can;t remember where I saw about this, but check this link http://msp.ucsd.edu/techniques/v0.11/book-html/node141.html
see the quote "An easy and practical way to remove the zero-frequency component from an audio signal is to use a one-pole low-pass filter to extract it, and then subtract the result from the signal. The resulting transfer function is one minus the transfer function of the low-pass filter:" doesn't it agree with what I said? cheers 2014-04-22 14:37 GMT-03:00 Robert Esler <rob...@urbanstew.org>: > 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 > From: Alexandre Torres Porres <por...@gmail.com> > Subject: Re: [PD] WG: Inverse bandpass filter > To: Ingo <i...@miamiwave.com> > Cc: pd-list <pd-list@iem.at> > Message-ID: > <caeasfmhd0hanlmv9vutcsqzjkzy69i7wmebqq+20s2riwya...@mail.gmail.com> > 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 > > > 2014-04-18 17:21 GMT-03:00 Ingo <i...@miamiwave.com>: > > 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-boun...@iem.at > > [mailto:pd-list-boun...@iem.at<pd-list-boun...@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~]? > > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > >
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