Specifications

FCS1362 Page 39 of 74 © Nov 2010
All components should be installed in accordance with section 2 and with the principal user in mind as
per section 3.2, with the following criteria met:
• driver’s view of the road scene is not obstructed in accordance with Appendix H.
o For further information see ISO 4513 and MOT legislation (Appendix B).
• is as close as practicable to the driver’s field of vision
• has any required controls accessible without distraction
• allows for easy insertion and removal of handset
• does not impede vehicle controls, airbag etc as per section 2.5
• is securely mounted as per section 2.6
4.4.1. Slave handset/fist Microphone
Ensure the handset is mounted in a position such that it can be lifted to the driver’s head height when in a
normal seated position.
Any cabling must not interfere with vehicle controls either when in use or stowed.
Handsets incorporating displays and controls should be located as per the points in section 4.4
4.4.2. Hands free microphone
Microphones are usually directional and need to be pointed towards the user to pick up speech.
Mount the microphone on a non-resonating panel in a position ideally not more than 50cm from the user’s
mouth.
Ensure the microphone will work with the vehicle’s sun visor in all positions and is clear of all normal
driver movements.
Where possible the microphone should be installed near the front roof light cluster. Locating the
microphone on the pillar near the window may result in interference when it is in use should the window
be open.
Consideration must be given to avoid reflecting surface feedback to the microphone off pillars, windows
and so on. This can affect the echo cancelling features of the microphone’s audio pickup leading to
interference and poor performance.
The microphone feed wire should be routed as per section 4.3.1.
If routing the cable past pillar mounted airbags the cable run must be arranged so that airbag deployment
is not compromised.
4.4.3. Loudspeaker
The loudspeaker should be positioned to provide an unobstructed audio path to the user and in such a
way to make certain that any vehicle occupant is not likely to suffer discomfort from excessive audio
levels.
To avoid the possibility of acoustic feedback the loudspeaker should not point directly towards the
microphone.
The distance between loudspeaker and microphone should comply with manufacturer’s recommendation.
Securely fit the loudspeaker to a firm surface or panel as per section 2.6
Consider any equipment behind the panel, e.g. airbag actuator, fuel cut-off switch, and the possible
adverse effect the speaker magnet’s magnetic field may have on it.
4.4.4. Microphone and loudspeaker positions
Microphone and loudspeaker positions should be selected to avoid audio clipping or feedback problems
that could be caused by
• the units being too close together
• the units directly facing each other
• mounting the microphone on a resonating panel