bel Digital Audio BM-AV3S Kasutusjuhend

BM-AV3S

A/V monitor system

User’s Guide Version 1.4 2/10/2009

BEL DIGITAL AUDIO BM-AV3S

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

MK11RD

UK

Tel: +44 ( 0) 1908 641063

Email: [email protected]

Web: www.beldigital.com

BEL DIGITAL AUDIO BM-AV3S

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INTRODUCTION 1

Main features 1

OPERATION 3

S

ELECTING SOURCES 3

B

ARGRAPH SCALES 4

INSTALLATION 5

CONNECTOR I/O 5

RS232 Host interface connector pinout 6

CONFIGURATION 7

Adjusting analog input level 8

Adjusting audio monitor output level 9

Adjusting bargraph break-points and ballistics 10

Inserting bargraph graticules 13

USING MONITORMX SOFTWARE 14

Main Features 14

MONITORMX SOFTWARE OPERATION 15

Running MonitorMx software for the first time 15

Viewing connected frames 15

Configuring alarms 16

Source selection 17

Meter characteristics 17

Disabling local control 17

MONITORMX SOFTWARE INSTALLATION 18

Minimum pre-requisites: 18

Serial cable 18

BM-AV3 SERIAL PROTOCOL 20

OVERVIEW 20

Frame format 20

COMMANDS 22

DATA FORMATS 23

PROBLEM SOLVING 28

BEL DIGITAL AUDIO BM-AV3S

Sample problems and their solutions 29

SPECIFICATIONS 30

BEL DIGITAL AUDIO BM-AV3S Introduction

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The BM-AV3S is a professional audio and video monitor system housed in a 3U rack.

The unit features two speakers, a high quality seven inch TFT video display and an analogue

line output. Audio input signals can be in the form of analog, AES (SPDIF) and SDI

embedded data. The BM-AV3S accepts audio inputs in groups of 4 channels from the

selected source and can direct any two from these to the speakers. Video input signals can

be selected from a pair of SDI inputs or an analog composite input.

Main features

• 2 x SDI and 1 x composite video inputs with seven inch TFT colour video display

• Auto PAL/NTSC detection

• SDI embedded (groups 1 – 4), 2 x AES and 2 x analog audio input pairs

• Option for balanced XLR or unbalanced BNC digital audio I/O

• High-quality, high SPL audio reproduction with soft limiting

• 4 x tri-colour bargraphs with six standard scales and ballistics, adjustable colour

transition points and peak-hold facility

• Line level analog audio output of sources directed to loudspeakers

• Audio follow video facility

• Selected SDI source converted to analog composite video for convenient monitoring

• Headphone connector with speaker mute

• Individually user-calibrated audio level inputs/outputs and metering

• Windows GUI and separate RS232 protocol for remote control of all alarm functions

and audio/video switching

BEL DIGITAL AUDIO BM-AV3S Introduction

The BEL Digital BM-AV3S

All audio inputs are converted to 24 bit digital form and AES inputs are re-sampled using

sample rate converters where necessary at an internally generated 48 kHz. If embedded

audio from a serial digital video input is selected, the sampling clock recovered from this is

used instead.

The audio source switch selects which audio source is available to the speaker selectors and

bargraphs.

The left and right speaker switches select which of the currently selected four audio channels

is available at the speakers after three stages of analog processing.

The selected audio is first passed through factory preset equalization filters. Then electronic

level control is then applied with the balance and volume knobs providing control voltages.

Finally a soft limiter is used to protect the speakers. The headphone output is taken before

the limiters and mutes the speakers when used.

A soft mute is applied to the audio when any select switches are used to reduce glitches.

BEL DIGITAL AUDIO BM-AV3S Operation

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The front panel user interface consists of 6 rotary controls, a menu button, a TFT display and

four bargraphs. In addition there is a headphone output, two LEDs for sustained anti-phase,

and five status LEDS.

The BM-AV3S front control panel

Selecting sources

The audio source switch selects which group of audio sources is available to the speaker

selectors and bargraphs. The possible choices are analog, AES A + B, embedded groups 1

to 4 from either SDI1 or SDI2 or Audio Follow Video (AFV). The video source switch

determines which SDI input audio is de-embedded from.

The AFV position establishes the follow mode, where the audio is automatically selected

depending on the position of the video source switch. For example, composite video

selection will cause analog audio to be selected, SD1 will allow group 1 of the SDI1 serial

digital input to be monitored and SD2 will monitor group 1 from the SDI2 serial digital video

input.

The REM or remote position of the video source switch forces BM-AV3S to be controlled

from the serial port. Any serial commands will then take precedence over the front control

panel.

