Glossary of Terms
A - B
- C - D -
E - F - G
- H - I -
J - K - L
M - N -
O - P - Q
- R - S -
T - U - V
- W - X -
Y - Z
L
latency
The length of time it takes a packet to move from source to destination;
delay.
life-size
The size of imagery presented on the display is equal to that of real objects or person.
LDAP
Lightweight directory access protocol; a set of protocols for accessing information directories.
LDAP is a simplified protocol based on standards within X.500. Unlike X.500, LDAP supports TCP/IP and
therefore Internet access and services.
loopback test
A testing often found in the menus of videoconference systems. It creates a virtual connection with
itself, and allows the user to see the video and hear the audio signals they are transmitting.
lossless compression
Refers to data compression techniques in which no data is lost. For most
types of data, lossless compression techniques can reduce the space needed
by only about half. Only certain types of data can tolerate lossy compression.
Lossless compression technique when compressing data and programs.
lossy compression
Refers to data compression techniques in which some amount of data is lost.
Lossy compression technologies attempt to eliminate redundant or unnecessary
information. Most video compression technologies, such as MPEG, use a lossy
technique.
luminance
The portion of a video signal that specifies how bright each portion of the
picture is to be. See also Chrominance, S-Video and Composite Video.
| 
