CF1, CF2:
The Common Loudspeaker File Format (CLF). The CLF was released announced
Apr 15 2005, From v8.0d CATT-Acoustic
supports the CLF format. For a background to the CLF,
and download of a free viewer with sample files, and a trial authoring version
go to the CLF web page: http://www.clfgroup.org.
four types
of native directivities:
SD2 based
on a general DLL Directivity Interface (DDI).
SD2 offers array modeling (very high resolution distance dependent directivity)
and can handle
extended near-fields. DDI lets a manufacturer offer high-resolution
data even before a new file-format is agreed on. It also offers data hiding
and hiding of intellectual property (e.g. for DSP-controlled arrays or other
special designs). For further details download a DDI
white paper in PDF-format and the 108th AES convention (Paris Feb 19-22,
2000) workshop presentation viewgraphs. The CATT DDI has been available
since 1998 but only during 2001 that competing software (even
those specialized in sound system design) are realizing that a similar interface
is required to handle arrays properly.
Current DDI-modules are:
CATT_Generic
for general not brand-specific array modeling: a module for
general
array modeling e.g. Duran Audio TARGET arrays with
FIR-filter weights (each transducer is described by its 3D location, SD0,
SD1, CF1 or CF2 directivity pattern, 3D aim, octave-band or FIR-filter
weights, delay, optional absolue calibrated). Here also the SD3 5º format with optional phase
information can be used.
distance-dependent
3D-balloon interpolation (can speed up full-blown array calculations with
10-100 times while retaining the nearfield handling at the expense of a 10º resolution, to be used for
faster initial aiming).
artifical
sector-based directivities to be used with anechoic sound recorded in sectors
surrounding e.g. a grand piano or a string quartet
CATT_Generic
has an open text-based interface but includes a way to save am encrypted
settingsfile to prevent altering.
for Duran Audio's AXYS
Intellivox series DSP-controlled columns arrays (including
all beam-steering options)
for L-Acoustics' V-DOSC
and dV-DOSC arrays (released 29-AUG- 2001, absolute calibration update
MAR-2004)
for Nexo Geo line arrays
(Geo
S released
27-JUN-2003. Geo T released MAR-2004, Geo D released
OCT-2006)(Req. at least v8.0b:2)
for Outline Butterfly line
arrays (released MAR-2004)(Req. at least v8.0b:2)
for ActiveAudio's StepArray DSP-controlled columns arrays
(including automatic and manual beam-steering options)
for PanBeam DSP-conrolled column arrays
(released 11-JUL-2007,
P32 and PB40 added 18-SEP-2007), requires v8.0g
for Renkus-Heinz Iconyx DSP-controlled column arrays.
for TannoyQFlex column arrays (released 19-AUG-2010)
SD1 based
on interpolation from measured 10º full space data. This
kind of data can be requested from most loudspeaker manufacturers (to a
high degree this will now be replaced by the CLF).
SD0 based
on interpolation from 15º horizontal and vertical polar
diagrams
SD3 5º full space data optionally
with phase (for array modeling via the DDI)
text import/export
of SD0/SD1, text export from SD2 to SD0 or SD1
graphical
editing of SD0/SD1 (no hard-to-understand spreadsheets)
collections
of directivities based on e.g. brand, type or favorites.
3D visuals
using CATT Marker files (or CLF fomat cabinet info)
optional
data locking to prevent accidental change of directivities
parameter
control of SD2 e.g. beam steering, beamwidth and focus (manufacturer/model
dependent)
3D-balloons,
sampled at:
SD0 at 7.5º, interpolation is performed
between measured points
SD1, CF1,
CF2 at 5º, interpolation is performed
between measured points
SD2 at 5º (2º optional) but at actual prediction
and run-time array modeling values for exact angles and distances are used
color shading
optional
polar graphs,
plot resolution:
SD0 at 15º (the measurement points)
SD1 at 10º (the measurement points)
SD2 at 2º so that narrow beams can
be well displayed (no angular limit at actual prediction)
Directivity Module 