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BM-AV2-E16SHD
16 Channel Digital Audio Monitor
User’s Guide
Version 1.0 18/12/2012
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BEL (Digital Audio) Ltd., has made every effort to ensure the accuracy of information contained within
this document, which is nevertheless supplied for information purposes only and does not constitute any
form of warranty or guarantee.
All trademarks acknowledged.
The information in this document is subject to change without notice.
Bel (Digital Audio) Ltd.
Unit 3
Horwood Court
Bletchley
Milton Keynes
Bucks
MK1 1RD
United Kingdom
Tel: +44 (0)1908 641063
Email: info@beldigital.com
Web: www.beldigital.com
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Contents!
!
Introduction!............................................................................................................................................!4!
Main!features!..........................................................................................................................................!5!
Front!panel!controls!................................................................................................................................!6!
Operation!................................................................................................................................................!7!
Selecting!sources!.................................................................................................................................!7!
SDI!input!mode!...................................................................................................................................!7!
Dolby!mode!.........................................................................................................................................!7!
Decoding!AES!inputs!...........................................................................................................................!7!
Decoding!SDI!inputs!............................................................................................................................!7!
Using!the!PROGRAM!switch!................................................................................................................!8!
The!Dolby!mixJdown!...........................................................................................................................!8!
Independent!mo d e!.............................................................................................................................!8!
Directing!sources!to!speakers!.............................................................................................................!8!
Rear!panel!inputs!....................................................................................................................................!9!
Rear!panel!outputs!..................................................................................................................................!9!
Menu!................................................................................................................................ .....................!10!
Top!level!menu!page!.........................................................................................................................!10!
Line!level!output!adjustment!............................................................................................................!12!
Analogue!output!level!.......................................................................................................................!13!
Dolby!Information!.............................................................................................................................!14!
Installation!............................................................................................................................................!15!
Analogue!audio!inputs!and!outputs!..................................................................................................!16!
Specifications!........................................................................................................................................!17!
!
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Introduction!
!!
The BM-AV2-E16SHD is a 2U high-quality sixteen-channel video/audio monitor with an
integral Dolby® decoder. The unit accepts audio from any one of eight AES input pairs, eight
analogue inputs or one of two SDI inputs and produces eight pairs of AES outputs and eight
analogue outputs. The SDI inputs automatically detect SD or HD or 3G video and demultiplex all 16 audio channels. An active loop-through output is available for the SDI inputs.
The video source and menu system is displayed on the 4” video monitor.
The headphone output is taken before the limiters and mutes the speakers when used.
Sixteen high-resolution tri-colour bargraphs are provided with user-selectable ballistics and
colour break points. Up to sixteen PCM audio inputs or eight Dolby decoded audio inputs can
be selected individually or mixed and directed to each speaker.
Bargraph meters are arranged in four groups of four, the left hand groups handle inputs 1 to 8
and the right hand groups handle inputs 9 to 16. Stick-on graticule scales, which may be
applied to the spaces between the front-panel bargraphs, are supplied with the machine.
An integral Dolby decoder can accept Dolby Digital or Dolby E from any AES input pair or
from any of the SDI embedded audio channel pairs. Dolby E is implemented using two
operational modes; ‘Independent’ where all eight channels are available and Dolby Mix-Down
or ‘Program’ mode where a selected mix of channels is available according to the encoding
used. An example would be 5.1 +1 +1, where three ‘programs’ are available; the 5.1 mix
down and the two additional programs, +1 and +1. In independent mode a 16 by 2 mixer
allows any of the Dolby decoded channels to be fed to either or both audio output channels.
This special mix-down facility allows a stereo version of a complete Dolby encoded signal to
be heard for all programs. This is particularly helpful with Dolby E encoded signals where up
to 8 audio signals of a surround sound + source can be heard using individual audio elements
or a complete aural impression by summing some or all of the channels.
The sixteen audio channels are also provided at the rear of the unit as eight pairs of AES
signals on BNC connectors and four pairs of differential analogue signals. The analogue
outputs and line outputs can be at a fixed level or slaved to the front panel volume control.
The analogue and line outputs can be muted independently from the menu or under the
control of the front panel mute switch.
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Main!features!!
4” video monitor.
Eight pairs of unbalanced (BNC) digital audio (AES) inputs.
Eight balanced analogue inputs (Dsub) and two balanced analogue inputs (XLR).
Two auto-sensing SD/HD/3G inputs with loop-through.
Dolby® Digital or Dolby® E decoder.
