pvsbandr — A band reject filter working in the spectral domain.
Filter the pvoc frames, rejecting bins whose frequency is within a band, and with linear interpolation for transitional bands.
fsig -- output pv stream
fsigin -- input pv stream.
xlowcut, xlowfull, xhighfull, xhighcut -- define a trapezium shape for the band that is rejected. The a-rate versions only apply to the sliding case.
ktype -- specifies the shape of the transitional band. If at the default value of zero the shape is as below, with linear transition in amplitude. Other values give an exponential curve
(1 - exp( r*type )) / (1 - exp(type))
This includes a linear dB shape when ktype is log(10) or about 2.30.
The opcode performs a band-reject filter with a spectral envelope shaped like
klowcut khighcut
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klowfull\__________________________/ khighfull