AFMG Network Forum

ScoobyWolf · Member

Hi all.

In my working group we have being discussing the correct way to do STI prediction in AURA.

Some of us say that to have accurate results I should use standard as input signal and then apply the correction values from EN60268-16 for male speech at the loudspeaker settings.
Others say that we must use Male for the input signal setting, and leave the LS settings "all to max" and then decrease some dB as necessary.

Can anyone help me clarify the correct way to do this.

Thanks

thomas · Member

Accurate results always require the consideration of noise and masking.
The resulting S/N in octaves are only valid, if the spectrum and the level of excitation and noise are.

So use e.g. human/man_loud without a PA (L(1m) = 67.0 dB/65.8 dB(A)).
With PA, use an appropriate speech spectrum (e.g. derived from man_loud and implemented as a filter for each loudspeaker). Adjust the level of each speaker so, that you get the wanted speech level in the auditorium.
Set an approptiate noise spectrum and level.

Setting of STI calculation ("Options" in "View")
There is unfortunately no explizit explanation of the meaning in the EASE Help, nor in the EASE manual.
I'm sure male/female toggles between the MTI octave band factors (see EN 60268-16, Appendix A 3.4).
And "Standard"? I can only guess. I suppose it uses old MTI octave band factors from the time before gender-specific actave band weightings and redundancy factors where introduced. But I'm not sure. Therefor I don't use it.
Make sure, that "Consider Noise Levels" and "Consider Masking" are checked.

T.