Re: [sc-dev] HPF with 0 Hz

["Sean Costello" <seancostello2003@xxxxxxxxxxx>]

This seems like something that should be dealt with in documentation. The
filter's behaviour might be intuitive to DSP geeks, but may not be intuitive
to a musician who is trying to use the program, and knows nothing about the
underlying math. Plus, us DSP geeks like to read about that sort of stuff in
the documentation.

It seems fairly intuitive that a high pass filter with a cutoff of 0 Hz will
sound pretty much identical to a high pass filter with a cutoff that is
0.001 Hz away, so calling it "user error" seems a little harsh.

Sean Costello

----- Original Message ----- 
From: "James McCartney" <asynth@xxxxxx>
To: "SuperCollider developers list" <sc-dev@xxxxxxxxxxxxxxx>
Sent: Thursday, December 04, 2003 10:39 AM
Subject: Re: [sc-dev] HPF with 0 Hz


>
> On Dec 4, 2003, at 9:50 AM, Kasper Souren wrote:
>
> > Hi,
> >
> > When using the HPF UGen with a cutoff frequency of 0 Hz there is no
> > output at
> > all.
>
> the math blows up. the filter slope is 12 dB per octave and you are
> starting at octave minus infinity.
>
> > When using 0.001 nearly the entire signal is coming through.
>
> well what would you expect? it is a high pass filter after all..
>
>
> > Is this a
> > bug or a feature?
>
> This is user error.
>
> --
> james mccartney
> http://www.audiosynth.com
>
> _______________________________________________
> sc-dev mailing list
> sc-dev@xxxxxxxxxxxxxxx
> http://www.create.ucsb.edu/mailman/listinfo/sc-dev