1-55
PCS-1500/1500P
108
Appendix
Appendix
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Lighting Considerations
• Do not point the camera towards a window as back lighting
may wash out the contrast. Cover any windows with a thick
curtain.
Adjust room lighting so that it falls on the participants. Avoid
direct light on the TV monitor. Light intensity on faces should
be about 300 lx or more.
If an inverter type or brightness-adjustable type of fluorescent
lamp is used, the sensitivity of the Remote Commander may
deteriorate and the audio unit may be affected by noise. In such
lamps are used, change the position of the Remote Commander
or the location of the microphone.
Videomeeting Room Layout
Appendix
109
Appendix
Glossary
BRI
An abbreviation for Basic Rate Interface. Single
ISDN has two B-channels and one D-channel.
CIF
An abbreviation for Common Intermediate
Format. This format allows to communicate
with between different color systems (NTSC or
PAL).
352 pixels
×
288 lines (30 frames per second)
Codec
An abbreviation for Coder-Decoder. An
electronic device that converts an analog signal
(such as voice or video) to a digital data stream,
compresses it, and sends it over a digital
communications line. Another codec reverses
the process at the receiving end.
Echo
Reflection of sound from walls and other
surrounding objects.
Frame rate
The number of frames which can be decoded in
one second.
G.722
7 kHz audio-coding within 64 Kbps.
G.728
Coding of speech at 16 Kbps using low-delay
code excited linear prediction.
H.221
Frame structure for a 64 to 1920 Kbps channel
in audiovisual teleservices.
H.261
Video codec for audiovisual services as p
×
64 Kbps.
H.320
Narrow-band visual telephone systems and
terminal equipment.
Interface
A device that goes between two different
devices so that they can communicate with each
other.
ISDN
An acronym for Integrated Services Digital
Network. This is a communications protocol by
CCITT on transmission of integrated voice,
video, and data. Bandwidths include basic
(64 Kbps) and primary rate (1.544 and
2.048 Mbps).
ITU-T
An abbreviation for International
Telecommunication Union,
Telecommunications.
Lip synchronization
A function that synchronizes sound with
motion. Sound processing is much faster than
motion processing, thus sound and motion
sometimes get out of step with each other.
PBX
An abbreviation for Private Branch eXchange.
P in P
An abbreviation for “Picture in Picture.” This is
a function which allows the user, to monitor
their own party on a small window on the TV
monitor.
QCIF
An abbreviation for Quater CIF. The number of
pixels is a quarter than one of CIF format.
176 pixels
×
144 lines (30 frames per second)
SPID
An abbreviation for Service Profile ID.
Still picture
Still, unmoving pictures, as in a photograph.
Sub-address
An identification number given to devices
sharing a common ISDN line .
Terminal adaptor
A device used to connect various equipment to a
digital line. The device sits between the
equipment and the digital line and checks that
signals are correctly sent or received.
V.35
This interface is frequently used for data
communication since this transmits data at high
speed.
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