SynthMaker

low pass filter misnomer

Archive · 2006 6 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

sambean ·

[pedantic] The filter in the toolbox with coefficient inputs is mislabled as a 'lowpass filter' It can actually be many forms of filter lowpass/highpass/allpass etc..

Should perhaps be called biquad filter.. [/pedantic]

Sam

malc ·

ok np, thanks 🙂

almpepe ·

Excuse me, but can you write an example file how to use the biquad filter to make an allpass filter? I don't know the asm+dsp code knowledge but I need to make an allpass filter. (and the inverse of it which produces a -90 degrees phase shift instead of 90 degrees)

Thank you!

almpepe ·

Ok, I succeeded in making an allpass filter, but it wasn't easy, and I don't think it's the best. Could someone include an optimized, better allpass-filter desing in SynthMaker?

MegaHurtz ·

in holland we cal it the cognitive property of maths.

MegaHurtz ·

Btw I think you allpass is quite well behaved. I like how the phase twists a bit.. very chebbychev like.

I dont think you can have a filter with a flat phase. (unless you delay the output). At the least it bends. This becouse you cant predict the future, only the past. So frequency`s affected by any filter will be affected in phase becouse it takes time to get to knowing there`s a frequency present. the time it takes is the wavelength of the frequency.

Wrote something here? To have a post removed or your name hidden, write to [email protected].

Before your first post

A few rules keep this a friendly place. You agree to them once.

Shown next to what you post, here and in the app. It doesn’t have to be your real name: 3–24 lower-case letters, digits or _ (capitals become lower case, spaces become _).

    Then your post goes up straight away.

    Delete this reply?

    Open it in SynthMaker?

    It goes on the track you’re editing there, in place of that track’s sound, and into My sounds. Your other tracks stay as they are.

    Want to keep that track’s sound? Start a new song in SynthMaker first (Song › New song), then open this.

    Report this reply?

    Only the developer reads reports. The person isn’t told who reported them.

    What’s wrong with it?

    Block this person?

    You won’t see their posts and replies here any more. They aren’t told, and you can unblock them at any time.

    People you’ve blocked

    Their posts and replies are hidden from you. Unblock someone to see them again.

    The community rules

    A few rules keep this a friendly place. Everyone agrees to them once, before their first post.