[LAD] Re: EQ Matching

On Sat, May 20, 2023 at 05:15:03PM +0200, Florian Paul Schmidt wrote: The minimum phase step is not really necessary, you could just use the linear phase version, the output of the IFFT rotated by half its size.

If you do the minphase operation, the best way to do this using an FFT that is at least 4 times as long as your IR. In other words, take the linear phase version in the time domain, add zeros, then do the minphase calculation.

This probably should not depend on the absolute values, just on the ratio, i.e. the calculated gain. If r = s2 / s1 you could impose a smooth maximum: g = r / sqrt (1 + M * r * r) with M in the range 1e-3 to 1e-2 Or you could even reduce the gain if r is really very high (which probably means there is nothing of value in s1 at that frequency: g = r / (1 + M * r * r * r) with M in range 1e-5 to 1e-4 Try this in gnuplot: plot [0:100] x / sqrt (1 + 1e-2 * x * x), x / sqrt (1 + 1e-3 * x * x) plot [0:100] x / (1 + 1e-4 * x * x * x), x / (1 + 1e-5 * x * x * x) to get an idea of what these will do.

Average levels in the two input files should be more or less matched, before applying any of these.