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Symetrix 601 - Downward Expander Block

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4-6
Rev 2.2, 10/31/94
ATTACK Switch Sets the time required for the de-esser to engage.
This means that the input signal must remain
above the
THRESHold setting for a time that is
longer than the attack time. The
ATTACK time
ranges from 0.1ms (100 microseconds) to 10,000
ms (the display reads 9999, but the time is really
10,000 milliseconds or 10 seconds).
RELEASE Switch Sets the time required for the de-esser to recover
once the sibilant sound has ceased. The time
displayed is the time required for full decay in
response to a large, above-
THRESHold change in
the input signal. The
RELEASE time ranges from
100 ms (100 milliseconds) to 10,000 ms (the
display reads 9999, but the time is really 10,000
milliseconds or 10 seconds).
FREQ Switch Sets the transition frequency of the de-esser's
sidechain filter. The frequency can be varied from
31 Hz to 21,112 Hz. The default frequency is 5
kHz.
4.5.3 Downward Expander Block
The downward expander reduces its gain for any signal level below the THRESHold setting.
EXPANDER Switch Toggles the Expander between in and
out
. When
editing, the expander switch LED flashes,
otherwise it reflects the state of the expander (in or
out). When active, all of the dynamics parameter
modification switches are active. Whenever the
expander is currently being edited, the output LED
display changes to read gain-reduction.
ATTACK Switch Sets the time required for the expander to
terminate expansion. This means that the input
signal must remain above the
THRESHold setting
for a time that is longer than the attack time. The
ATTACK time ranges from 0.1ms (100
microseconds) to 10,000 ms (the display reads
9999, but the time is really 10,000 milliseconds or
10 seconds).
RELEASE Switch Sets the time required for the expander's gain to
decay once the input signal has fallen below
threshold. The time displayed is the time required
for full decay in response to a large, below-
THRESHold change in the input signal. The
RELEASE time ranges from 100 ms (100
milliseconds) to 10,000 ms (the display reads 9999,
but the time is really 10,000 milliseconds or 10
seconds).
RATIO Switch Sets the expansion gain RATIO (expansion ratio).
The range is from 1.0 (out) to 8 (ratio of 1:8, or 1
dB input change to 8 dB output change).

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