Cobalt Digital Inc 3G Fusion 9921-FS, Руководство по эксплуатации продукта

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9921-FS-OM (V1.18) 9921-FS PRODUCT MANUAL
3-39
Operating Instructions
9921-FS Function Menu List and Descriptions
(continued)
• Auto Downmix (ADM) Provides an automatic downmix using alternate channels if designated
stereo pair lose signals. If content level drops below configurable threshold,
primary channel content is replaced with content downmixed from alternate
channels.
• Auto Downmix enables or disables auto downmixing for the four
downmixers.
• Downmix Threshold sets the threshold (in input dBFS) at which content
above the threshold maintains primary channel use.
• Primary to Downmix Holdoff sets the time allowed for below-threshold
primary content before downmix failover is engaged.
• Downmix to Primary Holdoff sets the time allowed, when primary is
noted to be above threshold, before primary content is again engaged for
use.
Note: • Default threshold and holdoff settings shown here are recommended
for typical use.
• For Failover indicator to properly function and for automatic
downmix to route to card processing, downmix output channels from
this function must be routed to a pair of card internal bus channels.
(For example, if primary channels Emb1/Emb2 were to be routed to
card internal bus channels Bus1/Bus 2, when using this function,
route Downmix A(L) and Downmix A(R) instead to Bus 1/Bus 2.)
Table 3-2 9921-FS Function Menu List — continued
•
•
•
Auto Downmix monitors designated
primary channels for up to four
downmixers (primary channels Lp
and Rp as Emb 1 and Emb 2 in the
example).
• If these channels maintain levels
above a selected threshold,
primary channels Lp and Rp pass
unaffected (as indicated by
Failover indicator showing
Primary).
• If these channels fall below a
selected threshold for a specified
selected period, downmixed
content replaces the primary
channels (as indicated by Failover
indicator showing Downmix).