Dolby mix-down program select switch.
Custom channel mix-downs for de-embedded audio channels and Dolby
independent mode.
Four groups of four tri-colour bargraphs with selectable meter types/ballistics,
colour transition points.
Analogue line output and 8 analogue audio outputs, eight pairs of AES outputs.
Audio/Video status display.
Headphone connector with speaker mute.
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Front!panel!controls!
Volume
The volume of the speaker and headphone output can be adjusted using this control. It
can also be set to adjust analogue and line output level from the menu. Pressing the end
of the control will mute the speaker audio. This can also mute the line and analogue
outputs as selected in the menu.
Balance
This control will differentially adjust the level of the speaker and headphone output.
Pressing the end of this control will centre the audio output.
Dolby pair select
This control will select which pair of audio inputs is applied to the Dolby decoder.
Mode select
This control will set the way in which the monitor will treat the incoming audio. The PCM
position will treat the current audio input as straight PCM encoding and reproduce it
unprocessed on the 16 available channels.
The IND position will decode Dolby encoded information from the selected Dolby pair and
produce 8 audio outputs. These can then be mixed as required.
The positions 1 to 8 will provide a stereo mixdown of the programmes encoded in the
Dolby input.
Menu
Pressing the end of this control will enter the menu mode described in the Menu section.
Input select
Rotating this control will select one of the four audio input sources; Analogue, AES, SDI1
or SDI2.
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Operation!!
Selecting!sources!!
The input source select switch determines which source (Analogue, AES, SDI 1 or SDI 2)
is available to the Dolby decoder, speaker selectors and bargraphs. AES inputs can be at
44.1 kHz or 48 kHz sampling rate.
SDI!input!mode!!
The unit automatically detects SD, HD or 3G video and provides the video mode on the
Status display. The four SDI groups will be demuxed to give 16 audio signals.
Dolby!mode!!
To enable the Dolby decoder, select the ‘Independent’ or ‘Program’ position using the front
panel switch. The unit will decode Dolby Digital and Dolby E from the AES inputs or
embedded audio carried in an SDI signal.
Dolby E encoding allows several separate ‘programs’ or groups of audio to be carried in
the same data stream. The program switch is provided to allow the individual programs to
be selected and their channels directed to bargraphs.
See the section entitled, Using the program switch for more information about the Dolby
E monitoring features available.
Decoding!AES!inputs!!!
Rotate the CHANNEL PAIR switch to select the input carrying the Dolby encoded audio.
The unit will automatically detect and decode the Dolby signals and display up to 8 audio
signals on the bargraphs. The type of Dolby encoding will be shown on the display.
Decoding!SDI!inputs!!
Dolby E or Dolby Digital bit-streams embedded in a pair of audio signals in an SDI stream
can be decoded with up to eight audio signals being shown on the bargraphs. The type of
Dolby encoding used will be shown on the display.
Selecting the channel pair carrying the Dolby encoded signal is achieved using the
CHANNEL PAIR rotary switch. For example, if the Dolby signal was encoded in the
second pair of audio signals in SDI Group 1 this corresponds to channels 3/4 and is
selected by rotating the CHANNEL PAIR select switch to position 3/4.
!
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Using!the!PROGRAM!switch!!
Dolby E encoding allows several separate ‘programs’ or groups of audio to be carried in
the same data stream. The PROGRAM switch allows individual mix-downs and channels
within a Dolby E program to be monitored. Available mix-downs are selected with the
PROGRAM switch. The selected signal is sent to the left and right speakers and the first
two bargraphs (left most looking at the front of the unit).
The following example may help to explain the facilities provided. Consider the situation
where a studio wants to convey a surround sound music signal together with two technical
commentaries for transmitter operators. For the surround sound component, a 5.1
configuration might be ideal since it has 5 audio channels and one LF effects channel as
shown in Appendix A. However, the two independent engineering feeds (two different
languages and not for transmission) can be encoded into two unused channels to give a
configuration of 5.1+1+1.
The!Dolby!mixHdown!!
The operator at the transmitter might want to listen to the music but not necessarily in full
surround sound. Fortunately, the Dolby decoder has an internal buss, which carries a mixdown. This is a stereo signal that contains a mixture of, in this case, all 6 music signals with
any phasing or special effect applied. The Dolby decoder ‘knows’ that the audio is encoded
as 5.1+1+1. In order to listen to the engineering feeds it must be possible to direct the
decoder to select the 5.1, +1 or other +1 signals and output the appropriate mix-down to
the buss. The three separately encoded audio ‘programs’ can be selected using the
PROGRAM switch. Clearly the mix-down of the +1 signals will be a simple mono signal.
