EQ from measurement-data

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Anton Hoyer
Anton Hoyer on 2 Dec 2021
Commented: Mathieu NOE on 9 Dec 2021
I have a set of data from a measurement [frequency, relative gain] stored in an excel-table. Now i want to use those values to build an EQ or otherwise somehow substract the values from mulitble audio-files.
Since the parametric EQ is limited to 10 bands and the graphic EQ has fixed frequency-bands, is there any chance doing this using the AudioToolbox?
Talking about a table of around 4000 frequencies with corresponding gain-values. Audio files are IRs of length under 1 second.
I'm thankful for any advice.

Accepted Answer

Mathieu NOE
Mathieu NOE on 2 Dec 2021
maybe you should share the data file (measurements) and code if you have already started one
once we have created the bank of filters we can use them to EQ the signal
for info, this code was for generating a bannk of 23 bandpass filters from 100 to 8,000 Hz center frequencies
%% INitializing Matlab Environment
close all;
b=log10(8000);%stop frequency and 100Hz is the pass frequency
grid on
ylabel('F (Hz)','FontSize',12);
set(gca,'YScale', 'log')
fs=44.1e3; %sampling frequency
hold on
for i= 1:1:23
BW = yc1(i)/5; % BW should be proportionnal to center frequencies (not fixed)
f_low = yc1(i) - BW/2;
f_high = yc1(i) + BW/2;
[B,A] = butter(1,[f_low, f_high]*2/fs,'bandpass');
freq = logspace(log10(f_low/4),log10(f_high*4),200);
hold off
set(gca,'XLim',[0 fs/2.56],'XTick',10.^(0:4),'YLim',[-12 0],'YTick',-12:2:0,'XScale', 'log')
Mathieu NOE
Mathieu NOE on 9 Dec 2021
Good news ! glad it worked out !

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