Specifications

Processing Parameters
19
in 0.5dB steps.
'LIMITER ATTACK' Controls the attack rate of the limiter, the time the limiter takes to respond to an
increase of input level. The attack time can be varied between 1 and 10 which corresponds to 1 ms to
200 ms on a semi-exponential scale.
'LIMITER DECAY' Controls the peak release/decay rate of the limiter, the time the limiter takes to
respond to a decrease of input level. The DECAY time can be varied between 1 and 10 which corre-
sponds to 10 ms to 1000 ms on a semi-exponential scale.
'COMPRESSOR ATTACK' Controls the average attack rate of the limiter. This control is a modifier
control that scales from the peak attack control. The attack time can be varied between 1 and 10
which correspond to peak attack time / 2 to peak attack time / 1000 on a semi-exponential scale.
The AVG attack control determines the dynamics of the dual time constant system and how control is
shared between the peak and average circuits.
'COMPRESSOR DECAY' Controls the average release/decay rate of the limiter, the time the limiter
takes to respond to a decrease of input level. The DECAY time can be varied between 1 and 10
which corresponds to 200 ms to 5000 ms on a semi-exponential scale.
'HOLD THRESHOLD' The HOLD function prevents 'suck-up' of noise and helps reduce IM distortion
by allowing the limiter to rest during periods of silence or low level audio. The level can be adjusted to
turn on when the input drops to a level from -20dB to -40dB. The HOLD can also be switched off.
'DELAY' This function provides a delay before the peak decay circuit is activated. This can be used
to reduce distortion when faster release time constants are employed by reducing the gain hunting
between neighbouring transients. The range available is 1 ms - 500 ms on a semi-exponential scale.
'MIXER' menu. Each band can be adjusted over a small range to provide small EQ changes. These controls
are limited in range to prevent excessive drive into the peak clipping stages and excess distortion being
introduced. A solo mode is provided to aid in the setting up of parameters.
BAND 1 MIX: -3dB to +3dB of level adjustment is available.
BAND 2 MIX: -3dB to +3dB of level adjustment is available.
BAND 3 MIX: -3dB to +3dB of level adjustment is available.
BAND 4 MIX: -3dB to +3dB of level adjustment is available.
BAND 5 MIX: -3dB to +3dB of level adjustment is available.
BAND 6 MIX: -3dB to +3dB of level adjustment is available.
The 'LOOKAHEAD' menu contains the controls that affect the look-ahead limiter which serves as the peak
limiting method for the DR mode of operation.
'DRIVE' Controls the drive into the look-ahead limiter.
'SHELF EQ' A high frequency shelving filter with a variable cut response. Adjustable over a range of 0-17
which corresponds to a cut of 0dB to -17dB measured at 15 KHz. This low-pass shelving filter is used to
compensate for the effects of pre-emphasis when the DSPXtreme has pre-emphasis enabled (FM appli-
cations). The shelf control can also be used to tame high frequency energy when the box is configured
for DR applications and no pre-emphasis is enabled.
'LP FILTER' A high frequency filter adjustable over a range of 4-20 kHz. This control can be used to tame
the artifacts of subsequent perceptal coding, especially when used with very low bitrates.
'LOW ATTACK' Controls the average attack rate of the B1-2 look-ahead limiter. This defines the energy
distributed into the secondary time constant circuit. The attack time can be varied between 1 and 10
which corresponds to 10 ms to 2000 ms on a semi-exponential scale.
'LOW DECAY' Controls the average decay rate of the B1-2 look-ahead limiter. This defines the decay
rate of the secondary time constant circuit. The decay time can be varied between 1 and 10 which corre-
sponds to 10 ms to 2000 ms on a semi-exponential scale.