User`s manual

10.6 PROCESSING TOOLS BY EXAMPLE
CLIO has powerful processing tools that can be helpful 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 apply to a group of them for four basic operations. You can add,
subtract, multiply and divide the data in memory either with 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 of Load Process and Save Process, will become
clearer as we review the examples. The Add and Sub functions are used mostly
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. These are useful plots to start with during a cross-over design.
For example it is interesting to consider the big notch in the sum curve, something
not easy to imagine from the magnitude response.
Audiomatica Srl MLS - Frequency Response 10/07/2001 18.48.53
CH A dBSPL Unsmoothed 51.2kHz 16 K Rectangular File: tweeteralone.mls
100 1k 10k 20k20 Hz
110.0
dBSPL
180.0
Deg
100.0 108.0
90.0 36.0
80.0 -36.0
70.0 -108.0
60.0 -180.0
CL IO
Figure 10.30
The divide function, in its most classical use, allows the user to show a magnitude
response as a transfer function with another measurement. Suppose you want to
evaluate how the grid affects the frequency response. We will use the response of
Fig.10.17 as a reference, 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.
Audiomatica Srl MLS - Frequency Response 07/07/2001 10.15.18
CH A dBSPL Unsmoothed 51.2kHz 16K Rectangular File: grid.mls
100 1k 10k 20k20 Hz
20.0
dBRel
180.0
Deg
10.0 108.0
0.0 36.0
-10.0 -36.0
-20.0 -108.0
-30.0 -180.0
CL IO
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 button. Any process you execute can be saved to disk and will have
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