BEL BM-AV2-16SHD User manual

BM#AV2#16SHD,

!2012

Version,1.0,Page,1,

BM-AV2-16SHD

16 Channel Digital Audio Monitor

User’s Guide

Version 1.0 18/12/2012

BM#AV2#16SHD,

!2012

Version,1.0,Page,2,

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

BM#AV2#16SHD,

!2012

Version,1.0,Page,3,

Contents!

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BM#AV2#16SHD,

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Introduction!

The BM-AV2-16SHD 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 de-

multiplex 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 input 9 to 16. Stick-on graticule scales, which may be

applied to the spaces between the front-panel bargraphs, are supplied with the machine.

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.

BM#AV2#16SHD,

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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 has no function.

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.

Other positions will have no function, as they are Dolby related and will mute the audio

output.

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.

BM#AV2#16SHD,

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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!!

Not available on the BM-AV2-16SHD.

Using!the!PROGRAM!switch!!

Keep the switch in the PCM position as the other modes only relate to Dolby features that

are not implemented in the BM-AV2-16SHD. If any of the other modes are selected then

the output will mute.

Directing!sources!to!speakers!!!

Where more than two audio signals are present 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.

BM#AV2#16SHD,

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Rear!panel!inputs!

The BM-AV2-16SHD 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-AV2-16SHD 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.

BM#AV2#16SHD,

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Menu!

Many of the characteristics of the BM-AV2-16SHD 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-AV2-16SHD 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.

BM#AV2#16SHD,

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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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