CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

10.6 PROCESSING TOOLS BY EXAMPLE
CLIO has powerful processing tools that can be handful in several circumstances. We
saw the basics at the beginning of this chapter. It was just a brief description of the kind
"press this to do that". Here we are going to use some of them in practice. Some general
rules applies to group of them as the four basic operation. You can add, subtract,
multiply and divide the data in memory either wit a single complex value or with a
compatible file. Compatible means that it must be a file with the same basic settings
as the one in memory. Y-scale must also be the same that is you cannot add dBV with
Ohm. The use Load Process and Save Process, will become clearer along the examples.
The Add and Sub functions are most used among files. We will use them to obtain the
sum and difference of the woofer and tweeter of Fig.10.20. Results are in Fig.10.30
where the sum is in red and the difference in blue. This are useful plots to start with
during a cross-over design. Interesting enough is the big notch in the sum curve,
something not easy to imagine from the magnitude response.
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
20 100 1k Hz
10k 20k
Figure 10.30
The divide function, in its most classical use, allows to show a magnitude response as
transfer function with another measurement. Suppose you want to evaluate how the
grid affects the frequency response. We will use as reference the response of Fig.10.17,
which has been taken with the grid in place. We remove it, take another measurement,
and perform a division by file with the grid in place. We remove it, take another
measurement, and perform a division by file with the data of the reference. Result is
in Fig.10.31.
20.0
CLIO
180.0
dBRel
Deg
10.0 108.0
0.0 36.0
-10.0 -36.0
-20.0 -108.0
-30.0 -180.0
20 Hz
100 1k 10k 20k
Figure 10.31
Note that the y-scale has been automatically changed to dBRel. This is a good point to
introduce the use of Load and Save process together with the Automatic Processing
Chapter 10 - MLS 101