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Samples on natural directivity patterns (TLKNORM, TLKRAISE and Soprano ref. 42)
The TLKNORM source type corresponds to a male talker with a normal vocal effort. The gain and
EQ fields in the Point source editor (inside ODEON) should be set to zero. This source is also a
reasonable approximation to a female talker, except that the 63 and 125 Hz band should be
ignored.
To simulate a trained talker addressing an audience in a raised voice, use the TLKRAISE source.
This has the same directivity as TLKNORM, but the levels in the eight octave bands are
respectively 2, 2, 5, 7, 9, 8, 6 and 6 dB higher. The directivity pattern of Soprano ref. 42 is the
directivity of a soprano singing opera (Parati & Otondo, 2003).
10.3 Common loudspeaker format, CF1 and CF2 files
ODEON 8 and later supports the Common Loudspeaker Format which
is an open format for loudspeaker data, supported by several
loudspeaker manufacturers as well as manufactures of software
programs such as ODEON. The Common Loudspeaker Format was
developed and is maintained by the CLF-group at www.clfgroup.org.
It is an open, though secure, file format for loudspeaker performance
data and polar plots. Loudspeaker manufacturers can use the CLF
format to supply data to end users of professional acoustic computer programs.
CLF is defined in two parts, a binary format for data distribution and a text-based format used
solely by the loudspeaker manufactures for data input and editing. As a user of ODEON you
should deal only with the binary distribution files having the extensions CF1 and CF2. In order to
view all data in the CLF format you should download a free viewer from the CLF home page.
CF1 has a frequency resolution of 10 degrees, 1/1 octave and CF2 has a frequency resolution of
5 degrees, 1/3 octave. If data are available in either format for a selected loudspeaker then
the CF2 format should be preferred because of its angular resolution. Currently ODEON does
not make use of the higher frequency resolution of the CF2 format, however in the future
ODEON will make use of this extra information for calculation of the distance dependent
directivity of loudspeaker arrays (which are composed from multiple units which are added
with phase)
The CLF Group is providing a set of free tools for data editing, conversion from text to binary
format and viewing binary data allowing loudspeaker manufacturers to create, view and verify
binary distribution files for use in ODEON. This ensures that it is easy for loudspeaker
manufactures to make these data available. Links to loudspeaker manufacturers currently
providing binary distribution files can be found at the download page at www.clfgroup.org. If
apparently the data of interest is not available from the manufacturer of interest, then assist
the Clf-group by encouraging the manufacturer to make such data available – free tools for
this purpose can also be obtained at the CLF group’s homepage.
File location for directivity files
No matter if files are in the CF1, CF2 or in ODEON’s native So8 format, the files should be
stored in ODEON directivity directory which is specified inside ODEON at Options|Program
setup|Directivity files location. The files may be stored in subdirectories to this directory allowing
loudspeaker directivities of different brands to be located in separate directories e.g.
C:\ODEON\DirFile\ManufacturerA or C:\ODEON\DirFile\ManufacturerB. We have taken the opportunity to create a
number of folders for manufactures which do supply loudspeaker directivity files in the CLF
format. Using these predefined directories, it is easier to move a room from one PC to another
without breaking file linkage.
10.4 Creating new directivity patterns in the ODEON .So8 format
Tools for creating directivity patterns in the ODEON .So8 format can be found at the Tools|Creating
directivity patterns menu entry inside the ODEON program. The tools allow you to expand the set of
source directivity pattern files available for point sources in ODEON. The ODEON directivity
pattern file (Version 3 or later) contains information on the sound levels for the eight
frequency bands 63 Hz to 8 kHz in dB for each 10° azimuth and 10° elevation. These files are
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