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40 © 2009 VBrick Systems, Inc.
What is the Audio
Source
The audio output mode can be configured to 1 of 3 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.
Mute Mutes the audio signal (but does not stop audio encoding). Silent audio
will be encoded and streamed.
Gain/Attenuation This setting 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.
Input Range This setting controls the amplitude (voltage range) of the input signal.
• Line Normal – Default. Use if the signal excursion will be above
0dB.
• 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.