I could be wrong, but I don't think it's quite the same thing. I believe the signal would be out of phase negating many of the effects of the filter. I would recommend using [biquad~] and in pd-extended there is a [notch] object which takes care of the coefficients. This sounds much cleaner and more notch-like to my ear than subtracting the filtered output.
There is an explanation in Miller's book if you like unit circle math: http://msp.ucsd.edu/techniques/latest/book-html/node144.html
-----------
Message: 4
Date: Tue, 22 Apr 2014 01:59:07 -0300
Subject: Re: [PD] WG: Inverse bandpass filter
Message-ID:
Content-Type: text/plain; charset="utf-8"
isn't it just subtract the audio from the filtered output?
I guess you can get inverse freq response just by that
cheers
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
> AP Vague
> Gesendet: Freitag, 18. April 2014 18:49
> 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~]?
_______________________________________________
UNSUBSCRIBE and account-management ->