junger b40 User manual

4ch digital audio limiter
b41
release 2.3.0

The information contained in this manual is subject to change without notice.
This manual is the copyright of Jünger Audio. All reproduction and copying, other than for
legal owner’s personal use, or disclosure of part or whole to a third party, is not allowed
without prior written authorization by Jünger Audio. © Jünger Audio, Berlin 1998-2004
FOREWORD
Thank you for buying and for using the 4-channel Digital Audio
Limiter b41.
Not only you have acquired the latest generation of digital
dynamic range processing, but also a piece of equipment which
is unique in its design and specification.
Please read this manual carefully to ensure you have all the
information you need to use the 4-channel Digital Audio Limiter
b41.
The unit was manufactured to the highest industrial standards
and went through extensive quality control checks before it was
supplied.
If you have any comments or questions about installing, setting-
up or using the b41, please do not hesitate to contact us.
0

CONTENTS
2. Function description .......................................….
2.1 Basic description ...........................................
2.2 Block diagram .............................................
2.3 Audio signal processing ................................
2.3.1 Gain .......................................................
2.3.2 Limiter Threshold............................
2.3.3 Limiter Program....................................
2.3.4 Influence of the signal delay time
2.3.5 Transparent mode ............................
2.4 Remote system ……………………………….
3. Installation .........................................................
3.1 Unpack the unit ...........................................
3.2 Power supply ................................................
3.3 Connections ...........................…...................
3.4 Rack mounting ..........................…................
3.5 Operation safety ..........................……..........
3.6 Synchronization of digital output ..….............
3.7 Remote Control ..................……...................
3.7.1. GPI Remote Control ......…….............
3.7.2. Tally Out .............………....................
3.7.3. Serial Remote Control .......…….........
4. Location of parts and controls ............………......
4.1 Front panel ......................……......................
4.2 Rear panel ...........................………..............
4.3 Switches and jumpers for configuration ........
4.4 Selection of SDI Split Mode ......…….............
4.5 Selection of SDI audio group ........................
2-1
2-1
2-2
2-3
2-3
2-3
2-3
2-3
2-3
2-3
2-4
3-1
3-1
3-1
3-1
3-1
3-1
3-2
3-3
3-3
3-4
3-5
4-1
4-1
4-3
4-4
4-5
4-5
1

5. Operation ...............................................................................
5.0 Description of setup operation ...........................................
5.1 Mode .............................................................................
5.2 Recalling, saving and editing of presets ...........................
5.3 Input selection …….............................................................
5.4 Transparent mode ............................................................
5.5 Program .…………………………………………………….
5.6 Link …….. ........................................................................
5.7 Threshold ..........................................................................
5.8 Bypass .............................................................................
6. Boot display and trouble shooting ............................................
6.1 Boot display .......................................................................
6.2 Error messages and trouble shooting ................................
6.3 Initialization the unit ............................................................
7. Application notes ......................................................................
7.1 B40 series with SDI interface .............................................
7.2 Basic working modes with SDI ...........................................
7.3 Remote control with brc …..................................................
8. Technical specifications ...........................................................
9. Warranty and service information ...........................................
5-1
5-1
5-2
5-2
5-4
5-4
5-4
5-4
5-5
5-5
6-1
6-1
6-1
6-2
7-1
7-1
7-1
7-3
8-1
9-1

