Description

Filter the pvoc frames, passing bins whose frequency is within a band, and with linear interpolation for transitional bands.

Syntax

fsig pvsbandp fsigin, xlowcut,
      xlowfull, xhighfull, xhighcut[, ktype]

Performance

fsig -- output pv stream

fsigin -- input pv stream.

xlowcut, xlowfull, xhighfull, xhighcut -- define a trapezium shape for the band that is passed. 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 yield and exponential shape:

This includes a linear dB shape when ktype is log(10) or about 2.30.

The opcode performs a band-pass filter with a spectral envelope shaped like

Examples

asig  in                                 ; get the signal in

fsig  pvsanal   asig, 1024, 256, 1024, 1 ; analyse it
ftps  pvsbandp  fsig, 200, 400, 1000, 2000 ; filter 300-1500Hz
atps  pvsynth   ftps                     ; synthesise it
        

Credits