Music - MIDI Physical Level

/---------shield---------------------\

/----------wire1---------------------\| |

| /--------wire2-----------------------\ ||

/------\ /------\ ||| |||

| 2 | max length 50ft | 2 |

| 5 4 | | 5 4 |

|o o | |o o |

\------/ \------/

midi out midi in

5-pin DIN plug

leave earth connected at

midi out only

Asynchronous:

1 start bit

8 data bits

1 stop bit

Baud rate: 31,250 Baud (+ 1%) _

(320 ms per serial byte)

Electrical interface level

5mA current loop

[Ref 1] Computing magazine March 90.

Our system of music has evolved according to what sounds pleasant to the human ear, sounds need to be complex enough to be interesting but not so complex that they appear dischordent. The most simple element of sound is a pure sine wave, this is because the ear contains fibres tuned to various frequencies of sine wave.

A sine wave has two characteristics:

Most real sounds, such as the sound produced by a vibrating string or air column produce a more complex waveform made up of a sine wave plus a number of harmonics of that frequency.

The frequency of musical sounds is perceived by the human ear on a logarithmic scale. Each time the frequency is doubled the interval increases by an octave.

A triad consist of a bass note plus a third and a fifth this contains all the harmonics upto 20.

 


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