When the BM-AV2-E16SHD is in any of the P1 to P8 Program select modes (or Dolby
Down-Mix modes), the stereo audio available on the internal buss is sent to the left and
right speakers and to bargraphs 1&2.
Independent!mode!!
All of the Dolby E audio signals can be decoded and made available on their own (i.e., not
mixed) by setting the PROGRAM switch to the independent position (IND).
In the 5.1 +1 +1 example, music might be presented on bargraphs 1 to 6 and the two
engineering feeds on bars 7 and 8. It is then easy to select which of these to listen to by
pressing the button under the appropriate bargraph. A mix down of some or all of the
channels can be obtained by selecting several audio signals to be sent to each speaker.
Note: Independent mix-down does not apply all of the phasing effects of the Dolby mix
down modes.
Directing!sources!to!speakers!!!
Where more than two audio signals are present (i.e., Dolby E independent mode or deembedded mode), it may be useful to direct and combine sources to selected speakers.
The left speaker is indicated by a red LED and the right by a green LED on the top of the
bargraphs.
To direct a particular source to the left or right speakers proceed as follows:
Repeatedly press the button under the bargraph corresponding to the input audio signal
required until the top LEDs of the bargraph shows red for the left speaker, green for the
right or both to direct the audio to both speakers. Each speaker can receive a mix of audio
from inputs 1 to 16.
Note that the mix button assignments are retained over power-down.
!
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Rear!panel!inputs!
The BM-AV2-E16SHD accepts SDI video, AES and analogue audio inputs. Eight
differential analogue inputs are provided on a 25 way ‘D’ type connector. Inputs 1 and 2 are
duplicated on XLR connectors and sum with the corresponding inputs from the ‘D’ type
connector. Eight pairs of AES unbalanced inputs are available on BNC connectors. Two
SD, HD, 3G auto select SDI inputs are provided.
Rear!panel!outputs!!
The BM-AV2-E16SHD provides both digital and analogue audio outputs on the rear panel.
Eight differential analogue outputs on a 25 way ‘D’ type connector and eight pairs of AES3
on BNC connectors are available. The audio carried on the AES outputs are derived from
the currently selected input source (analogue, AES or SDI). In effect, these audio outputs
are a copy of the signals shown on the unit’s bargraphs. The analogue outputs are derived
from the lower 8 inputs (Ch1-8). They can thus be a copy of the AES inputs, two of the
currently demuxed SDI groups or the eight decoded Dolby signals. Two line outputs are
provided which carry the same audio as the speakers. The levels of the analogue and line
outputs are adjustable in the menu. It is possible to mute the output from the unit’s speakers
by pressing the end of the VOLUME control. It is also possible to independently mute the
analogue outputs and the line outputs using the volume control.
An SDI loop through is available which carries a reconstituted SDI signal from the currently
selected SDI input.
!
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Menu!
Many of the characteristics of the BM-AV2-E16SHD can be adjusted in the menu. When
the menu is activated, by pressing the NAV rotary encoder, the top level of the menu will
appear on the video monitor. The items in this level can be selected by rotating the
encoder and then pressing it for approximately 0.5 seconds. The second level will then
appear and the required item selected by rotating the encoder and then pressing it. At this
point in the menu the value of the current parameter can be adjusted. To go back one
step in the menu press and hold the encoder for longer than 1 second.
Tip: Simultaneously pressing the buttons under the bargraphs 15 and 16 will completely
exit the menu.
The characteristics that can be adjusted in the menu are shown below.
Top!level!menu!page!
The top level of the menu carries the main areas of operation of the BM-AV2-E16SHD
that can be adjusted.
1. Level meters - This section allows access to the bargraph colour break points and
ballistics.
2. Line levels - The line output level control can be selected here (either fixed level or
controlled by the volume control). The line output can also be muted, or slaved to the
main speaker mute control.
3. Analogue levels - The analogue output level control can be selected here (either fixed
level or controlled by the volume control). The analogue output can also be muted, or
slaved to the main speaker mute control.
4. Dolby - Various aspects of the Dolby operation can be accessed here.
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Level!Meter!Adjustment-
Various aspects of the audio level indication can be adjusted here.
1. Amber threshold - The point at which the bargraph changes from green to amber can be
adjusted here. Bargraph 16 is forced to full scale to allow easy control of the colour
transitions.
