Crown IQ-PIP-USP3, Справочное руководство

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page 21
Reference Manual
IQ-PIP-USP3/CN
Threshold: Sets the level, in dBu, above which the compressor begins to attenuate the
input signal. This level corresponds to the input level meter reading. The compressor is
“feed-forward,” meaning that the level detection point is located before the gain control
stage. The range is from +16 dBu to – 40 dBu.
Hysteresis: A “dead zone” that ensures a significant change before acting. The range is
from 0 to 12 dB.
Attack Time: Sets the attack time of the compressor. The attack time is defined as the time
it takes the compressor to attenuate the signal gain by 20 dB. The range is from 1 millisec-
ond to 0.1 second.
Release Time: Sets the release time of the compressor. The release time is defined as the
time it takes the compressor to increase the signal gain by 20 dB. The range is from
10 milliseconds to 10 seconds.
Hold Time: Sets the hold time of the compressor. The hold time is defined as the time
between when the input signal goes back below the threshold until the compressor starts to
release. The range is from 0 seconds to 10 seconds.
Compression Ratio: Sets the compression ratio of the compressor. The ratio is the rela-
tion between the amount of attenuation applied by the compressor verses the amount that
the input signal is over the threshold. The available settings are 2:1 to 32:1.
Beyond the three controls for each channel, a single-control Compressor Tie connects
the compressors together. The compressors are tied at their sense points, meaning that the
greater of the two input signals will be used as stimulus for both compressors. Each com-
pressor will still compress based on its individual threshold, attack, release and ratio set-
tings.
4.2.20 Filters
Each audio channel has four separate places where filters can be placed in the system.
There are 64 filters total within the USP3/CN and they can be placed anywhere within the
system. In addition to filtering, each possesses up to +/-24dB of gain. The following filters
are available:
• Lowpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 4
• Highpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 4
• Lowshelf:
• Highshelf:
• Lowpass EQ: Variable Q from 0.1 to 35
• Highpass EQ: Variable Q from 0.1 to 35
• Parametric EQ: Variable Q from 0.1 to 35
• All Pass: 1st and 2nd order