User`s manual

12.10 MEASURING FULL SPHERE LOUDSPEAKER POLAR DATA (3D
MODE)
Using one or two PC controlled turntables (Outline ET2503D or LinearX LT360)
under CLIO’s control and automation is it possible to easily collect sets of
loudspeaker (complete or partial) impulse responses balloons.
The 3D autosave mode is available with QC version software only.
The Autosave control panel allows for a simple setup of the measurement set, then
CLIO manage the whole process:
- send position commands to the turntables and monitor their status
- perform MLS measurements and save the results with the naming rules
12.10.1 PREPARING AUTOSAVE AND THE MLS CONTROL PANEL
We will use two PC controlled turntables (Outline ET250-3D) under CLIO’s control to
gather the full sphere balloon response of a loudspeaker.
The MLS measurement should be set in a particular way in order to automatically
acquire the responses at various polar and azimuth angles. To do this we will use
the turntable control and the autosave dialog.
Let's start with setting the autosave function (see also 5.3). Pressing Alt-F2 we
recall the Autosave Setting dialog (fig.12.23); here we choose the 3D mode and
input the desired file name ('RogersHalfChirp'), polar start (0), polar step (5), polar
stop (180), azimuth start (0), azimuth step (5) and azimuth stop (355).
Figure 12.23
The MLS menu is now ready to start taking measurements; we only need to
properly set the turntable and its control.
12.10.2 PREPARING THE TURNTABLES
We assume that the ET250-3D turntables are properly connected to your PC (refer
to 4.7 for details). To prepare for this measurement session you need to link the
turntables. At the beginning of the measurement session or by clicking the sync
button on the turntable CLIO will move the turntables to the 0,0 angle. Thus the
turntables must be set up to be in the 0,0 position with the loudspeaker on-axis
with the microphone.
174 12 WATERFALL , DIRECTIVITY & 3D