Information volume of communication

Содержание и основные понятия

▪ Contents
Section 12.1
Information volume of communication
I=K×i, data conveyor, calculator, task bank.
The information volume is the number of bits that takes over the message.
GEF 7 kL
OGE No. 1
EEG No. 11
01
Basic formula
I = K × i
I
- volume in bits
K
- number of symbols
i
- the weight of the symbol in the bits
Symbol weight: N = 2
i
→ i = log
2
(N)
×
=
=
I
volume (beat)
K
Symbols
i
bat/symsol
I = K × i
Knowing any two sides of the triangle, we'll find a third.
02
N=2
i
Schedule
i =
4
N =
16
2
i
=
2
4
1 symbol =
8 bits
03
Visualization I=K×i
📊
Public service announcements
K
16
i
8
I =
128
bt
=
16
Byte
=
0.016
KB
Example from the EGE
The password is 15 characters from a 12-symbol set.
i = log
2
(12) ~ 3.58 ~ round up to
4 bits/symbol
15 × 4 = 60 bits Ceil(60/8) =
8 bytes
password
Read: 400 byte / 20 users =
20 bytes
04
Examples
1.
128 characters, alphabet 64.N=64=2
6
, i=6.
I=128x6=768 bits=96 byte
2.
KOI-8 volume 3.5 KB K=28672/8=
3584 Symbols
3 (GED).
2 pages on 48 lines, 64 characters, Unicode. K=6144.
I = 98304 bits = 12 KB
05
Calculator
📈
I=K×i
K
Codes
06
Data conveyor
📦
Conwayer
Type:
Channel:
07
Task bank
✍
12 tasks
08
Mini test (5 out of 40)
XP:
0
0/0
Press Start Quest