Honeywell RAPID EYE K9696V2 - Manual (Page 56)

Multi-Media Unit: Installation Instructions
4–2
Honeywell recommends that speakers be placed away from microphones, to
avoid audio feedback.
Fig. 38. Speaking remotely from a PC running View, or onsite using LocalView, an
operator can communicate with people at the site.
Use the “[Audio] In” connector. The “Mic In” connector is disabled.
4.1.1 Checking for Audio Interference
Preventive measures
Checking one’s installation for hard-to-predict situations includes spot-checking for:
•
live audio. Coordinate the testing of audio with fire alarm and security alarm
testing. Using View, connect to that Multi-Media unit and check audio for
feedback and interference, before and during alarms.
•
recorded audio. After a day or two, check for background noise in recordings,
using a retrieval session to spot-check each microphone for a few seconds at
every half-hour or so, during a 24 hour period. This can reveal if microphones
are placed too near sources of background noise such as a vent. Noise is
amplified to a point where it interferes with audio. Hard to predict noise from the
area’s soundscape—rush-hour traffic, passing trains and planes, crowds in a
stadium, and so on—may not have been present during the installation of
microphones and speakers.
Loud alarms should be tested during the installation; they can interfere with
Multi-Media audio. If microphones and speakers are used while alarm bells are
ringing, Honeywell recommends that Multi-Media audio equipment be sonically
insulated from the loudness of the alarms.
Placing a microphone or speaker close to a ringing alarm bell can render either
ineffective: the bell noise can mask the voice of an operator attempting to use the
microphone. The bell could also mask a voice coming from a speaker. Loud alarms
can interfere with microphones or a speaker when they could be needed most.