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Published byRussell Cunningham Modified over 6 years ago
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IV.3 Communication IV.3.1 (We Nov 01) MIDI
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instrumental- interface
MIDI = MusicalInstrumentDigitalInterface gestures l h e sound events instrumental- interface instrumentalize „thaw“ More precisely, performance is a transformation P from the symbolic reality of the score to the physical reality of sounds (a quarter note is not determined in its physical duration, only the metronome yields the relation between symbolic reality and physical reality). The mathematical analysis of tempo and pitch transformations shows that the performance transformation P can be described by a performance vector field, as shown to the left in the symbolic parameter space. Essentially, performance is calculated via integration of such performance vector fields, much as the time is calculated via integration of the tempo curve. In this language, performance operators are built in order to produce new performance fields from the old ones inherited from the relative mothers. Standard MIDI file score analysis
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31‘250 Bits per second ~ 1 MegaBit/32 per second (5mA) ~ 32 sec/Bit
IN THRU OUT three port types More precisely, performance is a transformation P from the symbolic reality of the score to the physical reality of sounds (a quarter note is not determined in its physical duration, only the metronome yields the relation between symbolic reality and physical reality). The mathematical analysis of tempo and pitch transformations shows that the performance transformation P can be described by a performance vector field, as shown to the left in the symbolic parameter space. Essentially, performance is calculated via integration of such performance vector fields, much as the time is calculated via integration of the tempo curve. In this language, performance operators are built in order to produce new performance fields from the old ones inherited from the relative mothers. (NAMM) National Association of Music Merchants convention 1983
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MIDI Specification: https://www.midi.org/
Expression Signification MIDI Specification: More precisely, performance is a transformation P from the symbolic reality of the score to the physical reality of sounds (a quarter note is not determined in its physical duration, only the metronome yields the relation between symbolic reality and physical reality). The mathematical analysis of tempo and pitch transformations shows that the performance transformation P can be described by a performance vector field, as shown to the left in the symbolic parameter space. Essentially, performance is calculated via integration of such performance vector fields, much as the time is calculated via integration of the tempo curve. In this language, performance operators are built in order to produce new performance fields from the old ones inherited from the relative mothers. Content Message Hierarchy
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MIDI Message Syntax What? Who? How? 10 Bit Words: 320 sec/word
Statusbyte 1st Databyte 2nd Databyte Stastusbit Databit Note-On Message Channel (5) Note Number (60) Velocity (61) 10 Bit Words: 320 sec/word Startbit = 0 Stoptbit = 0
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MIDI Message Hierarchy
System single musicians all musicians the entire system
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MIDI Channel Voice Statusbyte Databyte Message Description Statusbyte
1st Databyte 2nd Databyte Stastusbit Databit Note-On Message Channel (5) Note Number (60) Velocity (61)
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Standard MIDI File ............................ Statusbyte
Delta Time in Ticks = 480 per quarter note Off of first note and On of second note Statusbyte 1st Databyte 2nd Databyte Stastusbit Databit Note-On Message Channel (5) Note Number (60) Velocity (61)
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