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 Forum index » DIY Hardware and Software
Cheap 8 stage all pass filter for diy modification
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Steveg



Joined: Apr 23, 2015
Posts: 165
Location: Perth, Australia

PostPosted: Sat May 15, 2021 3:40 am    Post subject: Cheap 8 stage all pass filter for diy modification Reply with quote  Mark this post and the followings unread

I was trying to find information on diode based all pass filters when I bumped into this: https://www.czh-labs.com/products/audio-all-pass-filter-phase-rotator-module-board-md-a110-audiowind-a-110
For US$20 it seems a reasonable price ... being through hole construction it should be easily modifiable to add variable phasing with vactrols or diodes.
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wakyct



Joined: Dec 30, 2020
Posts: 68
Location: USA
Audio files: 11

PostPosted: Sat May 15, 2021 8:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the link, I thought the background info on it was interesting as well.
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Steveg



Joined: Apr 23, 2015
Posts: 165
Location: Perth, Australia

PostPosted: Sat May 15, 2021 6:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

I thought the explanation was not very clear. I think he is trying to say that if you have transients in your signal (possibly due to interference) you can use the APF to smear the different frequency components of the transient to reduce its audibility. But then again he may be suggesting that the "leading phase" APF can be used to compensate for phase shifts caused by low pass filters. Or maybe both ... or maybe something else entirely.
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