file formats Flashcards
what does MIDI stand for
musical instrument digital interface
what are MIDI files
they consists of lists of commands which instruct a device how to produce a sound/musical note
what are MP3 files
file compression system for music which doesn’t affect the quality of the sound
how do MP3 files use perceptual music shaping
they remove sounds that humans can’t hear and if two sounds are playing at the same time, the softer sound is removed
differences between MP3 and MIDI files
MP3 : digital recording of a sound
produced by recording software
compressed file format
MIDI: instructions of how to make a sound
non-audio recording
file is created by using musical instruments
produced by synthesizer
what is different about MP4 files to MP3 files
they can store multimedia formats other than music files
what are JPEG files used to store
they are used to store photographs as a reduced file size
how are images captured in JPEG files
- image is converted from analogue to digital
- image is turned into digits
- each pixel is turned into a binary value
- each pixel forms a color
- pixels form a grid
- pixels are stored in sequence
how are text stored as a file
ASCII format; use lossless file - repeated words can be indexed; can be saved as a zip file format
what is lossless file compression
all the data from the original files is reconstructed when the file is recompressed
what is lossy file compression
unnecessary data is eliminated forming a file that can’t be reconstructed to get back to the original file
when will original file of a lossless file compression not work
the code must be exactly the same as the original file
give an example of lossless file compression
computer program
what happens when you use lossy file compression
file size becomes smaller; quality can be reduced but the file will still run
give an example of a lossy file compression
MPEG (video file format)
