File Types

Question 1

(MIDI)

Answer 1

Musical Instrument Digital Format

Question 2

What does MIDI do

Answer 2

• Store music files
• Communications protocal that allows electronic musical instruments to interact with each other
• Stored as a series as demands BUT NO ACTUAL NOTES
• Uses 8 bit serial transmission (Asynchronous)
• High memory storage

Question 3

Each MIDI command has a sequence of bytes

Answer 3

• First byte is the status byte- Informs the MIDI device what function to preform
• Encoded on the status byte is the MIDI channel (Operates on 16 different channels)

Question 4

Examples of MIDI commands

Answer 4

Note on and off: If a key has been pressed
Key pressure: Indicates how hard a key has been pressed (Volume)

Question 5

Define MP3

Answer 5

• Uses audio compression which reduces file size by 90%
• Uses perceptual music SHaoing which removes sounds humans cannot hear without affecting the quality too much
• CD files are converted using file compression software
• Uses lossy format

Question 6

Define MP4

Answer 6

• Storage of multimedia files
• Includes Music videos, photos and animation
• Videos can be streamned without losing too much quality

Question 7

(JPEG)

Answer 7

Joint Photographic Experts Group

Question 8

Define JPEG

Answer 8

• Reduce photographic file size
• Reduce picture resolution by changing the number of pixels per centimeter
• When undergoing compression, file size is reduced
• JPEG is reduce the raw bitmap image by a factor between 5 and 15