Octave Band Analyzer; Normalized Octave Band - Larson Davis SoundAdvisor 831C Reference Manual

4.3.3 Octave Band Analyzer

This feature
TAKE NOTE
requires the 831C-OB3 option.
FIGURE 4-4 Live Tab: 1/1 Octave Band Page
Each band is one
full octave that
increases from left
to right
Frequency weighting
and detector
Frequency band level

4.3.4 Normalized Octave Band

The normalized
TAKE NOTE
octave band pages are shown
because on a setup OBA page,
the Spectral Ln is turned ON
FIGURE 4-5 Live Tab: Normalized Octave Band Page
Highlight the bands
to change the
numerical values
accordingly by using
the right and left
arrow keys
5
Press to jump to
Ref, Set Reference,
and back to the
Octaves.
SoundAdvisor Model 831C
There are four pages that relate to octave bands. The bands on the 1/1
Octave pages represent the bandwidth of one full octave, and the
height of each band is amplitude of sound at that frequency. The 1/3
Octave band pages are similar, but each band represents a bandwidth
of 1/3 octave.
Similar to the regular octave band pages in display, the normalized
band pages are showing octave bands and the numerical values of the
highlighted band. However, the data is normalized using a selected
reference spectrum.
The reference spectra can be configured by navigating Tools Menu 
System Properties  Reference Spectra.
Live Displays
4 6
Use the and keys
to highlight the
desired band and the
numerical values
below will reflect the
information at that
octave
The purple band on
the far right
represents an
average sum of all
the bands
View References 1, 2, 3, 4,
A, -A, C, and -C
Save the current selected
values to use as a
reference by selecting
Set Reference.
4-4