CLIOwin 7 PCI User's Manual - Audiomatica

Z-Stop
Value associated to the last (foremost) file.
Z-Ref
Value associated to the file to be taken as reference.
The radiation characteristics of a loudspeaker or driver versus frequency and angle rely
on a huge amount of data i.e. a set of frequency responses (taken at different angles
on the vertical or horizontal planes) saved to disk; for example it is common to work
with sets of 72 files representing the frequency response taken at 5 degrees angles to
represent a complete rotation in a plane.
With the directivity analysis you get a powerful way for synthesizing a large number of
measurements in a single color map or 3-D graph. This control panel allows the
representation of the classical polar response of a loudspeaker as in Fig. 12.10.
In order to identify the set of files it is important that all of their names follow a particular
syntax, that gives certain information to the processing routines.
The syntax follows: .MLS.
NAME is a common file name, UNITS are the common measurement units (to be
displayed in the graph as Z axis label) and VALUE is a unique value identifying the single
file; these quantities needs to be separated by spaces, it is possible to give negative
numbers to VALUE. For example 'mydriver deg -250.mls' is a valid file name: as the
name tells it is a measurement named mydriver with units deg taken at -2.5 (250
divided by 100) units value. If the units are not specified within the name then the
processing defaults to deg.
The autosaving and naming capabilities of CLIOwin render the job of measuring and
creating a complete directivity data set an easy and automatic task (see later 12.6 for
an example).
It is possible to identify one file within the set as the reference with the Z-ref value; when
in reference mode all calculations will then be done referenced to it.
Chapter 12 - Waterfall and Directivity 151