1.2.4 Data Storage Flashcards
(20 cards)
What does binary shift do?
Binary shifts multiply or divide a binary number by 2
What is an overflow error?
Occurs when a computer program or system tries to store more data in a fixed-size location than it can handle, resulting in data loss or corruption.
What does ASCII stand for?
American Standard Code for Information Interchange
How many bits is ASCII?
8 bits
How much storage does it take to store one character?
1 byte per character
What is a character set?
A collection of characters that a computer system recognises and uses to represent text.
What is unicode?
- A very popular 2 byte (16 bit) encoding standard
- Can represent between 65536 characters and over 4 billion
What is a bitmap image?
A bitmap image file represents an image as a series of pixels.
What does each pixel have?
A colour, represented by a specific code
What is the colour depth of an image?
The number of bits per pixel used to represent a colour is called colour depth.
What is resolution?
Image resolution is the number of pixels per inch. The higher the number of pixels (dpi) the greater the resolution.
Higher resolution makes a higher quality image
What is metadata?
Metadata is the information that is stored about each image.
Give examples of metadata.
- Width in pixels
- Height in pixels
- Horizontal resolution in dpi
- Vertical resolution in dpi
- Colour (bit) depth
What is sound measured in?
Measured in ‘cycles per second’ or ‘Hertz’. This is the frequency of sound. The higher the frequency, the higher-pitched it sounds.
What is sampling?
Sampling is a method of converting an analogue sound signal into a set of binary numbers that are then stored in a digital file.
What is duration?
How many seconds of audio the sound file contains
What is bit depth?
Number of bits available to store each sample
What is sample rate?
This is the rate at which samples are taken
How do you find bit rate?
sample rate x bit depth x number of channels
Examples of metadata in sound?
Sample rate
Bit rate
Duration
Codec
