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Musical Instrument Digital Interface

(MIDI)

MIDI interface is developed by Diver Smith of sequential circuits, inc in 1982. It
is an universal synthesizer interface

MIDI Specification 1.0

MIDI is a system specification consisting of both hardware and software
opponents which define inter-coactivity and a communication protocol for
electronic synthesizers, sequences, rhythm machines, personal computers, and
other electronic musical instruments. The inter-connectivity defines the standard
cabling scheme, connector type and input/output circuitry which enable these
different MIDI instruments to be interconnected. The communication protocol
defines standard multibyte messages that allow controlling the instrument’s voice
and messages including to send response, to send status and to send exclusive.

MIDI Hardware Specification

The MIDI. hardware specification require five pin panel mount requires five pin
panel mount receptacle DIN connectors for MIDI IN, MIDI OUT and MIDI
THRU signals. The MIDI IN connector is for input signals The MIDI OUT is for
output signals MIDI THRU connector is for daisy-chaining multiple MIDI
instruments.

MIDI Interconnections

The MIDI IN port of an instrument receives MIDI massages to play the
instrument's internal synthesizer. The MIDI OUT port sends MIDI messages to
play these messages to an external synthesizer. The MIDI THRU port outputs
MIDI messages received by the MIDI IN port for daisy-chaining external
synthesizers.

Communication Protocol

The MIDI communication protocol uses multibyte messages; There are two types
of messages:
(i) Channel messages
(ii) System messages.