2. FUNCTION DESCRIPTION
operation manual b40, chapter 2 -Function description- page 2-1
FUNCTION DESCRIPTION
The digital dynamics processor b41 is a professional studio
device that processes the dynamic range of digital audio
signals.
The dynamic range processor principles developed by Jünger
Audio enables the limiter to work with exceptionally high audio
quality, without coloration, pumping, breathing, distortion or
modulation effects sometimes associated with this type of
processor.
In short almost inaudible processing - with ease of use. The
outstanding quality of the processing is based on the Multi-Loop
dynamic range control principle developed by Jünger Audio.
The unit is easy to operate and requires only a limited number of
settings to be made by the user to achieve optimum results. All
other parameters necessary for inaudible processing are
continuously automatically controlled in response to changes in
the programme signal.
features
• 4-channel digital audio limiter
• various link modes: 4-ch, stereo 1/2 or 3/4, ch1...4
independent
• adjustable input gain (channel independent) -15...+15 dB
• adaptive controlled dynamic range processing
limiter on/off, THRS 0...-20 dBFS, PROgram 1..4
• user friendly preset and recall function (10 presets)
• pairwise bit transparent mode input to output
• extern sync mode, AES/EBU or VIDEO (or SDI if
optional SDI-interface is present)
• RS-422 interface for serial remote
• GPI interface for parallel remote control, tally output
2.1
BASIC
DESCRIPTION
2

2. FUNCTION DESCRIPTION
page 2-2 operation manual b40, chapter 2 -Function description-
2.2
BLOCK DIAGRAM

2. FUNCTION DESCRIPTION
operation manual b40, chapter 2 -Function description- page 2-3
All signal processing is done in the digital domain by Texas
Instruments floating point signal processors. The use of 32 bit word
length for calculation ensures that there is no deterioration in signal
quality, even if an audio signal with a maximum word length of 24 bit is
input into the processing of the unit.
GAIN means linear amplification of input or output signals. The input or
output gain can be changed in steps of 0.1 dB , within a range from -
15...+15 dB.
Adjustment of GAIN is channel independent.
The static characteristics of the b41 usually refers to a digital output
level of 0 dBFS (dB Full Scale). This is useful for most applications of
the dynamics processor as the on-following digital recording system is
supposed to be balanced down to the final bit.
For applications using headroom the output level of can be adjusted
within 0 ... -20 dBFS in steps of 0.1 dB. The limiter threshold
determines the maximum output level.
It is possible to choose one of four different programs for the
dynamics processor. Each provides ideal dynamics control for a
different kind of program signal as follows:
1 - universal
2 - classic
3 - pop music
4 - speech
Selecting a particular program sets up the optimum parameters of the
Limiter (attack and release times, threshold levels and interactions
between the multiple signal dependent control circuits) for a particular
kind of program material.
The time constants related to the transient response of the control
circuit are important for distortionfree processing. They are always
adaptively controlled. The algorithm has to guarantee best reaction for
fast increasing level of transient signals anytime even if classical music
with slow dying out characteristic is processed. In all cases the attack
time of the limiter for very short transients is zero.
The release time of the control circuit has influence to the increase of
loudness.
The selection of the parameter PROGRAM changes the range of time
constant values as follows:
PRO processing time corresponds to program
----------------------------------------------------------------------------------------------
5 ms to 0.5 sec LIVE
15 ms to 1.2 sec SPEECH
30 ms to 2.5 sec POP
70 ms to 5.0 sec UNIVERSAL
50 ms to 8.0 sec CLASSIC
2.3
AUDIO SIGNAL
PROCESSING
2.3.1
GAIN
2.3.2
LIMITER
Theshold
2.3.3
PROGRAM

