Metric Halo 3d Upgrade Board Set, Руководство пользователя

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13. DSP Implementation Guide
Signal Flow and Processing in the 3d Mixer
Every Input strip, Aux Bus, Group Bus and the Main Bus strip supports the insertion of latency-compensated
plug-in processing.
All Input strips may be routed to any or all Aux mix buses, Group buses and the Main bus strip.
• All plug-in processing within the 3d Mixer occurs in the shared DSP/FPGA engines of the Metric
Halo 3d hardware, completely independent of your Host computers‘ processor. The more 3d boxes
you connect to your MHLink domain, the more processing power you have.
• All plug-in processing is fully latency compensated within the 3d Mixer domain, following the basic
signal flow of: Insert strip -> Aux Bus strip -> Group strip -> Main Bus. Looping through multiple
Group buses (with processing) on the way to the Main Bus is also latency compensated.
+ + + + + +
Input Selection
+ + + + + +
Aux Mix Bus 1
Main Faders summing bus
Aux 1 Send Faders summing bus
Main
Bus Output
Summing buses and “Bus Assigns”
send to Group & Main buses.
Green signal flow is latency compensated
“Bus Outputs” send to audio
outputs (Host, USB, analog & digital).
Red signal flow *is not* latency-compensated
Main Mix Bus
Input Strips
Group Bus 1
Ch 1 Ch 2 Ch 3 Ch 4 Ch 5 Ch 6
…
…
…
Aux mix
Bus Output
Group
Bus Output
Group
Bus Assign
Aux mix
Bus Assign
Figure 13.1: Basic 3d Mixer signal flow
In practical terms, this means a signal coming through any Input strip direct to the Main bus will be
time-aligned with the same signal also routed through Aux bus mixer, then through Group buses,
and then to the Main bus, regardless of how much extra processing has occurred at each bus stage
(as shown in green, above).
Of course, any signal path that loops out to external devices via analog, digital or USB can not
be automatically latency compensated. This includes “I/O” inserts, and any signal which leaves the
mixer and returns via an Input strip (shown in red).