User`s manual

Table Of Contents
12.5.1 DIRECTIVITY SETTINGS AND OPERATION
Start Frequency
Selects the start frequency for the analysis.
Stop Frequency
Selects the stop frequency for the analysis.
Root File Name and browse button
The name of one file within the set to be displayed. By pressing the associated
button it is possible to browse the disk and choose the file.
Z-Start
Value associated to the first (rearmost) file.
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: <NAME><UNITS><VALUE/100>.MLS.
162 12 WATERFALL , DIRECTIVITY & 3D