2. FUNCTION DESCRIPTION
page 2-4 operation manual b40, chapter 2 -Function description-
The audio signal delay through the dynamics processor is approx.
2ms due to delaying of the audio signal using internal memory. A
small delay is deliberately introduced to the audio signal in order to
allow limiter and compressor algorithms which can 'preview' the audio
signal before changing it. That is the signal curve can be changed
before maximum level is reached. This delay must be considered
before attempting to mix signals processed by the dynamics
processor with other undelayed signals.
When mixing together a delayed signal and a direct signal there may
be cancellation of the signal waveform at some frequencies and re-
inforcement of the waveform at other frequencies (comb filter effect).
Corresponding 2ms delay of direct signals should therefore be carried
out before mixing them with delayed processed signals.
In case that the input signal (audio pair 1/2 or/and 3/4) is not audio (but
AC-3, Dolby E, MPEG..) the input can be feeded directly to the related
output bit transparent (no bit changes). The unit is switching to
transparent automatically if “non audio” flag in the Channel Status Bit of
the AES signal is set. Otherwise transparent mode can be set manually
by the user.
The digital audio limiter b41 is fitted with an serial remote interface in
RS-422 format.
Every device needs a device address to be registered in a remote
system. The address can be selected with the ADDR switch on the
rear panel. 16 addresses are selectable (0..F).
The changed address is valid with next power-on reset.
Up to 16 limiter b41 can be controlled from one remote panel.
Device model name and device address are to recognize using the
remote protocol of serial remote interface by an automation system or
by PC. With it various boxes can be combined in one remote system or
remote chain. However a maximum of 16 devices per model can be
controlled in one chain.
2.3.3.
INFLUENCE OF
SIGNAL DELAY
TIME
2.3.4
TRANSPARENT
MODE
2.4
REMOTE SYSTEM

3. INSTALLATION
Operation manual b41, chapter 3 -installation- page 3-1
INSTALLATION
The digital audio limiter b41 was carefully packed in the factory
and the packaging was designed to protect the equipment from
rough handling. Please examine carefully the packaging and its
contents for any signs of physical damage, which may have
occured in transit.
The digital audio limiter b41 is a device under the safety
category Schutzklasse 1 in keeping with the VDE 0804
standards and may only used with power supply installations
built according to regulations.
Check the voltage details printed at the rear panel are the same
as your local mains electricity supply.
The digital audio limiter b41 is equipped with standard
connectors (see also chapter 3).
Before connecting the digital audio limiter b41 switch the power
off at all connected units.
The digital audio limiter b41 is made as standard 19“ unit (EIA
format). It occupies 1 RU (44 mm height) space in a rack.
Please allow at least additional 3“depth for the connectors on the
rear panel.
When installing the unit in a 19“ rack the rear side of the unit
needs some support, especially for mounting in flight cases.
The digital audio limiter b41 should not be installed near units
which produce strong magnetic fields or extreme heat. Do not
install the filter processor directly above or below power
amplifiers.
If, during operation, the sound is interrupted or displays no longer
illuminate, or if abnormal odor or smoke is detected immediately
disconnect the power cord plug and contact your dealer or
Jünger Audio.
3.1
UNPACK THE UNIT
3.2
POWER SUPPLY
3.3
CONNECTIONS
3.4
RACK MOUNTING
3.5
OPERATION
SAFETY
3

3. INSTALLATION
page 3-2 Operation manual b41, chapter 3 -installation-
The digital audio limiter b41 has a digital signal output only. To
the problem-free combination of following digital devices, the
digital signal processing can be locked to an external clock
reference. The selection of the corresponding input is made in
the SYNC MODE menu. If the chosen sync input is connected
with the sync signal, this signal is used for synchronization
automatically. The digital output signal can be clocked with the
following clock frequencies:
CH 1/2 locks with the clock frequency of the input signal at
digital input CH 1/2 (AES/EBU, 48 kHz)
EXT SYNC locks with the clock frequency at the
external sync input (AES/EBU, 48 kHz)
VIDEO locks with the clock at the Video sync input
(internal 48 kHz)
SDI VIDEO locks with the clock at the SDI input
(internal 48 kHz)
Both digital outputs CH 1/2 and CH 3/4 are locked with same
clock frequency.
Note: SDI sync is available only if SDI interface is installed!
3.6
SYNCHRONIZATION
OF
DIGITAL OUTPUT

