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Figure 18. Control Blocks and Processor Chains
Audio level, Mix-point, processing Blocks, and Signal Chains
As outlined in red above, all control blocks on the main DSP control screen have one of
three main functions in the overall signal chain:
• Level control (gain/trim/volume),
• Mix-point (signal routing),
• Signal processing (filter/AEC/feedback/dynamics/delay/duck/loudness/automix).
The signal chain varies depending on whether it is in the input, output, virtual bus, or
EXP bus stage. Each of the three types of signal processing channels; Input (
a
/
b
/
c
),
Output(
e
/
f
/
g
), and Virtual (
h
) shown in figure 18 above, consist of a series of two basic
types of control blocks specific to that chain: level control (gain
a
/
c
, trim
e
, and volume
control
g
), and signal processors (frequency filters, feedback suppression, dynamics,
delay, ducking, AEC, AM, and loudness). Both types of control blocks are always present
in the chains. Gain controls default to unmuted and processor blocks are bypassed upon
insertion.
The EXP returns bus has only an AM processing block.
Gain, trim and volume blocks can be muted and processor blocks (after being inserted)
can be bypassed for signal comparison. Mutes and bypasses are shown by a red
indicator in the lower left of the block.
Figure 19. Input Gain Control Muted, Dynamics Processor (AGC) Bypassed
DMP128 • Software Control 28