Void Bias V3 User Manual - page 23
9.10 DSP Settings: Common settings
The DSP is an advanced digital sound processor board based
on a floating point SHARC® DSP.
DSP can be used to optimise the performance of the audio
system by means of fully customizable crossovers and equaliz-
ers. Exceptionally high reliability is guaranteed in all conditions
by advanced limiters, and continuously monitored loudspeaker
parameters. This chapter illustrates the features and opera-
tional modes of the DSP board.
9.10.1 Source selection
This menu allows to choose the input signal to be processed
by the DSP. The possible options are:
•
Stereo: the signal coming from channel 1 is processed
and routed out to output channel 1. Similarly, the input
signal coming from Channel 2 is processed and then
routed out to output channel 2.
•
Parallel from CH1: the input signal from channel 1 feeds two
parallel, distinct and independent processing branches.
The result of one branch is sent to output channel 1, while
the result of the other branch is sent to output channel 2.
•
Parallel from CH2: the input signal from channel 2
feeds two parallel, distinct and independent processing
branches. The result of one branch is sent to output
channel 1, while the result of the other branch is sent to
output channel 2.
•
Mono Mix: the input signals from channel 1 and 2 are
summed together and routed to both output channels in
order to maintain a consistent output level.
9.10.2 AES3
This menu controls the AES3 input stream options. The AES3
source can enter the amplifier from the rear XLR connector or
from the AESOP board (if present) based on the type of input
selection (ref. Chapter 9 : 3.Amplifier settings: Input select).
9.10.2.1 Gain trim (dB)
This menu allows the user to set the gain to be applied to
the signal coming from the AES3 digital input. Setting a 0 dB
gain makes the full-scale digital signal equivalent to a 20 dBu
analog input signal.
9.10.2.2 If no link
This menu controls the amplifier’s behaviour should the AES3
signal connection fail or become unreliable. The AES3 con-
nection is considered unreliable when transmission errors are
greater than 1% of total data transmitted. The possible options
are:
•
Mute: when the AES3 connection fails, the amplifier mutes
the output.
•
Analog: when the AES3 connection fails, the amplifier will rely
on the analog input as backup. This source signal switching is
done in real time in order to avoid any glitches in the audio feed.
If the input levels are correctly matched between analog input
and AES3 input (use the AES3 Gain trim parameter), the switch
between AES3 and analog will be inaudible.
When using the analog input to backup a failed AES3 feed, the analog
input connection must be setup based on source type of input AES3
stream:
•
AES3 from rear XLR – the primary audio signal for this configura-
tion is an AES3 fed via the rear XLR (AES3 DSP Out ref.
Chapter 7 : 4.Digital Input). The backup analog cable, with an
analog signal identical to that provided by AES3, should be
plugged in the channel 1 XLR input. If the AES3 feed should fail,
the amplifier will automatically fall back to channel 1 analog input
(we suggest to set the DSP source selection to “Parallel from
CH1”). The signal levels of both primary AES3 and backup analog
signals should be carefully matched. This can be done using the
gain trim parameter or by adjusting the analog signal level.
•
AES3 from ASEOP – the primary audio signal for this configu-
ration is an AES3 fed via the RJ45 port (AESOP DSP Out
ref. Chapter 7 : 4.Digital Input). The backup analog cable, with an
analog signal identical to that provided by the AESOP, should
be plugged in the channel 1 XLR and channe 2 XLR (set to
analog) connectors. The DSP’s source selection can be set to
any possible input. If the AESOP feed should fail, the amplifier will
automatically fall back to the analog input on the channels 1 and
2. The signal levels of both primary AESOP and backup analog
signals should be carefully matched. This can be done using the
gain trim parameter or by adjusting the analog signal level.
When the AES3 stream is lost and the analog backup kicks in, a
message on the front panel is displayed and if a remote client (e.g.
Armonía) is connected to the amplifier, an alarm is sent to it.
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
IN2
(analog)
carrying the same signal as the CH2 of the AES3 feed
carrying the same signal as the CH1 of the AES3 feed
IN1
(analog)
CH1 out
CH2 out
Analog back up cabling
Analog back up cabling
Main digital AES3 stream via RJ-45
CH1
CH2
Analog back up cabling
carrying the same signal as the CH1 of the AES3 feed
Digital main cabling
IN1
(analog)
IN2
(AES/EBU)
CH1
CH2
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
CH1 out
CH2 out
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
IN2
(analog)
carrying the same signal as the CH2 of the AES3 feed
carrying the same signal as the CH1 of the AES3 feed
IN1
(analog)
CH1 out
CH2 out
Analog back up cabling
Analog back up cabling
Main digital AES3 stream via RJ-45
CH1
CH2
Analog back up cabling
carrying the same signal as the CH1 of the AES3 feed
Digital main cabling
IN1
(analog)
IN2
(AES/EBU)
CH1
CH2
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
CH1 out
CH2 out
FIGURE 25: AES3 from XLR.
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
IN2
(analog)
carrying the same signal as the CH2 of the AES3 feed
carrying the same signal as the CH1 of the AES3 feed
IN1
(analog)
CH1 out
CH2 out
Analog back up cabling
Analog back up cabling
Main digital AES3 stream via RJ-45
CH1
CH2
Analog back up cabling
carrying the same signal as the CH1 of the AES3 feed
Digital main cabling
IN1
(analog)
IN2
(AES/EBU)
CH1
CH2
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
CH1 out
CH2 out
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
IN2
(analog)
carrying the same signal as the CH2 of the AES3 feed
carrying the same signal as the CH1 of the AES3 feed
IN1
(analog)
CH1 out
CH2 out
Analog back up cabling
Analog back up cabling
Main digital AES3 stream via RJ-45
CH1
CH2
Analog back up cabling
carrying the same signal as the CH1 of the AES3 feed
Digital main cabling
IN1
(analog)
IN2
(AES/EBU)
CH1
CH2
DSP Source Selection mode: Parallel from CH1
main digital connection
analog backup connection
(used if digital fails)
CH1 out
CH2 out
FIGURE 26: AES3 from AESOP.
Bias Series User Guide V1.0
Page 17