Data storage Flashcards
1
Q
what is MIDI
A
Musical Instrument Digital Interface file
Stores a set of commands / instructions for how the sound should be played
does not store actual sounds
Specifies duration of the note
Specifies volume of the note
Specifies pitch of the note
Specifies instrument that plays the note
2
Q
explain mp3 music compression
A
Digital recording of sound
Produced by recording software / microphone
Used when distributing sound files
Compressed file format
90% smaller than the music files stored on a CD
uses lossy compression
size of file is reduced
3
Q
explain mp4 music compression
A
storage of multimedia like video can be streamed over the internet without losing any real noticeable quality. size of file is reduced uses lossy compression
4
Q
explain jpeg file compression
A
reduces quality of image/image resolution
size of file is reduced
uses lossy compression
5
Q
describe lossy compression
A
a compression algorithm is used data is permanently removed Discards any unnecessary sounds discards things humans cannot discard reduces more than lossless original file cannot be restored eg mp3, mp4, jpeg
6
Q
describe lossless compression
A
a compression algorithm is used no data is lost in the process repeated words/patterns can be indexed The indexed words/patterns can be replaced with numerical values size of file is reduced eg zip files
