BVRAMB Ambient Noise Microphone
Installation Instructions
8
BVRAMB issue 4
C O M M U N I C A T I O N S
3. Set the Sensor Attenuation to -40dB (minimum sensitivity).
4. Set the Dynamic Range to 00dB (maximum output).
5. Set the Speed to Fast.
6. Set the Analogue Input to the input the BVRAMB Ambient
Noise Microphone is connected to.
7. Set Busy Freeze to “N”.
8. Ensure the Program Attenuation shows 00dB (max output).
9. Access each Audio Input in turn that will be controlled by the
ANS, and set the Attenuation (in the Level/Priority menu)
to give an SPL reading 10dB higher than the maximum
predicted Ambient Noise level.
Ensure all inputs are then de-accessed.
10. Set the Dynamic Range to the minimum level required, this
is typically -24dB.
Ensure the Program Attenuation indicates -24dB.
11. In the area served generate a representative constant
Ambient Noise that is 10dB below the predicted maximum
Ambient Noise Level.
Adjust the Sensor Attenuation until the Program Attenuation
indicates -10dB.
12. In the area served generate a representative constant
Ambient Noise that is equal to the predicted maximum
Ambient Noise Level.
Ensure the Program Attenuation indicates 00-02dB.
If necessary adjust the Sens Attenuator to achieve this.
13. Access a DVA Message with periods of silence in excess of 4
seconds and subjectively ensure correct ANS operation while
simulating varying levels of Ambient noise.
14. Set the speed to the required rate. Medium is suitable for
most installations.
15. Set Busy Freeze to "Y" if there are no permanently accessed
inputs (i.e. background music) and the area is highly
reverbant.
This will prevent the ANS system from sensing the echo as
ambient noise and falsely increasing the level.
