INTERACT FORUM

More => Old Versions => JRiver Media Center 29 for Windows => Topic started by: Falconer72 on February 02, 2022, 05:41:24 am

Title: Feature request - allpass filter
Post by: Falconer72 on February 02, 2022, 05:41:24 am

Hi! Can you add the allpass filter to the equalizer filters? I can't use the external DSP without it. I can handle everything else within the DSP Studio but this feature is really missing.
Thank you.

Title: Re: Feature request - allpass filter
Post by: JimH on February 02, 2022, 06:29:08 am

Could you explain why you need it?

Title: Re: Feature request - allpass filter
Post by: mattkhan on February 02, 2022, 07:21:25 am

It's a longstanding request, e.g. https://yabb.jriver.com/interact/index.php/topic,99096.msg685880.html#msg685880

Can be useful in a variety of circumstances, integrating multiple subwoofers is one such case.

Title: Re: Feature request - allpass filter
Post by: Falconer72 on February 02, 2022, 08:44:37 am

Helps in phase alignment when making a 3-way active crossover.

Title: Re: Feature request - allpass filter
Post by: Matt on February 02, 2022, 08:45:39 am

The all pass filters I've found all take a focus frequency.  Does that seem expected to you all?

Title: Re: Feature request - allpass filter
Post by: mattkhan on February 02, 2022, 09:14:07 am

You can see a typical biquad APF in https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html

Title: Re: Feature request - allpass filter
Post by: Matt on February 02, 2022, 09:17:58 am

Yup, and that implementation uses "center frequency" as well.  I coded an all pass a few years ago and left it commented out.  I'll try to bring it back to life.

Title: Re: Feature request - allpass filter
Post by: carlismysecondname on February 18, 2022, 08:42:56 am

I've been wondering where the all-pass filter was in DSP studio... it really should be there.


All-Pass Filters in the Real World
https://www.youtube.com/watch?v=_KAa39OcMoo

Having it can really come in handy.