text sound and images

A character set is a defined list of characters that can be understood by a computer, where each character is given a unique binary code.

ASCII (American Standard Code for Information Interchange) is a character set that uses 7 bits, allowing it to represent a maximum of 128 characters.

False. ASCII can only represent basic characters needed for English, limiting its use for other languages.

Extended ASCII is a character set that uses 8 bits, allowing it to represent a maximum of 256 characters.

UNICODE is a character set that uses a minimum of 16 bits, allowing it to represent a minimum of 65,536 characters from all major languages around the world.

A bit is a single binary digit, representing either a 0 or 1.

True. UNICODE uses more storage space than ASCII because it uses more bits to represent characters.

Character encoding refers to the process of assigning a unique binary code to each character in a character set.

True. A drawback of ASCII is that it cannot represent special characters such as emoji's (not enough bits)

Maximum number of characters = (to the power of the number of bits)

Sampling is the process of measuring and capturing values of an analogue signal at regular intervals.

An analogue signal is a continuous signal that can take on any value within a range, such as a sound wave.

True. Sound must be converted from analogue to digital form for a computer to process it.

Analogue to Digital conversion (A2D) is the process of converting an analogue signal, such as sound, into a digital form that a computer can understand.

Sample rate is the amount of samples taken per second of an analogue signal, measured in Hertz (Hz).

Sample resolution is the number of bits stored per sample of the sound.

True. Higher sample rate and bit depth result in better sound quality but larger file sizes.

Amplitude refers to the height of a sound wave.

True. The sample rate of a typical audio CD is 44.1 kHz (44,100 samples per second).

Digital refers to data represented as a series of discrete values, typically 0s and 1s in binary.

Duration is the length of time that something lasts, in the context of sound, it refers to the length of the recorded audio.

A bitmap is an image made up of squares called pixels, where each pixel is stored as a binary code.

A pixel is the smallest element of a bitmap image.

True. A vector image is created from mathematical equations and points.

Resolution is the total amount of pixels that make up a bitmap image, calculated by multiplying the height and width of the image (in pixels).

Colour depth is the number of bits stored per pixel in a bitmap image.

Maximum number of colours = (2 to the power colour depth) Example: Colour depth = 8, 28 = 256 colours

True. Higher resolution and colour depth result in larger file sizes.

Metadata is data about data, or additional information stored with an image but not required to display the image.

True Colour refers to a colour depth of 24 bits, allowing for 16,777,216 colours.

Pixel depth is another term for colour depth, referring to the number of bits used to represent the colour of each pixel.