Apply psychoacoustic shelf filtering to a first order ambisonic signal (B-format).
The B-format signal, an array: [w, x, y, z]
Shelf filter corner frequency, in Hz.
High frequency scale for 0-order harmonic: W.
High frequency scale for 1st-order harmonics: X, Y, Z.
Output will be multiplied by this value.
This value will be added to the output.
FoaPsychoShelf is invoked by FoaDecode when a dual-band psychoacoustically optimised decoder1 is called by setting k to
'dual'. This kind of decoder is the optimum choice for small scale studio or domestic settings.
Please see this.