Dear all,

I am finishing my project. Line In VU meter with microphone which is calibrated and measure dB in room. Now I want to add filter A-weight, to cut low noise frequencies.
I use Teensy 3.2 + Audio board. I want to use filters with Audio system design tool. But I don't know which to take.
I took function "setCoefficients(stage, array[5]);" but I cannot find some coefficients for A-weighting.
Does anyone know what is best way to implement A-weighting?

best regards,