Anyone making a DC blocking filter?

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DJMaytag
Posts: 95
Joined: 17 Jun 2015
Location: Madison, WI

Post 13 Aug 2019

Ableton’s new CV Tools has a DC blocking tool, which would is useful for filtering out DC when using DC-coupled audio interfaces for bringing both audio and CV in from a modular synthesizer.

When using such an interface to input audio, there is sometimes a bit of DC offset that needs to be filtered out. Is anyone in here interested in creating such an RE?

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diminished
Posts: 915
Joined: 15 Dec 2018

Post 13 Aug 2019

Offset is 0 Hz, so an inaudible highpass filter will do the trick.

For clarification: inaudible = a steep highpass filter with a cutoff frequency below or at around 20 Hz

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selig
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Post 14 Aug 2019

The MClass EQ has a great DC blocking filter. While it's not adjustable (so doesn't work for more typical HP filtering in a mix), it's a great DC blocking filter because it doesn't affect the audible range but fully removes DC signals.

FIY, the Low Cut filter in the MClass EQ is down 3dB @ 23 Hz, and -1dB @ 28Hz, and looks to be around 12dB/Oct - so it pretty much leaves everything above 30-40 Hz alone. Meaning, it won't change your mix or affect your low end balance unless you add a lot of stuff around 20-30 Hz!
Selig Audio, LLC

DJMaytag
Posts: 95
Joined: 17 Jun 2015
Location: Madison, WI

Post 14 Aug 2019

selig wrote:
14 Aug 2019
The MClass EQ has a great DC blocking filter. While it's not adjustable (so doesn't work for more typical HP filtering in a mix), it's a great DC blocking filter because it doesn't affect the audible range but fully removes DC signals.

FIY, the Low Cut filter in the MClass EQ is down 3dB @ 23 Hz, and -1dB @ 28Hz, and looks to be around 12dB/Oct - so it pretty much leaves everything above 30-40 Hz alone. Meaning, it won't change your mix or affect your low end balance unless you add a lot of stuff around 20-30 Hz!
Awesome, will check those out! I probably have EQ's already that are good enough, if all I need to do is cut something super low, like 20 Hz or below. FabFilter Pro Q3 should handle that just fine, it seems.

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