Author Topic: Had trouble making a universal MIDI controller  (Read 121 times)

Offline Elijah_C

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Had trouble making a universal MIDI controller
« on: April 14, 2018, 12:25:03 PM »
Hello,

since i need ability to play any song on my DRSSTC, i decided to make universal MIDI controller.

Idea:
open song with Labview, convert it to spectrum , and use maximum energy frequency for PWM frequency. So PWM frequency will be calculated based on frequency, and compare register value (or duty cycle) will be based on power of that frequency.

I already developed my kynix FT2232D to SPI interface, that can send small packets at 5-7KHz repetition rate, so no wories here.

Sounds good ? Well, no, this approach works on well defined single tone song parts, but is complete mess for normal songs.
Any one have ideas?

Now I am even facing other few problems. If song only has one nice sharp tone, interrupter does reproduce that right. Problem arise as you stated from harmonics, since low frequency for humans will create less impression, and harmonics will have distortion that will degrade sound dramatically, but also one of main problems is that main beat or sound that will be asociated with that song does not always sit in highest power frequency  .

In other words, we care more in shades than in colors.

Last problem is even if i can send data from labview at 5-10kHz with all information for PWM circuit, song is played by chunks, and i get speed reduction down to 500Hz repetition rate...

This interrupter is only good if song is played in background, at this point humans will associate song sound with Tesla coil.
« Last Edit: April 16, 2018, 03:50:30 AM by Elijah_C »

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Had trouble making a universal MIDI controller
« on: April 14, 2018, 12:25:03 PM »

 


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