You could send the original signal in parallel and invert the phase by
multiplying with -1. You might have to delay the original signal in case
that the processed signal gets also delayed by one or more blocks.

Ingo

_______________________________________
> Von: pd-list-bounces@iem.at [mailto:pd-list-bounces@iem.at] Im Auftrag von
> AP Vague
> Gesendet: Freitag, 18. April 2014 18:49
> An: pd-list@iem.at
> Betreff: [PD] Inverse bandpass filter

>
> Is there a simple way to make [bp~] or [vcf~] have an inverse function? To
> filter out, rather than pass a changing frequency value. Is the easiest
> way to do this with a combination of [lop~] and [hip~]?

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