Filter
Top Products
4–1
4 Audio
4.1 Audio at a Multi-Media Site
Microphones
If security procedures call for viewing the person that is speaking, plan to place
microphones in camera range. However, microphones can be placed independently of
cameras; they have their own cabling. Microphones require amplification to provide line-
level input to a Multi-Media unit; see figure 37.
Fig. 37. Audio input to Multi-Media unit.
Selecting a microphone
Choosing a microphone type (condenser, canon, Lavaliere, and so on), pickup pattern
(cardioid, omni-directional, and so on), sensitivity, whether one needs phantom power,
and other considerations, are beyond the scope of these installation instructions. Unlike
camera domes, you can mix different models of microphone at a site. Please see your
microphone supplier.
Placing a microphone
Microphone placement requires experience with noise sources, sound absorption and
reflections; these topics are beyond the scope of these instructions. Please see your
microphone supplier. See also 4.1.1: Checking for Audio Interference, next.
Speakers
Connect powered speakers to a Multi-Media unit so that people at the site can hear an
operator. See figure 38.