BW Broadcast DSPXtra-FM, Operational Manual

Page: 9 / 63

Meters
9
dSPX
tra
M
EtErS
The DSPXtra has several hundred 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 DSPXtra 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 DSPXtra. If we were to have used the same scale as the input meter-
ing 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 - Ariane leveller
The Ariane metering displays gain being applied with more leds indicating more gain, the metering having eight
columns, two columns for each band. The scale is -6 to +20dB in 2dB steps.
When the leveller is operating in matrix mode the left hand column of each band (1 through 4) represents the
Right plus Left component (aka the SUM signal) while the right hand column of each band represents the Left
minus Right component of the audio (aka the DIFFERENCE signal).
When the leveller is operating in stereo mode the left hand column of each band represents the left channel and
the right hand column represents the right channel.
When in bypass the metering returns to the 0dB gain position to indicate unity gain through the leveller
(bypassed).
There are two other leds above each gain column. One is the gate for the band and the other is the IDR for the
band. More information on the gate and IDR is contained in the processing setup section of this manual.
G/R metering - Six band limiter
The six band limiter displays gain reduction from 0dB to -24dB in 2dB steps.
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 DSPXtra to process two separate mono feeds.
The red LEDS above each gain reduction meter indicate HOLD when lit. More information on HOLD function is
contained in the processing setup section of this manual.
LOAD PRESET
REMOTE
AES/EBU
EDIT
UP
LOAD
SAVE
DSPXtra
OUTPUT
PROCESS
INPUT
UP
LOAD
U1=BASS FACE
INS
DEL
DONE
ENTER PASSCODE
INS
DEL
DONE
ENTER NEW PASSCODE
3 779
U2=ROUND FACE
U3=CLASSICAL 3
(A)
SAVE PRESET
UP
GO
U1=BASS FACE
U2=ROUND FACE
U3=CLASSICAL 3
(A)
INS
DEL
DONE
NAME PRESET U2
M Y PRESET 3
UP
LOAD
SAVE
DSPXtra
OUTPUT
PROCESS
INPUT
L IMITERS OUTPUT ARIANE LEVELER INPUT
DSPX tra
100
90
80
70
60
50
40
30
20
10
PILOT
0 0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
-33
-36
-39
-42
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-15
-18 -6
-4
-2
-0
+2
+4
+6
+8
+10
+12
+14
+16
+18
GATE CLIP GATE
+18
+16
+14
+12
+10
+8
+6
+4
+2
-0
-2
-4
-6
HOLD
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
HOLD
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
1 2 3 4 5 6
dB dB dB %
R L R L
MPX
+ / L - / R
ID R IDR
1 2 3 4
+ / L - / R + / L - / R + / L - / R
+20 +20
D S P X t r a - F M