CLIOwin 7 PCI User's Manual - Audiomatica

speaker we are testing is a glorious Rogers LS3/5A, year 1978. Fig.10.14 shows our
result.
110.0
CLIO
180.0
dBSPL
Deg
100.0 108.0
90.0 36.0
80.0 -36.0
70.0 -108.0
60.0 -180.0
20 Hz
100 1k 10k 20k
Figure 10.14
What you see is the speaker plus the room where we took our measurement, which
is far from being anechoic. It is time to inspect the time domain. Clicking on the Time
Domain button we get Fig.10.15 and, Fig.10.16, once we zoomed to the first 11ms
and expanded the y scale.
p
p
0.50
V
CLIO
0.100
V
CLIO
0.40
0.080
0.30
0.060
0.20
0.040
0.100
0.020
0.00
0.00
-0.10
-0.020
-0.20
-0.040
-0.30
-0.060
-0.40
-0.080
-0.50
0.00 32 64 96 128 160 192 224 256 288 320
ms
-0.100
0.00 1.1 2.3 3.4 4.5 5.7 6.8 7.9 9.1 10 11
ms
Fil fi 10 l
Figure 10.15 and 10.16
CH A dBSPL U h d 51 2kH 16K R l
We also did another very important thing. At 7.3ms the first reflection due to the floor
can be seen, just as expected from Fig.10.11. We set the marker at 6.8ms, which is
just before the first reflection, and set the Stop Window there (see Chapter 8.5). By
doing this CLIO will set all values of the impulse response received after 6.8ms to 0 before
FFT is executed. In this way we simulate a reflection free environment. Clicking on the
Frequency Domain Button we obtain Fig.10.17.
110.0
CLIO
180.0
dBSPL
Deg
100.0 108.0
90.0 36.0
80.0 -36.0
70.0 -108.0
60.0 -180.0
20 Hz
100 1k 10k 20k
Figure 10.17
118 Chapter 10 - MLS