Convolution Filtering

[yaslam]

(10-07-2020 08:39)Mr Underhill Wrote:  Hi,

On Saturday I measured my room using Dirac and so know where I am having a couple of issues, at 27Hz and 37Hz, the former needing reducing, the latter a gain.

I thought I would try using Convolution to address these and came up with this statement:

convOut= -lavfi "equalizer=f=27:width_type=q:width=8:g=-1.46,equalizer=f=37:width_type=q:width=8:g=2.04"

Which appears to be working OK .....BUT, the FFMPEG help file mentions several times:
'Beware of clipping when using a positive gain', which I am at 37Hz.

How do I check for clipping, or is there a way to apply gain without going into clipping?

Thx.

There is another suggestion that you can get the correct parameters for the equalizer and the convolution filter.
You can import the data measured by the microphone into the REW and acquire them accurately by automatically calculating the EQ of the REW.
*If you have a USB interface, you can directly import the data measured by the microphone into the REW.
https://www.roomeqwizard.com/
https://www.reddit.com/r/audiophile/wiki...correction

With REW, you can also get the parameters for the equalizer, but you can also export the filter as a WAV file.
See below for the syntax to convolution that WAV file.
https://minimstreamer.com/userguide.html...0filtering
https://forum.minimserver.com/showthread.php?tid=5109