Calculates the spectral flux. More...
#include <SpectralFlux.h>
Protected Attributes | |
| bool | l2norm |
Detailed Description
Calculates the spectral flux.
Outputs
- Spectral flux
- The spectral difference between successive frames.
Parameters
- Use L2 norm
- Whether to use L2 normalisation over L1 (default = 0)
Description
The algorithm is defined in [1], section 2.1: "Spectral flux measures the change in magnitude in each frequency bin. It is restricted to the positive changes and summed across all frequency bins."
When using L1 norm, the algorithm is as follows:
\[ SF(n) = \sum_{k=0}^{F_s/2} H\left( | X(n,k)| - |X(n-1,k)| \right) \]
When L2 norm is selected, the following is used:
\[ SF(n) = \sqrt{ \sum_{k=0}^{F_s/2} H\left( | X(n,k)| - |X(n-1,k)| \right)^2 } \]
In both cases, \( H(x) = \frac{x+|x|}{2} \)
[1] Dixon, S. (2006). Onset Detection Revisited. International Conference on Digital Audio Effects (DAFx) (pp. 133–137).
Member Data Documentation
◆ l2norm
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protected |
Flag to indicate use of L2 normalisation
The documentation for this class was generated from the following file:
