Mr Cooper computing

Data representation

Introduction to Binary | IGCSE Computer Science | Learnlearn.ukStarter – Morse Code Morse code stater activity Why do computers use binary? https://www.youtube.com/watch?v=k-5jpns0uTAVideo can’t be loaded because JavaScript is disabled: Why do computers use binary? (https://www.youtube.com/watch?v=k-5jpns0uTA) YouTube blocked at school? Watch the Google Drive version instead. Summary Binary data can be transmitted easily and reliably. Binary data can be stored and read… Read More »Introduction to Binary

Binary Numbers | IGCSE Computer Science | Learnlearn.ukWhat is binary? Binary is a base 2 number system, meaning that all numbers and other data can only represented using ones and zeros. All modern computer systems store data and programs in binary. Why do computers use binary? There are a number of advantages to using binary in computer systems: Key Advantages Binary data… Read More »Binary Numbers

Text Representation in Binary | IGCSE Computer Science | Learnlearn.ukStarter Converting text to binary When computers were first invented most text was represented in binary using the ASCII (American Standard Code for Information Interchange). Converting text to ASCII formatted binary is a simple process. You simply look up the decimal value for the character in the ASCII table below, and then convert that value from… Read More »Text Representation in Binary

Black and White Image Representation in Binary | IGCSE Computer Science | Learnlearn.uk

Grayscale Image Representation in Binary | IGCSE Computer Science | Learnlearn.ukStarter Practice your binary conversion skills using this great game! Grayscale Images The images we have been looking at so far have been very simple, pure black and white images, but when we think of black and white images, we aren’t usually thinking of just black and white, we are thinking of images that contain… Read More »Grayscale Image Representation in Binary

Color Image Representation in Binary | IGCSE Computer Science | Learnlearn.ukBinary RGB Colours Binary RGB Colours are created using a mix of three colours, each set at a different brightness – 0 for black, 255 for 100% brightness. This type of colour system is known as 24bit colour and is the system most widely used world wide! Example Colours using the 24 bit colour system… Read More »Color Image Representation in Binary

Sound Representation in Binary | IGCSE Computer Science | Learnlearn.ukAnalog Vs Digital How is sound recorded? When capturing sound, we need to be able to plot the both the amplitude and frequency of the sound for each point in it time the recording. This can being easily achieved if we simply measure the amplitude of the wave at a set interval of time.… Read More »Sound Representation in Binary

Hexadecimal | IGCSE Computer Science | Learnlearn.ukWhy do we use it hexadecimal? Binary is very difficult for humans to read (especially larger numbers) but computers work in binary, so any usage where you need to be able to inspect and edit the binary directly (such as in machine code/ assembly language) then humans need to be able to read the binary… Read More »Hexadecimal

Compression | IGCSE Computer Science | Learnlearn.ukImage Compression Why do we need image compression? Let’s take the image above. This image is a relatively small 2 Megapixel image, with dimensions of 2133 x 974 pixels. This image is a 24 bit RGB image, meaning that it’s file size should be: 2133 x 974 x 24 = 49.8 Megabits Divide by 8… Read More »Compression

Binary Shifts | IGCSE Computer Science | Learnlearn.ukBinary Shifts https://youtu.be/G-9fwJbgRjAVideo can’t be loaded because JavaScript is disabled: Binary Shifts Tutorial (https://youtu.be/G-9fwJbgRjA) Logical Left Shift In a left shift each bit is simply moved to the left with the empty space on the right replaced with zero. Example 000110 << 2 011000 Notice the ones have moved along 2 spaces Logical… Read More »Binary Shifts

Units and file sizes | IGCSE Computer Science | Learnlearn.ukTalking about file sizes – BYTES Bytes – File Sizes, Memory Sizes Nibble 4 bits (Only need to know this for the exam) Byte B 8 bits Kilobyte KB 1000 Bytes Megabyte MB 1000 Kilobytes 1,000,000 Bytes Gigabyte GB 1000 Megabytes 1,000,000,000 Bytes Terabyte TB 1000 Terabytes 1,000,000,000,000 Bytes When we are talking about file… Read More »Units and file sizes

Binary Addition | IGCSE Computer Science | Learnlearn.ukBinary Addition This video talks through the process of binary addition and how is it can be implemented using logic gates and half/full adders. Binary Overflow When we add two binary numbers together we might end up with a number larger than the space available in which to store it. This is known as… Read More »Binary Addition

Negative Numbers in Binary | IGCSE Computer Science | Learnlearn.ukSign & Magnitude Two’s Compliment Resources Teacher Presentation Two’s Complement Checker Worksheet

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