Processing Parameters
22
'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.
BAND1MIX:
-3dB to +3dB of level adjustment is available.
BAND2MIX:
-3dB to +3dB of level adjustment is available.
BAND3MIX:
-3dB to +3dB of level adjustment is available.
BAND4MIX:
-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'
A high frequency shelving filter with a variable cut response. Adjustable over a range of 0-17
which corresponds to a cut of 0 dB to -17dB measured at 15 kHz. This low-pass shelving filter is used
to compensate for the effects of pre-emphasis when the DSPX has pre-emphasis enabled (FM applica-
tions). 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.
'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 10mS to 2000mS 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 10mS to 2000mS on a semi-exponential scale.
'MID ATTACK'
Controls the average attack rate of the B3 look-ahead limiter. This defines the energy dis-
tributed into the secondary time constant circuit. The attack time can be varied between 1 and 10 which
corresponds to 10mS to 2000mS on a semi-exponential scale.
'MID DECAY'
Controls the average decay rate of the B3 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 corresponds
to 10mS to 2000mS on a semi-exponential scale.
'HIGH ATTACK'
Controls the average attack rate of the B4 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 10mS to 2000mS on a semi-exponential scale.
'HIGH DECAY'
Controls the average decay rate of the B4 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 10mS to 2000mS on a semi-exponential scale.
The
'CLIPPER'
menu contains the clipping controls that form the final peak limiting stages of the DSPX’s FM
mode of operation.
'MULTI-BAND CLIP DRIVE'
Controls the drive into the multi-band clippers that precede the main clipper.
Adjustable over a -6dB to +6dB range.
'BASS CLIP LEVEL'
Controls the clip level of the mix of Bands 1 and 2
.
The clip level range is -6dB to 0
dB referenced to the main clippers output level.
'BASS CLIP MODE'
Controls the action of the bass clipper. Hard provides maximum punch by using
the filtered harmonics of the clipped bass signal to create the illusion of more bass. Soft employs look-
ahead techniques to dynamically control the bass clip level. This creates a more natural soft clip action
which may be preferred for some formats. The soft clip option can raise the bass to 100% modulation as
opposed to the hard option which does not allow bass to exceed the bass clip threshold. The soft option
will add almost 5mS extra delay to the audio path.
'MID CLIP LEVEL'
Controls the clip level of band 3
.
The clip level range is -12dB to 0 dB referenced to
