Bedrock AM100, Руководство по эксплуатации

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28 Bedrock AM100 operating manual © Bedrock Audio BV, 2021
There are two ways to include the influence of background noise in your STI measure-
ment:
• Simply do your measurement in the actual noise environment. The STI
method is designed to incorporate the effects of any noise present during
the measurement representatively in the measured STI. This approach
works well if the noise field is stable and free from fluctuating and impul-
sive components.
• If you have the option to physically “turn the noise off,” then it is often
more accurate to add the noise computationally in a so-called post-hoc cal-
culation. The SM50 does this for you, if you enter the noise spectrum in
the “additive noise” screen and change the setting to “Noise included in
displayed STI.”
If you wish to add noise computationally, the screen “additive noise” should be used to en-
ter the noise spectrum. Note that the noise spectrum that you enter is only used if you also
select the corresponding option in the settings menu: entering the spectrum is not enough,
you also need to turn the additive noise feature on via the settings screen.
Additive noise screen
A few remarks about adding noise computationally:
• If you add noise computationally, all displayed STI values will be affected
until you turn the additive noise feature off again. The main display field
will now show the STI
including the effect of noise.
• At the same time, the noise-free STI (as directly measured) is shown beside
the indication “no noise:”
• Whenever additive noise feature is enabled, the label “N!” is shown next to
the main STI display field. This is just a reminder that the displayed value
includes the effects of (computationally added) noise.