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M1-Chapter 4(P2) - Coggle Diagram
M1-Chapter 4(P2)
2)Digital Video
Characteristics
1.active pixels and lines
2.digital video
resolution
3.
aspect ratio
-standard:4:3
-widescreen:16:9
4.scanning
-analogue video format:interlaced
-digital video format:interlaced &
progressive
5.framerate
6.Bitrate of digital video
Formulas:
Vertical resolution
Horizontal resolution
Color depth*Framerate
7.r/s btwn Bitrate and Picture quality
-the higher the framerate, the smoother the motion
8.standard definition & high definition
-SD format:interlaced scanning
resolution
-HD format:interlaced & progressive
resolution
9.Serial transmission VS Parallel transmission
-Serial transmission:sending data
one bit at a time
, sequentially over
a communication channel
-Parallel transmission:
simultaneous transmission
of data across
multiple communication channels
1)Advantages of using
digital signals transmission
1.retain quality during transmission
2.transmit over a further distance
3.allows data to be
compressed
Disadvantage of using digital signals transmission
-Cliff effect
-Analogue:can be excellent,may be mediocre(e.g. ghosting,snowing)
-Digital:can construct a
virtually perfect (picture)/may no longer be able to correctly decode the
picture.