Text, sound and images

What the syllabus asks of you

• Understand how and why a computer • Text is converted to binary to be processed by represents text and the use of character a computer sets, including American standard code for • Unicode allows for a greater range of information interchange (ASCII) and Unicode characters and symbols than ASCII, including different languages and emojis • Unicode requires more bits per character than ASCII
• Understand how and why a computer • A sound wave is sampled for sound to be represents sound, including the effects of the converted to binary, which is processed by a sample rate and sample resolution computer • The sample rate is the number of samples taken in a second • The sample resolution is the number of bits per sample • The accuracy of the recording and the file size increases as the sample rate and resolution increase Candidates should be able to: Notes and guidance
• Understand how and why a computer • An image is a series of pixels that are converted represents an image, including the effects of to binary, which is processed by a computer the resolution and colour depth • The resolution is the number of pixels in the image • The colour depth is the number of bits used to represent each colour • The file size and quality of the image increase as the resolution and colour depth increase