Philips LBB 3500 Serie Mode D'emploi page 21

DCN Discussion System
- Press the recess switch 'Start' for the second
Eng
time to start the equalisation procedure.
- During the equalisation procedure a high
pitched noise is audible indicated by a
flashing 'Busy' LED. After the measurement
the filter settings are calculated while the
'Busy' LED is still on.
- Finally the settings are saved in back-up
memory, and the 'Busy LED is switched off.
(This takes a few minutes)
Note: The auto-equalisation process can
be aborted by pressing any key on the
CCU in which case the previous equaliser
settings are restored.
Remarks:
- The frequency response of a room is
dependent on the position of microphone
and loudspeaker used, particularly if a
microphone is relative close to a
loudspeaker. Switching between a
microphone-loudspeaker combination and
another can result in an entire different
frequency response. Therefore,
equalisation has primarily an advantage
if the microphone is in the diffuse field of
the loudspeaker, for example if a
separate PA system is used.
- The equaliser is only active on the
delegate loudspeaker channel and the
equalised PA output. The equalised PA
output is only available on the Audio
Media Interface LBB 3508/00, channel
12.
Loudspeakers
The three rotary loudspeaker controls located
on the front panel of the Central Control Unit
are used for setting the overall system
gain/volume of the DCN's contribution unit
loudspeakers.
- Control (fig.2
volume/gain level of the discussion unit
loudspeakers in 1.5 dB steps throughout the
entire system.
)sets the overall
8
Instructions for use
Note: When turned fully anticlockwise
the audio signal to all system units, with
the exception of the interpreter desk is
switched off.
- Control (fig.2 ) sets the overall system
treble control of the contribution unit
loudspeakers.
- Control (fig.2 ) sets the overall system
bass control of the contribution unit
loudspeakers.
How to Set System Volume/gain level
- Switch on the maximum number of
Active-Micro's (4 plus a chairman unit).
- Select a delegate unit and speak loudly
into it while adjusting the volume/gain
control to the point where audio
feedback is just audible.
- From the feedback point, adjust the
volume/gain control to just below the
feedback level.
8.3 Chairman unit operation (Figure 3)
- Press the microphone button
on the units microphone. Its red LED
indicator ring as well as its red mic. LED
illuminates.
- Press the 'Priority' button
overrule/mute or cancel other active
microphone users. An optional chime tone is
available, when the priority function is used.
(see Note)
Note: The priority function can be set at
the CCU to temporarily or permanently
mute active microphones. In the
temporarily mode, active microphones are
muted for as long as the priority button is
pressed, once released the muted
microphones become active again.
- In the permanent mode, active
microphones are permanently muted
including those on the 'request-to-speak'
list and cannot be switched on again
to switch
to