#38 Patch: add an "Invert" filter to reverse the polarity of the signal

[Etienne Dechamps]

I wrote a patch that introduces a new trivial filter, "Invert", which simply reverses the polarity of the signal, i.e. it multiplies the samples by -1. This can be useful in scenarios where one wants to introduce a 180° phase shift.

The patch can be found at https://github.com/dechamps/equalizerapo/compare/master...invert

[Jonas Dahlinger]

This was already possible using the Copy command, but it is of course not as obvious as just having an Invert command. Thank you for the contribution.

[Brendon Elliott]

Back to windows after 5 years. My amplifier inverts phase and I need to figure this out in order to invert it again so music will play in the correct phase. Could you explain how i can use this to achieve that?

[Jonas Dahlinger]

Example:

Copy: L=-1.0*L

[Josh]

It doesn't behave as intended on mine. Shouldn't it flip the filters if I entered a negative number on the copy command?

Channel: L
Filter: ON PK Fc 100 Hz Gain 5 dB Q 4
Filter: ON PK Fc 200 Hz Gain -5 dB Q 4
Copy: L=-1.2*L

[Peter Verbeek]

No, it doesn't flip the filter. It will be nice though. Btw. For a peak filter just dial the gain down to the negative. This is true for most filters with a gain setting.