ISE 582 Making Music (with MIDI) November 6, 2003 Arpi Mardirossian

2:10 Musical Instrument Digital Interface  Introduced in 1983  MIDI data is a very efficient method of representing musical performance information.  The MIDI protocol is an entire music description language in binary form.  MIDI files tend to be significantly smaller than audio files.  Each word describing an action of musical performance is assigned a specific binary code.

3:10 Musical Instrument Digital Interface  MIDI stores:  MIDI Messages (status bytes)  Timestamp for each message  Stores info about:  Tempo  Time and key signatures

4:10 Status ByteData BytesMessage 0x8nNOTE,VELNote Off 0x9nNOTE,VELNote On 0xAnNOTE,PRESUREKey Aftertouch 0xBnCTRL,VALUEControl Change … Musical Instrument Digital Interface Channel Voice Messages:

5:10 Using Java Packages  A package is a group of related Java classes.  Classes in the same package can access each other's protected members.  javax.sound.midi  Provides interfaces and classes for I/O, sequencing, and synthesis of MIDI (Musical Instrument Digital Interface) data.

6:10 Classes/Interaces in Package  Open Sequencer  Instantiate Sequence  Sequence contains the data  Create a track in the sequence  Each track represents one musical part  Create ‘messages’ to place in the track  Note On  Note Off  Instrument

7:10 Visualization ticks