Meters And Status LEDs
9
dSPX M
ETERS
The DSPX has 182 LEDS that provide ‘always on’ instant IO and processing metering.
I/O metering
The input meters show the level of the input audio. The meters are ‘hooked in’ to the DSP code after the input
level selection and mode options. The clip LED’s represent the onset of the A/D convertors clip-point and these
LED’s should not light under any circumstances. Adjust the input gain control of the DSPX if they do.
The output meters represent the level in dB below full scale output. This output level is the peak output level of
the processing and has nothing to do with the actual output level set by the analogue and digital output level
options.
The output meters show a smaller dynamic range compared to the input ones. This reflects the smaller dynamic
range of the audio once processed by the DSPX. If we were to have used the same scale as the input metering
we would not see a lot of activity on the LED’s, with all of the LEDS on most of the time.
The multiplex output metering represents the composite outputs peak level. This is a representation of the out-
put in relation to the peak composite level of the processing and not the actual level set by the multiplex output
level control.
The IO meters follows an approximation of the PPM level of the audio waveform while a floating ‘peak hold’ dot
tracks the absolute value of the waveform
G/R metering
The gain reduction meters show the gain reduction and gating status of the main processing blocks. The range
shown is 0dB to -24dB in 2dB steps with the gating and hold LEDS indicating GATE or HOLD ‘active’ when lit.
There is only one meter per stereo channel and the value shown is the largest gain reduction of the left and right
channels. Under normal operation (with a stereo audio feed) this is fine but you may observe strange metering if
the channels are not very balanced in level or you are using the DSPX to process two seperate mono feeds.
S
TATUS
LEdS
The DSPX front panel contains three status LEDS.
REMOTE:
Indicates that the DSPX is currently talking to a remote computer. This will flash during
an update.
AES/EBU:
Indicates the presence of an AES/EBU signal connected to the digital audio input of the
DSPX.
EDIT:
Indicates that you are currently editing a parameter.
LOW
HIGH
MIDH
MIDL
LOW
HIGH
MIDH
MIDL
WB
L
R
L
R
MPX
CLIP
CLIP
CLIP
GATE
INPUT
AGC
OUTPUT
LIMITERS
REMOTE
AES/EBU
EDIT
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
-33
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
0
-1
-2
-3
-4
-5
-6
-9
-12
-15
-18
-21
110
100
90
80
70
60
50
40
30
20
10
PILOT
dB
dB
dB
dB
%
USB
DSP X
UP
LOAD
SAVE
DSPX
OUTPUT
PROCESS
HOLD
INPUT
LOW
HIGH
MIDH
MIDL
LOW
HIGH
MIDH
MIDL
WB
L
R
L
R
MPX
CLIP
CLIP
CLIP
GATE
INPUT
AGC
OUTPUT
LIMITERS
REMOTE
AES/EBU
EDIT
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
-33
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
0
-1
-2
-3
-4
-5
-6
-9
-12
-15
-18
-21
110
100
90
80
70
60
50
40
30
20
10
PILOT
dB
dB
dB
dB
%
USB
DSP X
UP
LOAD
SAVE
DSPX
OUTPUT
PROCESS
HOLD
INPUT
