Unit 1
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Why do computers use binary to represent data
Any form of data needs to be converted to binary to be processed by a computer
What system is Denary
a base 10 system
what system is Binary
binary is a base 2 system
what system is hexadecimal
hexadecimal is a base 16 system
why is hexadecimal used
its easier for humans to understand then binary since its a shorter representation
What is overflow
computers have a predefined limit that it can represent or store, overflow occurs when a value outside the limit should be returned
why is text converted to binary
so it can be read by the computer
why is Unicode used more than ASCII
it has a greater range of characters allowing for different languages but it requires more bits per character
How does a computer represent sounds
sound waves are sampled for sound to be converted to binary which is then processed
what is the sample rate
the number of samples taken per second
what is the sample resolution
the number of bits per sample
what happens when the sample rate and resolution increase in a recording
the accuracy of the recording increases but so does the file size
what is an image
a series of pixels that are converted to binary,which is then processed byu the computer
what is the resolution(images)
The number of pixels in the image
What is color depth
the number of bits used to represent each color
what happens when the resolution and color depth increase
the file size and the quality of the image increases
what is compression
when files are compressed
why is compression used
less bandwidth required less storage space required shorter transmission time
what is lossless compression
the file size is reduced without permanent loss of data
what is lossy compression
when the file size is reduced by permanently removing data(can reduce resolution, smaple rate,color depth
what is 2’s complement used for
128 is made negative so that negative values can also be used