aud.flux

Specialisation of the general signal processing operator sig.flux focused on auditory modelling

Flowchart Interconnections

Same as in sig.flux.

Options

• aud.flux(…,'SubBand') decomposes first the input waveform using a 10-channel filterbank of octave-scaled second-order elliptical filters, with frequency cut of the first (low-pass) filter at 50 Hz:

sig.filterbank(…,'CutOff',[-Inf 50*2.^(0:1:8) Inf], 'Order', 2)

Alluri and Toiviainen (2010, 2012) introduced this model, using a frame size of 25 ms and half-overlapping, corresponding to the command:

aud.flux(…,'SubBand','FrameSize',.025)

The authors found that fluctuations in the lower channels, around 50 Hz ~ 200 Hz (sub-bands 2 and 3) represent perceived “Fullness”, and those around 1600 ~ 6400 Hz (sub-Bands 7 and 8) represent perceived “Activity”.

Alternatively, other filterbanks proposed in SigFilterbank can be specified, using the syntax:

• aud.flux(…,'SubBand','Gammatone')

• aud.flux(…,'SubBand','2Channels')

Accessible Output

Same as in sig.flux.