VADDIO Extreme TX Specifications download pdf (Page 482)

Integrator’s Reference Manual for Polycom HDX Systems

A–2 Polycom, Inc.

means that we must consider sight lines and angles of participant interaction

that go beyond traditional presentation environments. As a rule we should

allow not less than 30 square feet and generally not more than 45 square feet

of floor space per participant in a videoconference space. Though two to three

times what we are used to allowing, this amount ensures that local

participants will see one another and the display of local and remote electronic

images. It also ensures that participants at the far-end will see and hear

everyone arriving at their location via the connection, and that all will see and

hear at a level of quality that does not detract and, in the best deployment,

even enhances the communications.

Having determined the required size of the space, we can move on to the

actual renovation or construction of the space itself. Again the requirements

here are generally less forgiving than those applied in local-only meeting

spaces. In the most basic sense this is because, by sheer definition, at least some

of the participants in a conference-based meeting are not actually in the room.

As such, we cannot count on the typical human mechanisms (the human ears

and brain and our ability to locate sound in three-dimensional space) to

manage any acoustic anomalies.

If we are, for example, in a room that is adjacent to a double-door entry to the

building, then knowing this we can take the inevitable doorway noise into

account as we filter the sounds we hear both inside the meeting room and

coming from that adjacent entryway. Within our own physical and local

environment we have the ability to isolate local unwanted noise from local

“sound of interest” (voices of other people, etc.), and place the unwanted noise

in an inferior position in our conscious thought pattern. We are able to do this

because we know where the noise is coming from and (usually) what is

causing it. We may be annoyed by the noise, but we generally are able to

ignore it. As soon as we add conferencing to the meeting equation, however,

we add the element of electronic pickup and reproduction of all sounds. For

the people at the far-end, the unwanted noise is much more difficult (if not

impossible) to ignore. They do not have the ability to isolate it in

three-dimensional space (the microphones eliminate the spatial reference) and

they often do not know what is making the noise. The brain of the far-end

participant will devote more and more conscious observation and thought

energy to trying to work out these elements, in an attempt to isolate and finally

“ignore” the unwanted sound. We have already stated that they cannot do

this, however, due to the electronic separation between the locations. Thus

they are left with an impossible task that takes up more and more thought

energy, eroding the perceived quality of the spoken communication over time.

Frustration and exasperation quickly set in, and the communication flow

quickly falls apart.

This, then, is one reason we must pay even greater attention to the acoustic and

visual issues for any presentation space that will be connected via conference

to another. Minor, seemingly insignificant anomalies we often ignore in the

local environment become significant impediments to smooth communication

with people at the far-end of any connection. In short, we must always ask

ourselves, “What does this look like and sound like to the people at the

farend?”

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