topic 12 : coding text, graphics, sound

describe ‘ASCII’ and it’s purpose

a character encoding standard used to represent text in computers, assigning a unique number to each character, including letters, digits, and symbols.

describe ‘Unicode’ and it’s purpose

a comprehensive character encoding standard designed to support text representation in multiple languages, allowing for the consistent encoding of a wide range of symbols and characters.

Unicode was introduced because…

the need for a universal character encoding system that could accommodate different languages and symbols, addressing ASCII’s limitations.

We still use ASCII because…

it’s widely supported and it generally takes up half the amount of storage.

describe ‘parity bits’ and it’s usage

an error checking method that picks up errors by adding an extra bit, ensuring the total binary number is odd or even.

describe ‘majority voting’ and it’s usage

an error checking method

describe ‘check sums’ and it’s usage

describe ‘check digits’ and it’s usage

We know how to interpret a string of binary because…

describe how analog data works

describe how digital data works

what is the purpose of MIDI?

what is the use of MIDI in event messages?

what is the benefit of representing music using MIDI files?

what’s the difference between lossy and lossless compression?