# Questions tagged [encoding-scheme]

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### Is Morse Code binary, ternary or quinary?

I am reading the book: "Code: The Hidden Language of Computer Hardware and Software" and in Chapter 2 author says: Morse code is said to be a binary (literally meaning two by two) code because ...
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### Why is this code uniquely decodable?

Source alphabet: $\{a, b, c, d, e, f\}$ Code alphabet: $\{0, 1\}$ $a\colon 0101$ $b\colon 1001$ $c\colon 10$ $d\colon 000$ $e\colon 11$ $f\colon 100$ I thought that for a code to be uniquely ...
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### Prefix encoding of algebraic data types

I'm new to coding theory and formal proofs, and am struggling to understand how to construct and reason about prefix-free encoding algorithms on algebraic data types. I hope it's clear if I use ...
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### integer = c lg n (inputs of size n, Cormen 3rd, page 23)?

I just started with my "Algorithms" course. But my CS-background is lower than that of an average CS-student (I'm a data science student). Only had intro-2-prog course (Python/Java), that's it. ...
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### Most Efficient Way to Map Generic Input To Generic Output

Lookup tables are one way to map x values to f(x) values. This lets you do computation in advance, and can give a low cost (performance wise) answer to complex calculations when they are needed in ...
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### Viewing images that compressed using lossless algorithms

I am just trying to understand a few minor details regarding images that are compressed with lossless algorithms such as RLE. If a bmp image is compressed using RLE, when does the decompression ...
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### Typical set in Shannon's source coding theorem

I was following the textbook by David Mackay: Information theory inference and learning algorithms. I have question on asymptotic equiparition' principle: For an ensemble of $N$ $i.i.d$ random ...
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### Source Coding Theorem: what happen when go below N⋅H(x) bits?

I was following the text book by David Mackay: information theory inference and learning algorithms, this could be found online on his website. I have question on the source coding theorem (emphasis ...
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### Determining key from plaintext and ciphertext (Vigenère)

I was wondering why mathematically we can know the key in the Vigenère cipher if we know in advance a message and its encryption.
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### How much bits need to add to 100bit of data in order to correct up to 10bits?

I'm trying to calculate how much minimum bits need to be added to data of 100bits, in order to correct 10 bits that are messed up by: bits that deleted (Erasure Correcting) bits that corrupted (Error ...