pvsbandp pvsbandp pvsbandp A band pass filter working in the spectral domain. Filter the pvoc frames, passing bins whose frequency is within a band, and with linear interpolation for transitional bands. fsig pvsbandp fsigin, xlowcut, xlowfull, xhighfull, xhighcut[, ktype] 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: (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-pass filter with a spectral envelope shaped like klowfull __________________________ khighfull / \ / \ / \ / \ / \ ________/ \______________ klowcut khighcut 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 Author: &namejohn; December 2007