VBrick 9000 Series, Admin Manual

Page: 80 / 192

72 © 2015 VBrick Systems, Inc.
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Audio Page Topics:
Audio Rate Settings
Clone Audio Input
Automatic Volume
Control Analog only. The volume is continually monitored and automatically
adjusted to normalize audio levels as follows. Default = Standard.
• Standard – Default. Use for general content which may already be
companded (compressed and expanded).
• Light – Peak limiting. Best dynamic range.
• Moderate – Peak limiting with expansion. Reduced dynamic
range.
• Aggressive – strong normalization, low dynamic range, most
noticeable.
• User-Defined – Advanced users only. User Defined values employ
two thresholds (high level limit and low level boost) which define
db threshold levels to which volume changes are applied. The low
level boost threshold defines the threshold whereby lower signals
lower will be amplified by gain. The gain is applied gradually until
the audio level is higher than the configured threshold. The high
level limit threshold defines the threshold whereby signals higher
than this value will be attenuated until the audio level is reduced
to a lower value than the threshold.
Attack Rate – determines how quickly the volume is increased or
decreased once a level threshold is crossed.
Release Rate – determines how quickly the encoder volume levels
are relaxed to the normal position.
Maximum Level – the maximum (attenuated) audio level you wish
to achieve after reaching the threshold.
Minimum Level – the minimum (boosted) audio level you wish to
achieve after reaching the threshold.
Noise Gate Analog only. Used to suppress unwanted audio noises that are
continuous and predictable (for example air conditioning equipment
or traffic sounds). A a noise gate allows a signal to pass through only
when it is above a certain threshold. If the signal falls below the
threshold no signal is allowed to pass.
Note: The noise gate is particularly useful in AVC (automatic volume
control) configurations to keep ambient, low-level noise from
propagating with gain (i.e. being amplified).
Noise Gate Level Displayed only if Noise Gate is enabled. Range: -34 to -82 dB.
Field Description