4-8
Rev 2.2, 10/31/94
AGC Switch The AGC switch LED indicates that the
AGC/Leveler is active. When editing, the AGC
switch LED flashes, otherwise it reflects the state
of the AGC (in or out). There is no output gain
control; the 601 computes the correct amount of
makeup gain based on the ratio setting. Whenever
the AGC is currently being edited, the output
headroom LED display changes to read
gain-reduction.
The makeup gain may be set manually by pressing
the
RATIO switch until the display reads
gAIn
. Set
the makeup gain using the Wheel.
ATTACK Switch Modifies the attack time of the AGC/Leveler (peak
duration required to respond to a peak).
RELEASE Switch Modifies the release time constant of the AGC.
Remember that during no-signal periods, the AGC
causes the release time to be infinite (gain-
reduction release only occurs when there is no
valid signal).
RATIO Switch Adjusts the compression ratio of the AGC/Leveler
between 1:1 (out) and 4:1. The compression ratio is
the ratio of dB input change to dB output change.
The compressor's makup gain may be set manually
by pressing the
RATIO switch until the display
reads
gAIn
. Set the makeup gain using the Wheel.
THRESHOLD Switch Sets the auto-release threshold (edit buffer offset
61). This is the level that a valid input signal must
exceed to cause the AGC to readjust its gain to the
new input signal. To adjust the actual compressor
threshold (the compressor controlled by the auto-
release software), use the realtime editor (
SEt
procedure) as described in Section 7.3.12 and edit
parameter #56(dec).
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