text, sound & images Flashcards
what is a character set
defined list of characters recognised by a computer
how is each character represented
by a unique binary number
list character sets
ASCII, extended ASCII, Unicode
what is ASCII
a 7-bit character set with 128 characters
what is extended ASCII
an 8-bit character set with 256 characters
what is unicode
a 24-bit character set with over 16 million characters
what is sound file size
the total number of bits in a sound file
what is sample resolution
the number of bits store per second
what is sample rate
the number of samples stored per second
how to calculate sound file size
sample resolution * sample rate * length of sample
the higher the sample resolution
the greater the quality of the sound and the larger the file size
the higher the sample rate
the greater the quality of the sound and the larger the file size
how can images be stored
bitmaps or vectors
what are bitmap images
constructed from pixels
what are vector images
store the mathematics required to draw shapes
