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Introduction 1-3
VisuaLink 128/384 General Description
Phone-Like Dialing
•VoicePoint+ connectivity for
ease of dialing
For those not wanting to dial using the VisuaLink remote, an NEC
VoicePoint+ can be connected to the VisuaLink. (The VoicePoint+ is a
tabletop speakerphone unit for conferencing; providing standard
keypad, built-in microphone and speaker.) With a VoicePoint+, dialing
is as easy as placing a regular phone call. A standard analog phone
set can also be used with VisuaLink.
To make dialing even easier, VisuaLink provides 130 speed-dial
settings. Up to 130 most often used numbers for a videoconference
can be preset in VisuaLink. For easy redial, 20 redial numbers are
automatically stored for both incoming and outgoing calls
Camera Control
•local-end can set far-end
presets
Nine different camera presets can be stored in VisuaLink. The presets
allow camera position (pan & tilt), framing (zoom), and automatic focus
for various positions in a videoconference. To make this easier,
camera presets are stored under identifiable names. With this
capability, each preset can store different camera settings matched to
each named individual in the conference.
A standard feature of VisuaLink is camera voice tracking. Voice
tracking automatically moves the camera to the person speaking by
using one of the camera presets. Voice tracking automatically detects
the audio from a person (from one of three microphones) and selects
the preset stored for that person. The camera will then pan, tilt, zoom,
and focus (using the preset) to show the person speaking. No longer is
a videoconference technician needed to operate a camera controller
or video switcher.
Echo Canceller
•connect up to 3 microphones
Voice quality is an important component in videoconferencing. Users
will tolerate degraded video, but not degraded audio. The echo
canceller improves audio voice quality by eliminating signal echo from
long line communications and clipping caused by some narrow band
systems.
H.320 Videoconferencing Compliance
•settings for higher frame rate
for smoother motion, or
lower frame rate for higher
resolution
VisuaLink is designed to the International Telecommunications Union
(ITU-T) H.320 standard for videoconferencing. Many claim to support
this standard, but few products support all options of H.320.
VisuaLink is designed to fully support the H.320 standard. This overall
standard includes the new option H.263 video standard for higher
resolution low bandwidth processing; and the H.261 video standard for
lower resolution high bandwidth processing (for compatibility with
older systems). Also supported are the standards G.711, G.722, and
G.728 for the audio element of videoconferencing.
VisuaLink incorporates the latest H.320 technology available and
provides backward compatibility in one compact unit. (For additional
information on H.320, see Part 3 of this manual:
Technical Description
- more on H.320 Videoconferencing
.)