Specifications

Processing Parameters
17
ProceSSIng ParameterS
The 'INPUT' menu contains options relating to the control and conditioning of the audio inputs.
'SOURCE' This parameter allows you to select the between the analog and digital inputs as the source for
the processing.
'ANALOGUE INPUT A/D CLIP LEVEL' This parameter is only active on units with a serial number of 500 or
greater. For serial numbers less that 500 see 'DSPXmini-HD Jumper Settings'. This parameter allows you
to set the analogue input level with reference to the DSPXmini-HD's A/D Converter. This would normally be
set to +24dBu if driving the DSPXmini-HD from professional audio equipment. When adjusting make sure
that the input audio meters NEVER show clipping under any conditions.
The 'PROCESS' menu allows access to all of the processing blocks that make up the DSPXmini-HD.
There are only sub-menus inside the 'PROCESS' menu. The submenus are laid out in the same configu-
ration as the signal path through the DSPXmini-HD.
The 'ENHANCE' menu contains the low frequency peaking bass equalizer which is used to provide bass
enhancement and help overcome the bass reduction effect of multi-band compression. Four frequencies,
amplitudes and Q's are provided giving you 64 different bass curves to select from. Frequencies selectable:
60Hz, 76Hz, 95Hz and 120Hz. Q's selectable: 0.4, 1, 2 and 4. Gains selectable: 0, 1.5dB, 3dB, 4.5dB, 6dB
The ‘MULTI-BAND AGC’ is designed to re-equalize the program material and create a consistent tonal bal-
ance while maintaining a consistent output level based on the RMS level of the program material.
‘B1-4’
‘DRIVE’ Controls the drive into the AGC. 0dB drive corresponds to a gain reduction of 0dB, the mid-
way point. The drive can be increased or decreased by up to 12dB. You may need to increase the
drive a little as you go up through the bands to compensate for the fact that music has less energy in
the higher frequency spectrum compared to low frequencies.
‘ATTACK’ Controls the attack rate of the AGC, The time the AGC takes to respond to an increase of
input level. The attack time can be varied between 1 and 10 which corresponds to 100mS to 10S on
a semi-exponential scale.
‘DECAY’ Controls the release/decay rate of the AGC, the time the AGC takes to respond to a
decrease of input level. The DECAY time can be varied between 1 and 10 which corresponds to
100mS to 30S on a semi-exponential scale.
‘GATE THRESHOLD’ The gate function prevents ‘suck-up’ of noise 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 gate can also be switched off or forced on. The gate when turned on will cause the gain reduc-
tion to move towards the resting 0dB level
The 'MULTI-BAND LIMITERS' peak limit each of the bands to prevent distortion in thefinal peak limiting con-
trol system.
‘MASTER LIMITER DRIVE’ Sets the drive into the multi-band limiter. This control allows a +/- 6dB adjust-
ment.
'B1-4'
'DRIVE' Controls the drive into the limiter. The drive can be increased or decreased by up to 12dB.
'PEAK 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 1mS to
200mS on a semi-exponential scale.
'PEAK 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 10mS to 1000mS on a semi-exponential scale.