2. The Constant-Q IIR Filterbank Approach to Spectral Flux
Risto Holopainen
Department of Musicology
University of Oslo

3. Flux by FFT measures degree of spectral change
efficient if window length = hop size

4. FFT Flux formula

5. Filterbank Flux Replace: FFT  biquad bandpass filters
Amplitude spectrum  RMS
Linear frequency spacing  logarithmic (octaves)
Hopping  sliding

6. Filterbank Flux

7. Frequency response

8. Impulse response Instead of adjacent windows:
decaying impulse responses

9. Effective IR length

10. Implementation
moving average RMS:
flux:

11. The sound of flux
original
flux

12. Sensory dissonance

13. A-DAFX
flux
sigmoid LP
Flux suppressor
original
processed

14. Feature extractor feedback systems
Dissertation 2012:
Self-organised sound with autonomous instruments:
Aesthetics and experiments

15. Feature extractor feedback systems
affine map
flux
nonlinear map