IT Flashcards
(27 cards)
Which standard came first?
ASCII
ASCII is the American Standard Code for Information Interchange, developed in the early 1960s.
How many bits does standard ASCII use?
7
Standard ASCII uses 7 bits to represent characters.
How many bits does extended ASCII use?
8
Extended ASCII uses 8 bits, allowing for additional characters beyond the standard ASCII set.
How many characters can extended ASCII represent?
256
Extended ASCII can represent 256 characters, including control characters and graphical symbols.
When transferring data, both computers need to use the same character set. True or False?
True
Consistent character sets are essential for accurate data interpretation between systems.
The same combination of 1’s and 0’s can be used to represent a number, letter, or the colour of a pixel on a screen. True or False?
True
Binary data representation allows for various types of information, including text, numbers, and colors.
Digital images are made up of elements called?
Pixels
Pixels are the smallest unit of a digital image, representing a single point in the image.
The more of these elements in an image improves the….?
Resolution
Resolution refers to the detail an image holds, which is enhanced by increasing the number of pixels.
Colour depth refers to the…..?
Amount of bits used to represent a picture element
Colour depth determines how many colors can be displayed in an image.
The more picture elements you have in an image the…..?
Bigger the file size
More pixels typically result in larger file sizes because of the increased data.
The bigger the colour depth the…..?
Bigger the file size
Higher colour depth requires more bits per pixel, leading to larger file sizes.
The number of representations of wave taken at regular intervals is called the?
Sample Rate
Sample Rate refers to the number of samples taken per second in digital audio.
The number of bits taken per a sample is called the?
Bit Resolution
Bit Resolution determines the precision of each sample in digital audio.
If you increase the sample rate you also?
Increase the file size
Higher sample rates capture more data, resulting in larger file sizes.
If you increase the Bit resolution you also?
Increase the quality
Higher bit resolution allows for more detailed sound representation.
If you increase the bit rate and the sample rate you?
Increase the quality and increase the file size
Both factors contribute to better audio quality but at the cost of larger files.
Lossy compression removes quality that can be put back. True or False?
False
Lossy compression permanently removes data, making it impossible to restore the original quality.
The number of pixels in an image is called …….?
Resolution
Resolution determines the detail an image holds.
If you increase the sample rate of a sound file you make the quality?
Better
A higher sample rate captures more audio detail.
If you increase the number of pixels in an image you.
Increase the file size
More pixels mean more data, leading to larger file sizes.
Colour depth refers to?
The number of colours that can represent a pixel
Higher colour depth allows for more accurate and varied colour representation.
We compress files so they cannot be read. True or False?
False
Compression is used to reduce file size while maintaining readability.
You can’t use lossless compression on data that contains words as you will lose some of the words. True or False?
False
Lossless compression allows for the original data to be perfectly reconstructed.
Run Length Encoding is a form of lossy compression? True or False
False
Run Length Encoding is a lossless compression technique.
