20-11-2012, 04:02 PM
MIDI (Musical Instrument Digital Interface)
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MIDI
MIDI (Musical Instrument Digital Interface) is a standardized control language and hardware specification
allows suitably equipped electronic musical instruments and devices to communicate real-time and nonreal-time performance and control data
MIDI data is communicated digitally through a production system as a string of MIDI messages
MIDI Messages
The following is a typical 3 byte MIDI Note On message: (10010101) (01000000) (01011010)
This message is interpreted as follows.
The first byte is the status byte while the second and third are data bytes
The most significant bit of the byte determines which type of byte it is
The next three bits of the status byte code the Note On message
The four least significant bits give the channel to which this message is directed
In the case, channel #5. (Note that we can have up to 16 channels addressed through a single MIDI cable)
MIDI Channel Voice Messages
Channel voice messages are used to transmit real-time performance data throughout a connected MIDI system
There are seven channel voice messages:
Note On
Note Off
Polyphonic Key Pressure
Channel Pressure
Program Change
Control Change
Pitch Bend Change