2. Red threshold - The point at which the bargraph changes from amber to red can be
adjusted here. Bargraph 16 is forced to full scale to allow easy control of the colour
transitions.
3. Ballistics - The scales and dynamics of the bargraphs can be selected here. The options
are AES, DIN, VU and BBC. The appropriate scales should be affixed to the front panel.
4. Analogue offset - When an analogue input is selected and the bargraph ballistics are
AES the way in which this is displayed is adjusted here. If 0 dB analogue is applied to the
unit the bargraph can be configured to show either -18 dB or -20 dB.
!
!
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Line!level!output!adjustment!
The audio currently selected for the two front panel speakers is also available on two XLR
connectors on the rear panel. The level of these can be adjusted from this menu.
1. Line level - The line output level can be fixed or controlled by the front panel volume
control and this can be selected here.
2. Fixed line level - When fixed output level is selected its level can be adjusted here.
3. Line mute - The line outputs can be muted here or the mute can be slaved to the front
panel volume control.
!
!
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Analogue!output!level!
The audio currently showing on the lower 8 bargraphs (1-8) are directed to 8 analogue
outputs on a 25-way ‘D’ connector on the rear panel. The level of these can be adjusted
here.
1. Analogue level control - The analogue output level can be fixed or controlled by the
front panel volume control from here.
2. Fixed analogue output level - When fixed analogue output level is selected, its level can
be adjusted here.
3. Analogue output mute - The analogue outputs can be muted here or the mute can be
slaved to the front panel volume control.
!
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Dolby!Information!
The firmware version of the Dolby decoder card and MetaData information can be
accessed from this menu.
!
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Installation!!
The BM-AV2-E16SHD is designed to be installed in 19 inch bays on an equipment tray.
Ventilation is by natural convection.
The image cannot be displayed. Your computer may not have enough
memory to open the image, or the image may have been corrupted.
Restart your computer, and then open the file again. If the red x still
appears, you may have to delete the image and then insert it again.
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Analogue!audio!inputs!and!outputs!!
Pi
n
1
2
3
4
5
6
7
8
9
10
11
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14
15
16
17
18
19
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25
Description
A 1+
A 1-
GND
A 2+
A 2-
GND
A 3+
A 3-
GND
A 4+
A 4-
GND
GND
GND
A 5+
A 5-
GND
A 6+
A 6-
GND
A 7+
A 7-
GND
A 8+
A 8-
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Specifications!!
Audio inputs
Digital AES3-id 8 x 75 ohm (BNC connector) Sample rate 44.1/48 kHz.
Analogue 8 differential (25-way ‘D’ connector). Clipping +15 dB
Audio outputs
Digital AES3-id 8 x 75 ohm (BNC connector) sample rate 48 kHz.
Analogue 8 differential audio channels, level adjustable (25-way ‘D’
connector).
Line output Copy of speaker outputs, level adjustable on 2 x XLR3M
connectors.
Analogue noise Noise+THD: -108 dB w.r.t clipping
Analogue frequency response: 20 Hz to 20 kHz ±1dB
Video inputs
Video format SDI SD, HD or 3G
Video output
1 SDI active loop-through (BNC connector).
Main drive amp
Noise +THD -80dB w.r.t. maximum output.
Speaker driver units
Peak acoustic level (@2ft) 100 dB SPL
Shielding Magnetic
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Meters
16 tri-colour LED bargraphs with adjustable colour break points and ballistics.
DIN PPM: Overall dynamic range: 55 dB (+5 to -50 dB)
Attack time: 10 mSec
Fallback: 1.5 Sec per 20 dB decay
BBC PPM: Overall dynamic range: (+12 to-12 dB from mark 7 to mark 1)
Attack time: 10 mSec
Fallback: 2.85 Sec (from mark 7 to mark 1)
VU: Overall dynamic range: 23 dB (+3 to -20 dB)
Attack time: 300 mSec
Fallback: 300 mSec
AES/EBU: Overall dynamic range: 60 dB (0 to -60 dB)
Attack time: 1 mSec
Fallback: 1.5 Sec per 20 dB decay
Dimensions
19” Rack Mount: 2U high.
Outline Dimensions: 483 mm(W) x 256 mm(D) x 89 mm(H)
Outline Dimensions: 19 inch(W) x 10 inch(D) x 3.5 inch(H)
Environmental
Temperature 0° C to 30° C Humidity 70% max (non-condensing)
Weight
6 kg (14lbs)
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