1.2

Text, sound and images

10 flashcards to master Text, sound and images

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Definition Flip

Define the term 'ASCII' and provide an example of its use.

Answer Flip

ASCII (American Standard Code for Information Interchange) is a character encoding standard for electronic communication. It represents text in computers, communication equipment, and other devices.

Example: the ASCII code for the letter 'A' is 65.
Key Concept Flip

What is the primary advantage of Unicode over ASCII?

Answer Flip

Unicode supports a significantly larger range of characters than ASCII, enabling it to represent text in various languages and scripts. This makes it more suitable for global communication and multilingual documents. It supports special symbols too.

Definition Flip

Explain the term 'pixel' in the context of digital images.

Answer Flip

A pixel is the smallest addressable element in a raster image (bitmap). It represents a single point of color, and the combination of many pixels creates the overall image. Higher pixel count generally means more detail.

Key Concept Flip

Describe the relationship between 'resolution' and image quality.

Answer Flip

Resolution refers to the number of pixels in an image, often expressed as width x height (

Example: 1920x1080). Higher resolution generally results in a clearer, more detailed image because it contains more pixels.
Definition Flip

What is 'colour depth' and how does it affect image quality?

Answer Flip

Colour depth, measured in bits, determines the number of colours a pixel can represent. Higher colour depth (

Example: 24-bit) allows for more colour variations, resulting in more realistic and vibrant images.
Definition Flip

What is a 'bitmap' image and how does it store image data?

Answer Flip

A bitmap is a raster graphic image file format that stores image data as a grid of pixels. Each pixel's color is individually stored, making bitmaps large files, especially for high resolutions and color depths.

Definition Flip

Explain the concept of 'sample rate' in digital audio.

Answer Flip

Sample rate refers to the number of audio samples taken per second when converting analog sound into digital data, measured in Hertz (Hz). A higher sample rate captures more audio information, resulting in better sound quality.

Definition Flip

Define 'bit depth' in the context of digital audio and its impact on audio quality.

Answer Flip

Bit depth (also known as audio resolution) refers to the number of bits used to represent each audio sample. A higher bit depth provides a greater dynamic range and lower noise, contributing to improved audio quality.

Key Concept Flip

Outline the factors that affect the file size of a digital image.

Answer Flip

The file size of a digital image is affected by resolution (number of pixels), colour depth (bits per pixel), and file format (

Example: bitmap vs. JPEG). Higher resolution and colour depth result in larger files.
Key Concept Flip

A digital audio file has a sample rate of 44.1 kHz and a bit depth of 16 bits. Explain what these values represent.

Answer Flip

A sample rate of 44.1 kHz means 44,100 audio samples are taken per second. A bit depth of 16 bits means each sample is represented using 16 bits, determining the dynamic range and accuracy of the audio.

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1.1 Number systems 1.3 Data storage and compression

Key Questions: Text, sound and images

Define the term 'ASCII' and provide an example of its use.

ASCII (American Standard Code for Information Interchange) is a character encoding standard for electronic communication. It represents text in computers, communication equipment, and other devices.

Example: the ASCII code for the letter 'A' is 65.
Explain the term 'pixel' in the context of digital images.

A pixel is the smallest addressable element in a raster image (bitmap). It represents a single point of color, and the combination of many pixels creates the overall image. Higher pixel count generally means more detail.

What is 'colour depth' and how does it affect image quality?

Colour depth, measured in bits, determines the number of colours a pixel can represent. Higher colour depth (

Example: 24-bit) allows for more colour variations, resulting in more realistic and vibrant images.
What is a 'bitmap' image and how does it store image data?

A bitmap is a raster graphic image file format that stores image data as a grid of pixels. Each pixel's color is individually stored, making bitmaps large files, especially for high resolutions and color depths.

Explain the concept of 'sample rate' in digital audio.

Sample rate refers to the number of audio samples taken per second when converting analog sound into digital data, measured in Hertz (Hz). A higher sample rate captures more audio information, resulting in better sound quality.

About Text, sound and images (1.2)

These 10 flashcards cover everything you need to know about Text, sound and images for your Cambridge IGCSE Computer Science (0478) exam. Each card is designed based on the official syllabus requirements.

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