3. INSTALLATION
Operation manual b41, chapter 3 -installation- page 3-3
The digital audio limiter b41 can be remote-controlled by means
of parallel GPI contacts.
use : remote-controlled changeover of presets
connector: D-SUB 15pin, female
Pin assignments
Pin Signal name Logic I/O Functions
1 PRESET1 L I recall preset1
2 PRESET2 L I recall preset2
3 PRESET3 L I recall preset3
4 PRESET4 L I recall preset4
5 PRESET5 L I recall preset5
6 PRESET6 L I recall preset6
7 PRESET7 L I recall preset7
8 PRESET8 L I recall preset8
9 MUTE L I Muting outputs
10 BYPASS L I bypass on
11 not used
12 Phase rev ch1/2 L I
13 Phase rev ch3/4 L I
14 Common pin External voltage feed
15 +5V O Test power source
Ground on shield of the connector only!
Electrical specification:
GPI input potential free by opto-coupler, low active
OFF: +3.5…+30V between GPI input
and pin14
ON: less then 1.5V
Note: If using an external voltage feed it has to be connected to pin 14!
External Ground is switching the GPI on any of the inputs.
An internal voltage feed is available on pin 15. Ground is available from the
shield of the connector only! By using the internal voltage feed (connect PIN
14+15) there is no electrical isolation given anymore.
3.7
REMOTE
CONTROL
3.7.1
GPI REMOTE
CONTROL
(PARALLEL
REMOTE)
Pin1...13
Ext. voltage
feed+3
,
5...30V
Pin14
Contact to
ext. Ground
min. 50 ms
+1,5V
+3,5...30V

3. INSTALLATION
page 3-4 Operation manual b41, chapter 3 -installation-
The digital audio limiter b41 can transmit specific device
statuses via parallel Tally lines.
use: Control of the remote-controlled changeover of
presets
connector: D-SUB 15pin, male
Pin assignments
Pin Signal name I/O Functions
1 T1 open contact O preset1 recalled
2 T2 open contact O preset2 recalled
3 T3 open contact O preset3 recalled
4 T4 open contact O preset4 recalled
5 T5 open contact O preset4 recalled
6 T6 open contact O preset4 recalled
7 T7 open contact O preset4 recalled
8 T8 open contact O preset4 recalled
9 T9 open contact O mute
10 T10 open contact O bypass
11 T11 open contact O Not used
12 T12 open contact O Not used
13 T13 open contact O Not used
14 T14 open contact O Not used
15 root Common root contact
3.7.2
TALLY OUT

3. INSTALLATION
Operation manual b41, chapter 3 -installation- page 3-5
Electrical specification:
Tally output type: normally open relais contacts
Contact rating: 1A 24 VDC, 0,5 A 125 VAC
max. 30 W 62,5 VA
max. 60 VDC, 125 VAC
Pin1...14 Tally output
Open contact
Pin15 Common root
contact

3. INSTALLATION
page 3-6 Operation manual b41, chapter 3 -installation-
The digital audio limiter b41 can be remote-controlled by means
of serial remote RS-422.
use : remote-controlled changeover of presets
protocol: available on request
connector: D-SUB 9pin, input - female
output - male
Pin assignments
The cable is wired 1:1 completely, the shield of the cable must be connected
on both ends!
REMOTE IN
Pin Signal name Functions
1 DSR + out Data set ready
2 DSR - out
3 SENSE in Interrogation Remote
4 RXD + out Receive data
5 RXD - out
6 DTR + in Data terminal ready
7 DTR - in
8 TXD + in Transmit data
9 TXD - in
REMOTE OUT
Pin Signal name Functions
1 DSR + in Data set ready
2 DSR - in
3 GND GND
4 RXD + in Receive data
5 RXD - in
6 DTR + out Data terminal ready
7 DTR - out
8 TXD + out Transmit data
9 TXD - out
Electrical specification:
signal in-/outputs TTL-level
3.7.3
SERIAL REMOTE
CONTROL
(RS-422)

