1.2 Coding Techniques

• ⭐️ concept of coding and decoding
• ⭐️ combination of both: codec
• ⭐️ coding: make into binary
• ⭐️ VLC, FLC difference
• ⭐️ short questions

⭐️ What kind of coding techniques are there?

✅ VLC

Variable Length Code

• code in which every symbol(word) has a different length in binary
• there are always special rules and special characters to seperate the letters and to seperate words

A ➡️ 01
H ➡️ 0000
U ➡️ 001

• 👎🏻 More difficult to figure out the portions of the message as each symbol has different legnth
• 🛠️ used in war environments
• 🛠️ morse code

✅ FLC

Fixed Length Code

• code in which all symbols have the same length
• the number after FLC means the length of every symbol
• FLC-4: is code is FLC, and each symbol has length of 4

red ➡️ 0011
blue ➡️ 1100
yellow ➡️ 0001

❓ If I got 010111001101(12bits) and it is FLC-4
A: it would be 0101/1100/1101

• 👍🏻 Easy to break the message into portions
• 👍🏻 much less accidents in FLC
• 🛠️ used for commercial or standard purposes
• 🛠️ SHA-256, SHA-512
• SHA-512 is stronger as each symbol would have longer length

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