Glossary – Grass Valley K2 ASI Media Client Installation User Manual
Page 35
August 14, 2008
K2 ASI Media Client
35
Glossary
Ancillary Data
Digital data carried in the non-active video regions of a serial digital interface (SDI)
stream as defined by SMPTE 291M.
ASI
Asynchronous Serial Interface.
Channel
A set of resources that together have the ability to record or play media.
Clip
Portion of recorded stream corresponding to a useful asset.
Compression Layer
The compression layer is the compressed elementary stream and associated metadata
that describes the elementary stream. Usually this layer is organized into variable
length packets with headers and payloads of data, in which case the bit stream is called
a packetized elementary stream, or PES.
See the appropriate MPEG-2, DVB, or ATSC standards for more information.
See also
Configuration Manager
A tool in K2 Media Client that configures system settings.
Cue Tone
Also called trigger tones. Signal that is broadcast by the network feed and intercepted
by the video switch. Cue tones notify the systems of breaks in programming during
which events can be aired. Cue tones can be initiated by a tone from a network or by
contact closure. There are two types of cue tones: start tones trigger an insertion to
begin, and stop tones can stop an event that is being played.
Drop Frame
Drop frame is a timecode adjustment that applies to NTSC video only. Due to the
framerate of NTSC, a system that normally outputs 30 frames per second must adjust
timecode by subtracting two frames every minute except every tenth minute to
achieve the effective framerate.
Drop Frame Timecode
Drop-frame time code yields precise running times, but frames are not all numbered
sequentially. A frame number must be dropped periodically to keep the clock right.
In non-drop time code, all frames are numbered sequentially, but the ending time code
of a program does not accurately give the program's length.
Ethernet
A local area network used with some remote protocol applications; it operates over
twisted wire and over coaxial cable.