1. Information representation Flashcards
What is a byte?
A group of 8 bits.
What is Binary coded decimal (BCD)?
Representation of integers or float numbers by their digits encoded with binary
What is Vectors graphics?
Computer Images created by a sequence of commands that place lines and shapes in a 2D / 3D space
What is a Drawing list?
List of commands for every drawing object, where every command has its own attributes and each attribute defines a property of an object.
What is a Drawing object?
Each component of image made with vector graphics.
What is Color depth and Bit depth?
Color depth - number of bits per pixel, eg. color depth of 8 bits per pixel.
Bit depth - number of bits used to store each of red, green and blue, eg. bit depth of 8 bits per primary colors results in color depth of 24 bits.
What is File header?
It contains extra information about the vector graphics image on how graphics have been constructor, eg. bit/color depth, file size, resolution, colors etc.
What is Sound encoder?
It gets sound values as an input and outputs values as binary encoded data.
What does sound encoding components: Band-limiting filter and Analogue-to-digital converter (ADC) do?
Band-limiting filter - filters high frequency waves
Analogue-to-digital converted - converts analogue data to digital, binary encoded, data.
What does ADC sampling, Sampling resolution and Sampling rate mean?
ADC sampling - taking data at regular intervals.
Sampling resolution - number of bits that will be used to store amplitude values.
Sampling rate - number of samples taken per second.
What does Lossless compression and Lossy compression mean? Give examples with explanations for each of them.
Lossless compression - after a file is compressed, information is not lost, eg. Run-length encoding: the sequence of repeating bits are stored as the number of times it repeated before the single data value.
Lossy compression - after a file is compressed, information is lost, eg. reduced resolution / color depth / bit depth
