3025EMC Master Control Switching & Channel Branding
Page 60 Revision 3.0.3
4.6.1. Bus Defaults
Users set the defaults for each of the audio input types: Program, Preset, Emergency, VO1, VO2, VO3,
VO4 and VO5.
4.6.2. Audio Summing
This setting will perform an audio sum of the incoming audio channels. When set to Enabled, the audio
selected and its corresponding adjacent channel will be summed and applied to both channels. For
example, if enabled on A1, both A1 and A2 are summed and the result applied to both channels: A1 and
A2 as A1+A2.
4.6.3. Input Gain
The audio of each channel can have its input gain adjusted. This setting allows a relative dB value to be
selected to apply to the audio level incoming to the EMC audio mixer. For example, a value of -3dBr
means 3dB down from the level coming into the EMC. This gain stage allows the gain to be varied from
<120dBr to +12dBr.
4.6.4. Input Type
This parameter sets the incoming audio to either PCM or Data/Dolby. This is done on a channel per
channel basis. This option is only available on the PGM Bus. This option is normally used when Dolby-E
is required to “pass-through” the EMC’s audio mixer. Any channel pairs that are configured for
Data/Dolby will not transition with the rest of the channels; they will simply cut to avoid corruption of the
encoded data stream.
4.6.5. Ratio
Program, Preset, VO1, VO2, VO3, VO4 and VO5 each have an attenuation ratio setting. This is the ratio
of the audio that will be applied when a voiceover (or combination of voiceovers) is active.
Program: This is the ratio of program audio that will be mixed when a voiceover (or combination of
voiceovers) is applied. 100% means that 100% of the program audio will be mixed and
0% means that the program audio component of the audio mix will be silent. Only the
program channels that have been configured to “duck” will have the ratio applied to them.
See section 4.7 for more details on ducking.
Preset: This is the ratio of preset audio that will be mixed when a voiceover (or combination of
voiceovers) is applied. 100% means that 100% of the preset audio will be mixed and 0%
means that the preset audio component of the audio mix will be silent. Only the preset
channels that have been configured to “duck” will have the ratio applied to them. The
preset ratio will transition to program as part of a transition. See section 4.7 AUDIO
SHUFFLER for more details on ducking.
VO1: This is the ratio of VO1 audio that will be mixed when a voiceover (or combination of
voiceovers) is applied. 100% means that 100% of VO1 audio will be mixed and 0%
means that the VO1 audio component of the audio mix will be silent. Only the VO4
channels that have been configured to “mix” will have the ratio applied to them. See
section 4.7 for more details on mixing.
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