The image displayed on the TFT can be adjusted by pressing the menu button and then

following the on screen instructions.

Note:

If an SDI video source is selected using the video source switch, that input will provide

de-embedded audio. If the video source switch is in the composite position (or REM with

no active remote video selection) and an SDI audio source is selected, then audio

groups 1 to 4 are taken from SDI1.

BEL DIGITAL AUDIO BM-AV3S Operation

Bargraph scales

The following bargraph ballistics may be selected using internal switches.

Scale type

Range Attack Fallback

AES/EBU: 60 dB (0 to -60 dB) 1ms 1.5 Sec per 20 dB decay

DIN PPM: 55 dB (+5 to -50 dB) 10 ms 1.5 Sec per 20 dB decay

VU: 23 dB (+3 to -20 dB) 300 ms 300 ms

BBC PPM: +12 to-12 dB - mark 7 to 1 10 ms 2.85 Sec - mark 7 to 1

VU EXT: 80 dB (+20 to -60 dB) 300 ms 300 ms

NORDIC: 54 dB (+12 to -42 dB) 5 ms 1.7 Sec per 20 dB decay

BM-AV3S scale ballistics

Stick-on scale graticules, which may be applied to the space between the front-panel

bargraphs, are supplied with the machine.

BM-AV3S scale graticules

Note:

Bargraph colour transition points and peak hold decay may also be adjusted

internally.

Refer to the Configuration chapter for switch settings and graticule fitting

instructions.

BEL DIGITAL AUDIO BM-AV3S Installation

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The BM-AV3S 3U frame may be installed in 19 inch bays with 300 mm depth including

typical cable and connector depth. Ventilation is by natural convection and there are vents at

each side and on the top and bottom covers of the unit.

Frames may be installed into bays, providing airflow through these vents is not impeded.

Connector I/O

All connections, with the exception of the headphone socket, are provided on the rear panel

of the frame. Video inputs and outputs use BNC connectors and all data connectors use 9

way ‘D’ type connectors.

The BM-AV3S balanced audio version rear view

Digital audio I/O may be supported with either XLR connectors for balanced audio or BNCs

for unbalanced audio, depending on the BM-AV3S version.

BEL DIGITAL AUDIO BM-AV3S Installation

RS232 Host interface connector pinout

Connector type: 9 way D female

Speed: 9600 bps

Format: 8 bit, no parity, 2 stop bits

Description

1

Not connected

2

Rx (from host)

3

Tx (to host)

4

Not connected

5

GND

6

Not connected

7

Not connected

8

Not connected

9

Not connected

Note:

A null-modem lead will be required to interface to a PC. See the MonitorMx

software chapter for more details.

BEL DIGITAL AUDIO BM-AV3S Configuration

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Access to BM-AV3S internal adjustments is obtained with the top removed.

BM-AV3S internal adjustments

The following adjustments may be made:

• Monitor output level – SW3/potentiometers main board

• Analog input level – SW4 and SW5/potentiometers main board

• Bargraph settings – SW1 and SW2 main board, near power supply

Warning:

Configuration instructions are for trained personnel. To avoid risk of dangerous

electric shock, do not remove any covers or carry out adjustments unless qualified

to do so.

BEL DIGITAL AUDIO BM-AV3S Configuration

Adjusting analog input level

In the following tables, ON is obtained with a switch lever in the DOWN position. The

adjustments are located on the main board under the output sub-board.

Analog input adjustments – 0 dB setting shown

SW4

Anlg

Input

Setting when ON

1

1 0 dB (0 dBu in = 0 on analog scale)

2

1 4 dB (+4 dBu in = 0 on analog scale)

3

1 8 dB (+8 dBu in = 0 on analog scale)

4

1 Variable – adjacent pot* –10 to +12 dB

5

2 0 dB (0 dBu in = 0 on analog scale)

6

2 4 dB (+4 dBu in = 0 on analog scale)

7

2 8 dB (+8 dBu in = 0 on analog scale)

8

2 Variable – adjacent pot* –10 to +12 dB

SW5

Anlg

Input

Setting when ON

1

3 0 dB (0 dBu in = 0 on analog scale)

2

3 4 dB (+4 dBu in = 0 on analog scale)

3

3 8 dB (+8 dBu in = 0 on analog scale)

4

3 Variable – adjacent pot* –10 to +12 dB

5

4 0 dB (0 dBu in = 0 on analog scale)

6

4 4 dB (+4 dBu in = 0 on analog scale)

7

4 8 dB (+8 dBu in = 0 on analog scale)

8

4 Variable – adjacent pot* -10 to +12 dB

Note:

It is intended that only one switch lever is set ON for each analog input.

