Acoustic Feedback - Bosch DCN Next Generation Installation & User's Instructions
Digital congress network
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Also See for DCN Next Generation:
- Installation and operation manual (286 pages) ,
- Operation manual (290 pages) ,
- Installation and user instructions manual (158 pages)
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DCN Next Generation | Installation and User Instructions | System Design and Planning
6.7
Acoustic feedback
Acoustic feedback ('howling') occurs when the sound of
the loudspeakers or headphones in the system is sent to
the system again by enabled microphones.
table 6. 1 : Acoustic feedback
Source
The acoustic feedback is caused by
the loudspeakers of the contribution
devices.
The acoustic feedback is caused by
an external public address system
that is connected to the DCN Next
Generation digital congress
network.
The acoustic feedback is caused by
the headphones that are connected
to the contribution devices.
Bosch Security Systems | 2007-02 | 9922 141 70525
Quick solution
Decrease the volume level of the
system. For example, with the knob
on the front of the central control
unit (refer to section 8. 1 0.3).
Decrease the volume level of the
public address system or the DCN
Next Generation digital congress
network.
Tell the chairmen and the delegates
to decrease the volume level of their
headphones with their contribution
devices.
Structural solution
Do as follows:
1 Install a feedback suppressor
between audio input 2 and audio
output 2 of the central control
unit.
2 Set the audio routing mode of
the system to Insertion (refer to
section 8.8.2).
Install a feedback suppressor
between audio output 1 and the
input of the external public address
system.
Install and configure the
headphones level reduction of the
contribution devices. (Refer to the
section about the contribution
devices.)
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