum the energy. (default: 0).
  • @stopcutofffrequency [int]: Stop frequency to which to sum the energy. (default: 100).
  • @samplerate [int]: Audio sampling rate. (default: 44100).
  • @mode [int]: Analysis mode. (default: 0).
    • 0: Global
    • 1: Time series
    • 2: Time-tagged time series
    • 3: Buffer

Output​

Energyband descriptor [llll]

Usage​

energyband is meant to be used with the analyze function:

$buffer = importaudio('singing.wav'); ## input buffer
$descr = energyband(); ## generate energyband audio descriptor
$buffer.view('before analysis');
$buffer = $buffer.analyze($descr); ## apply analysis
$buffer.view('after analysis')