The ON position is obtained with a switch lever in the direction of the arrow

(downward in the above drawing).

*Clockwise rotation increases gain.

BEL DIGITAL AUDIO BM-AV3S Configuration

Adjusting audio monitor output level

In the following tables, ON is obtained with a switch lever in the DOWN position. The

adjustments are located on the main board under the output sub-board.

Analog monitor output adjustments – 0 dB setting shown

SW3

Monitor

Output

Setting when ON

1

Left 0 dB (0 on analog scale = 0 dBu on output)

2

Left 4 dB (0 on analog scale = +4 dBu on output)

3

Left 8 dB(0 on analog scale = +8 dBu on output)

4

Left Variable – adjacent pot* 0 to +12 dB

5

Right 0 dB (0 on analog scale = 0 dBu on output)

6

Right 4 dB (0 on analog scale = +4 dBu on output)

7

Right 8 dB(0 on analog scale = +8 dBu on output)

8

Right Variable – adjacent pot* 0 to +12 dB

Note:

It is intended that only one switch lever is set to ON for each monitor output.

The ON position is obtained with a switch lever in the direction of the arrow

(downward in the above drawing).

*Clockwise rotation increases gain.

BEL DIGITAL AUDIO BM-AV3S Configuration

Adjusting bargraph break-points and ballistics

The adjustments, SW1 and SW2 are located near the power supply.

BM-AV3S bargraph adjustments

SW1-8

AES to analog adjust

OFF

ON

-18 dBFS = 0 on analog scale

-20 dBFS = 0 on analog scale

The –18 dB and –20 dB settings define the correspondence between AES input level and the

0 mark on an analog scale. This allows analog scales to be used with digital signals.

Note:

When digital inputs are used with an analogue scale the line outputs will be less than

that indicated on the meters since the digital to analogue converters clip at +15 dB.

The effective loss is -3 dB when the 18 dB position is selected and -5 dB when the 20

dB position is selected.

SW1-7 SW1-6

Peak hold decay

OFF OFF None (Off)

OFF ON 3 seconds

ON OFF 7 seconds

ON ON Indefinite

SW1-5 SW1-4 SW1-3

Scale type

OFF OFF OFF AES

OFF OFF ON DIN

OFF ON OFF VU

OFF ON ON BBC

ON OFF OFF Extended VU

ON OFF ON NORDIC

ON ON OFF No scale

ON ON ON No scale

Note:

The OFF position is obtained with a switch lever in the direction of the arrow, (to the

right in the above drawing).

BEL DIGITAL AUDIO BM-AV3S Configuration

Each bargraph has 53 tri-colour segments. The top and bottom segments are reserved

leaving 51. Up to 31 of the remaining top most segments may be coloured red. Up to 31 of

segments from the end of the red zone downward may be coloured amber. The remaining

segments (if any) are always green.

Choosing how many segments are coloured red from the top of the bargraph sets the ‘red

zone’. Select from none to 31 using SW1-2, SW1-1, SW2-8, SW2-7 and SW2-6 as follows:

SW1-2 SW1-1 SW2-8 SW2-7 SW2-6

Segment from bargraph top

OFF OFF OFF OFF OFF None

OFF OFF OFF OFF ON 1

OFF OFF OFF ON OFF 2

OFF OFF OFF ON ON 3

OFF OFF ON OFF OFF 4

OFF OFF ON OFF ON 5

OFF OFF ON ON OFF 6

OFF OFF ON ON ON 7

OFF ON OFF OFF OFF 8

OFF ON OFF OFF ON 9

OFF ON OFF ON OFF 10

OFF ON OFF ON ON 11

OFF ON ON OFF OFF 12

OFF ON ON OFF ON 13

OFF ON ON ON OFF 14

OFF ON ON ON ON 15

ON OFF OFF OFF OFF 16

ON OFF OFF OFF ON 17

ON OFF OFF ON OFF 18

ON OFF OFF ON ON 19

ON OFF ON OFF OFF 20

ON OFF ON OFF ON 21

ON OFF ON ON OFF 22

ON OFF ON ON ON 23

ON ON OFF OFF OFF 24

ON ON OFF OFF ON 25

ON ON OFF ON OFF 26

ON ON OFF ON ON 27

ON ON ON OFF OFF 28

ON ON ON OFF ON 29

ON ON ON ON OFF 30

ON ON ON ON ON 31

Note:

It is not possible to set 31 red and 31 amber segments, since there are only 51

segments for level display purposes.

