Biamp LTR - Manual (Page 26)

Audia-Manual-LTR
Frequency Band Setup is a dialog window that contains parameters for defining frequency
bands over which impedance monitoring should occur. Up to four bands can be defined. Active
Band
is used to choose which band’s parameters are displayed for modification. Center Freq
(Hz) is the center frequency of the active band. Bandwidth (Hz) is the bandwidth of the active
band. Tolerance % defines the amount above or below the baseline impedance curve that,
when exceeded, causes a High Impedance or Low Impedance Warning to occur. Setting
Tolerance % to a lower number means that a smaller change in the load impedance curve will be
sufficient to cause a High Impedance or Low Impedance Warning. Setting Tolerance % to a
higher number means that a larger change in the load impedance curve will be required to cause
a High Impedance or Low Impedance Warning.
Add Band is used to add an additional band to the monitoring algorithm. Up to four bands can
be defined. Remove Band will delete the highest-numbered band. Disable Alarms is used to
bypass the impedance monitoring algorithm and suppress any High Impedance or Low
Impedance faults that may be detected. Averaging length (samples) defines the number of
impedance measurements that are collected and averaged to determine the load impedance
curve. Setting this value to a lower number will allow the curve to be drawn and updated more
quickly, at the expense of some accuracy or “curve jitter.” Setting this value to a higher number
will cause the curve to be drawn and updated more slowly, but with smoother and more accurate
data.
Capture Alarm Baseline Data is used to populate the Alarm Baseline Data fields with the
currently displayed Realtime Impedance Data. The Realtime Impedance Data is obtained by
dynamically measuring load voltage versus current at several different frequencies throughout the
audible spectrum. The results of this impedance calculation are affected by the amplitude and
spectral characteristics of the signal passing through the amplifier module. For best results, a
wideband signal such as pink noise should be played at a sufficient level to overcome the noise
floor of the detection circuitry.
Impedance Monitoring Active is an indicator that illuminates when sufficient data has been
entered for the impedance monitoring algorithm to begin monitoring that band.
Auto Mixer Combiner
Note: The Auto Mixer Combiner replaces the Mix Minus Combiner in the software and incorporates all of its functionality,
plus some additional features. Files created in previous versions of Audia that contain a Mix Minus Combiner will still
function normally and the Mix Minus Combiner will still appear in the layout, even though the block will no longer appear in
the Object Toolbar or Processing Library. The user may substitute an Auto Mixer Combiner block anywhere a Mix Minus
Combiner would have been used.
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