Vox -01 Operating Manual page 13

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 impulsive-
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 calculation
The VOX-01 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.
You can browse through all measurements saved earlier in the "browse measurements"
screen.
The following tips and pointers may be useful to remember when browsing STI measure-
ments with Quick STIPA and STIPA Pro:
• Measurements saved in Quick STIPA can be browsed in STIPA pro, and
vice versa. The measurement numbering range is shared between these
modules. This means that you can use STIPA pro to investigate measure-
ments done with Quick STIPA in more detail using the browsing screen in
STIPA pro.
• The settings you choose in STIPA pro (additive noise, level dependent
masking) affect the current measurement, but also affect which data is
shown in the measurement browser. This means that you can always enter
a noise spectrum and see how this affects measurements you did earlier
on. Similarly, you can go back later on and see what affect level dependent
masking has for a certain measurement.
• This implies that all data for each measurement is always saved - including
any data not actually shown during the measurement itself.
• Measurements can also be retrieved over USB; please refer to the section
"accessing saved measurements on a PC" for further instructions. For larger
numbers of measurements, processing of these saved data files (e.g. through
worksheet software) may be more efficient than inspection through the
measurement browser.
VOX-01 Operating Manual
13