BEL DIGITAL AUDIO BM-AV3S Configuration

Choosing how many segments are coloured amber from the end of ‘red zone’ sets the

‘amber zone’. Select from none to 31 using SW2-5, SW2-4, SW2-3, SW2-2 and SW2-1 as

follows:

SW2-5 SW2-4 SW2-3 SW2-2 SW2-1

Segment from last RED ZONE

OFF OFF OFF OFF OFF None

OFF OFF OFF OFF ON 1

OFF OFF OFF ON OFF 2

OFF OFF OFF ON ON 3

OFF OFF ON OFF OFF 4

OFF OFF ON OFF ON 5

OFF OFF ON ON OFF 6

OFF OFF ON ON ON 7

OFF ON OFF OFF OFF 8

OFF ON OFF OFF ON 9

OFF ON OFF ON OFF 10

OFF ON OFF ON ON 11

OFF ON ON OFF OFF 12

OFF ON ON OFF ON 13

OFF ON ON ON OFF 14

OFF ON ON ON ON 15

ON OFF OFF OFF OFF 16

ON OFF OFF OFF ON 17

ON OFF OFF ON OFF 18

ON OFF OFF ON ON 19

ON OFF ON OFF OFF 20

ON OFF ON OFF ON 21

ON OFF ON ON OFF 22

ON OFF ON ON ON 23

ON ON OFF OFF OFF 24

ON ON OFF OFF ON 25

ON ON OFF ON OFF 26

ON ON OFF ON ON 27

ON ON ON OFF OFF 28

ON ON ON OFF ON 29

ON ON ON ON OFF 30

ON ON ON ON ON 31

BEL DIGITAL AUDIO BM-AV3S Configuration

Inserting bargraph graticules

The following bargraph scale graticules are supplied with each BM-AV3S:

BM-AV3S scale graticules

To apply a graticule proceed as follows:

• peel back the protective backing from the chosen graticule

• apply the graticule to the space between a pair of bargraphs

• repeat the process for the other bargraph graticule position

• ensure that the bargraph setting matches the graticule

• adjust the colour transitions and peak hold decay as desired

BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software

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The MonitorMx remote control and status software has been provided to ease the task of

operating and monitoring one or more BM-AV3 units from remote locations.

Main Features

• Fifteen alarm categories

• Signal presence

• Support for multiple BM-AV3 units

• Automatic model detection and custom unit names

• Reads selected meter ballistics

• Full editing of scale transition points and peak hold characteristics

• Visual and aural alarms

• Individual and system alarm reset

• Disable option for local controls

The MonitorMx software will run on Windows 98 Second Edition, Windows NT4. Windows

2000 and XP. It will not run on Windows 95 or Windows 98 First Edition.

BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software

MonitorMx software operation

The MonitorMx application provides monitoring of video and audio alarm status for any local

BM-AV3 frame or multiple-frame system.

MonitorMX main screen

Running MonitorMx software for the first time

The MonitorMx software will search automatically for BM-AV3 frames connected to the serial

ports of the PC the software is running on when the application loads. The Alarms Present

indicator will illuminate red if any of the connected frames are generating alarms. Individual

alarms and alarm configuration will only be shown for selected frames.

MonitorMx will not interrogate or connect to frames on a network.

Viewing connected frames

To view connected frames use the unit select box or select List Devices under the view

menu.

BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software

Configuring alarms

To enable alarms on a selected BM-AV3 frame, check the alarm categories at the left of the

main screen. Toggle inverts the selection. If an alarm is generated the associated virtual LED

will change from green to red and will flash if the Flashing box has been checked. If PC

Sounder has been checked an audio alert will also be sent to a sound card and any

connected speakers if fitted.

System alarms

The Systems Alarms command under the View menu will bring up the systems alarms

window.

The MonitorMX system alarms

System alarms are alarms generated by any connected frame. Controls are provided to reset

alarms from all frames and to enable visual alarm flashing and audible alerts for alarms

generated from any connected frames.

Resetting alarms

Alarms are not automatically cancelled when a monitored signal is restored to normal. To

cancel alarms click on a Reset button for an individual frame or for all frames using the Reset

button in the Systems Alarms window.

Muting alarms

An audio alert in the form of a .wav file can be sent to any sound card and connected

speakers. Mute the alarm by un-checking the PC Sounder box for an individual frame or for

all frames using the Systems Alarms window.

Notes:

Un-checking the PC Sounder box does not affect audible alarms on any BM-AV3

frame(s).

The selective SET function of the front control panel is not required, since any alarm may

be selected individually.

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