Skip to main content

spectrum​

spectrum(
    @size 2048
    @mode 0
) -> llll

Generates an audio descriptor to compute the magnitude spectrum of a buffer. The resulting magnitude spectrum has a size which is half the size of the input array plus one. Bins contain raw (linear) magnitude values.

The resulting buffer will be updated with the following keys:

  • spectrum
info

spectrum 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​

  • @size [int]: Frame size. (default: 2048).
  • @mode [int]: Analysis mode. (default: 0).
    • 0: Global
    • 1: Time series
    • 2: Time-tagged time series
    • 3: Buffer

Output​

Spectrum descriptor [llll]

Usage​

spectrum is meant to be used with the analyze function:

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