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Lecture 3

MMEDIA 1A03 Lecture Notes - Lecture 3: Cjk Characters, Wav, Times New Roman


Department
Multimedia
Course Code
MMEDIA 1A03
Professor
David Ogborn
Lecture
3

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Class 3 Mulmedia
Calculang media size
intensity → numbers → 1 1 0 1 0 0 1 1
pixels → column &rows
1024 column & 768 rows
colour model RGBA (Red Green Blue Alpha) Transparency for Alpha
Example 1. 4 channel with each with 8 bits 4 x 8 x 1024 x 768 = 25,165,824 bits data size
Example 2. 320 x 240 = 76,800 pixel RGB ( 8 bits) x 24 = 1,843,200 bits data size
Example 3. 1920 x 1080 x 32 = 66,355,200 x 30 = 1,990,665,000 bits data size
Aspect rao → shape of example 3 is 16 x 9 which is square
Bit depth and Sample rate
Example 1. 44,100 Hz x 16 bits x 2 channels = 1,411,200 (1 sec) x 74 minutes x 60 seconds =
6,265,000,000 bits data size
Example 2. 96,000 Hz x 24 bits x 8 channels x 3.5 minutes (210) = 3,800,000,000 bits data size / 8
= 483 million
→ bits have resource costs, not free
kilo 1000 or 1024 is unclear
mega 1,000,000 or 1024 x 1024 or 1000 x 1024
169,000,200 can be counted as 169 megabits or 161 megabits.
ASCII (text) American Standard Code Informaon Interchange → to represent text.
→ 7 bits code that represent one character of text
character from alphabet of English → number → bits
E→ 69 → 1 0 0 0 1 0 1
64 + 4 1 = 69
1 1 0 1 0 1 1
64 32 8 2 1 =
:rst think of 97 and power of 2
128,64,32,16,8,4,2,1 = subtract them to add up to 97
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