4. LOCATION OF PARTS AND CONTROLS
LOCATION OF PARTS AND
CONTROLS
4.1.
FRONT PANEL
4
All control elements gives direct access.
In menu modes the alphanumeric display above the related
button or rotary knob is showing the specific function.
Preset selection Output level
display
Input level
display
CONTROL
ELEMENTS
mode
input
Output
settings
Mains
switch
Sync selection
Input settings
Input gain Limiter
fig. 1: front panel b41
SYNC selection of sync input
IN / OUT group selection for SDI input/output
PREVIEW offline editing of presets
PRESET preset selection and administration
1/2 and 3/4 input selection AES / SDI
TRANSPARENT bit transparent mode for ch1/2 or ¾
Operation manual b41, chapter 4 -location of parts and controls- page 4-1

4. LOCATION OF PARTS AND CONTROLS
input MASTER ganging control knob for ch1…4
GAIN selection (push) and adjustment (turn)
of output gain
PROGRAM selection of limiter characteristic
limiter
LINK selection of channel link mode
THRESHOLD adjustment of limiter threshold
output BYPASS switches bypass on and off
page 4-2 Operation manual b41, chapter 4 -location of parts and controls-

4. LOCATION OF PARTS AND CONTROLS
4.2.
REAR PANEL
SDI IN-/
OUTPUT DIGITAL
INPUTS DIGITAL
OUTPUTS
SYNC IN
SERIAL
REMOTE
IN/OUT GPI REMOTE
IN/OUT
fig. 2: rear panel b41
POWER INPUT
IEC mains input connector 100-240V, 50/60 Hz with integrated fuse
REMOTE
serial remote interface RS-422
connector: 9pin SUB-D, input - female, output - male
GPI
paralle remote interface
TALLY-out open relais contact
connector: 15pin SUB-D, male
GPI-in +3,5…+30V potential-free
connector: 15pin SUB-D, female
SYNC
AES/EBU input for ext. sync signal (AES 3 format, 75 Ohm, unbal)
connector: BNC socket
VIDEO input for video sync signal (blackburst, 75 Ohm, unbal)
connector: BNC socket
W-CLOCK output for wordclock sync signal, TTL level, unbal.
connector: BNC socket
SDI IN / OUT (only if installed!)
Input/output for serial digital video (ITU-R BT.601, SMPTE 272M-A)
with embedded audio
Format: 270 Mb/s, 525/625 line rate, 75 Ohm,
connector: BNC socket
DIGITAL IN
input for AES/EBU standard format
connector: XLR female panel jack
1- ground, 2-3 signal, balanced
connector: BNC socket 75 Ohm, unbalanced
DIGITAL OUT
output for AES/EBU standard format
connector: XLR male panel jack
1- ground, 2-3 signal, balanced , 4 Vpp
connector: BNC socket 75 Ohm, unbalanced, 0.5V pp
Operation manual b41, chapter 4 -location of parts and controls- page 4-3

4. LOCATION OF PARTS AND CONTROLS
4.3
SWITCHES AND
JUMPERS FOR
CONFIGURATION
Some basic settings are to select by switches on the rear panel
or by switches and jumpers at the internal circuit boards of the
unit. These settings can occur general changes for operation
and should made by qualified engineering staff only.
Rear panel
Selection of the device address for serial
remote, 16 device addresses selectable
Note: Within a line of remote controlled units every
device needs a different address! The selected
address is valid after next power-on reset of the unit.
Internal
To set any internal jumper or switches it is necessary to open
the unit.
PLEASE DO NOT MAKE ANY ALTERATIONS WITH THE
MAINS STILL CONNECTED TO THE UNIT!
Loosen the screws on the top cover and remove. Then you can
see all jumper and switches as shown in the drawing below.
After setting of jumper or switches reassemble the unit in
opposite order.
Main board
SDI
Interface
J1
SDI Split
B4x
J2
Download
DSP card
page 4-4 Operation manual b41, chapter 4 -location of parts and controls-