BEL DIGITAL AUDIO
BMA2-4SHD
Introduction
2006 BEL (Digital Audio) Ltd
2
Version 0.8
The BEL Digital BMA2-4SHD
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 48kHz. 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
bargaphs.
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. Alarm tone is added just before the speaker
output.
A soft mute is applied to the audio when any select switches are used to reduce glitches.
Note:
The alarm tone level control is mounted inside the unit and is not available from the front
control panel.