Glossary - Sony PCS-1500 Service Manual

Videomeeting Room Layout
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.
(Bad)
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.
(Good) (Bad)
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.
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Appendix

Glossary

BRI ISDN
An abbreviation for Basic Rate Interface. Single An acronym for Integrated Services Digital
ISDN has two B-channels and one D-channel. Network. This is a communications protocol by
CCITT on transmission of integrated voice,
CIF video, and data. Bandwidths include basic
An abbreviation for Common Intermediate (64 Kbps) and primary rate (1.544 and
Format. This format allows to communicate 2.048 Mbps).
with between different color systems (NTSC or
PAL). ITU-T
352 pixels × 288 lines (30 frames per second)
An abbreviation for International
Telecommunication Union,
Codec Telecommunications.
An abbreviation for Coder-Decoder. An
electronic device that converts an analog signal Lip synchronization
(such as voice or video) to a digital data stream, A function that synchronizes sound with
compresses it, and sends it over a digital motion. Sound processing is much faster than
communications line. Another codec reverses motion processing, thus sound and motion
the process at the receiving end. sometimes get out of step with each other.
Echo PBX
Reflection of sound from walls and other An abbreviation for Private Branch eXchange.
surrounding objects.
P in P
Frame rate
An abbreviation for "Picture in Picture." This is
The number of frames which can be decoded in a function which allows the user, to monitor
one second. their own party on a small window on the TV
monitor.
G.722
QCIF
7 kHz audio-coding within 64 Kbps.
An abbreviation for Quater CIF. The number of
G.728
pixels is a quarter than one of CIF format.
176 pixels × 144 lines (30 frames per second)
Coding of speech at 16 Kbps using low-delay
code excited linear prediction.
SPID
H.221
An abbreviation for Service Profile ID.
Frame structure for a 64 to 1920 Kbps channel
Still picture
in audiovisual teleservices.
Still, unmoving pictures, as in a photograph.
H.261
Video codec for audiovisual services as p ×
Sub-address
64 Kbps. An identification number given to devices
sharing a common ISDN line .
H.320
Narrow-band visual telephone systems and Terminal adaptor
terminal equipment. A device used to connect various equipment to a
digital line. The device sits between the
Interface
equipment and the digital line and checks that
A device that goes between two different signals are correctly sent or received.
devices so that they can communicate with each
other. V.35
This interface is frequently used for data
communication since this transmits data at high
speed.
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Appendix