VBrick 9000 Admin Manual page 79

Field
What is the Audio
Source
Audio Input Enable Use to Enable|Disable the selected Audio Input. At least one audio
Audio Input Name
Mute
Gain/Attenuation
Input Range
VBrick 9000 Encoder Admin Guide
Description
The audio mode can be configured to one of three possible settings:
• Stereo – Stereo directs the input left channel to the left channel in
the audio stream and the input right channel to the right channel
in the audio stream. In this mode, the encoder expects that the
two channels are not totally discrete and have audio components
that are common to both the left and right channels. In Stereo
mode, the encoder can compress the audio more efficiently and
achieve higher performance with lower bitrates. Always select
Stereo for DVD/VCR reproduction.
• Mono (left to stereo) – Mono directs the left input channel to
both the left and right channels.
• Dual – Each channel is compressed independently. Two totally
separated channels are compressed and decompressed. Dual is
ideal for voice applications where the microphone input from
two channels is separated to avoid crosstalk.
Note: There is performance benefit in bitrate efficiency when
operating in Stereo rather than Dual mode. However if the original
audio source has separate channels, you must use Dual.
input on the unit must be enabled. All audio inputs are enabled by
default.
Used to provide a meaningful name to the audio input source. The
default value of the field is useful to understand the physical
connection while renaming the field will convey what audio source
will be enabled.
Mutes the audio signal (but does not stop audio encoding). Silent
audio will be encoded and streamed.
Analog only. Controls the audio attenuation (or gain) applied to the
input signal of the encoder. Input levels can be gain-compensated to
adjust for mismatched input levels. Range: -96 to 10 dB in 1 dB
increments. Default = 0 dB.
Analog only. Controls the amplitude (voltage range) of the input
signal.
• Line Normal – Default. Use if the signal excursion will be above
0 dB.
• Line High Headroom – Use if the signal excursion will be at or
below 0 dB.
• Mic Boost 16 dB – Low preamplifier. Sets microphone
preamplifier to 16 dB. If not loud enough after performing a
sound check, set to 32 dB and check for distortion.
• Mic Boost 32 dB – High preamplifier. Sets microphone
preamplifier to 32 dB. If distorted after performing a sound
check, set to 16 dB and check sound quality.
Encoder Configuration
71