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
: Global1
: Time series2
: Time-tagged time series3
: 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')