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BEL DIGITAL AUDIO
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The front panel user interface consists of 5 rotary controls, an alarms switch, and four
bargraphs. In addition there is a headphone output, two LEDs for sustained anti-phase and a
further five LED indicators.
Selecting sources
The audio source switch routes either analogue or AES source audio to the speaker
selectors, the bargaphs and the monitoring line output.
Using alarms
The BM-A1 can provide the following warnings:
Alarm event
Notes
Audio loss
The currently selected four audio channels are
monitored for persistent under-level. An alarm is
generated when an input is < -30dB (-50dB for
AES meter) for more than 15 seconds.
Audio-over-
The currently selected four audio channels are
level
monitored for transient over-level. An alarm is
generated immediately when the first red
segment of the relevant bargraph is illuminated.
Audio anti-
Audio pairs 1&2 and pairs 3&4 are monitored for
phase
sustained anti-phase.
Note:
The over-level alarm threshold can be adjusted by moving the red bar transition point.
The anti-phase tone and external alarm can only be armed via serial control.
2004 BEL (Digital Audio) Ltd
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The BM-A1front control panel
BM-A1
3
Operation
Alarm indication
Bottom bargraph segment
flashes amber
Audio tone, TTL/serial o/p
Bottom bargraph segment
flashes red
Audio tone, TTL/serial o/p
Phase LED illuminates
Audio tone, TTL/serial o/p
(if enabled)
Version 0.2
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