Tsuyoshi TSUCHIMOTO / Mbed 2 deprecated Synthesizer

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Dependencies:   mbed

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Table of Contents

  1. At First
  2. Play
  3. Modify
  4. ToDo
  5. Project Goal Date

Project: Synthesizer. It is using embed to Chip Tune Synthesizer for NXP LPC1768.

At First

Prepare an amplifier with volume wheel. The amplifier wire at pin1 to pin18(D/A converter).

Play

Check out this project and deploy your mbed. And then push the reset key.

You hear a sound from amplifier.

Modify

First step, you can see main.cpp. This source file plays an occilator with "wait()". Modify frequency at 

#define ADD 0x2000000

on the top of source.

Occilator select 4 waveforms.

  • OCC_SQUARE
  • OCC_SAW
  • OCC_NOISE
  • OCC_SINE

Change there for waveform.

    gOccilator[0]=Occilator::getInstance(OCC_SAW,INTERRUPT_TIME_US);

INTERRUPT_TIME_US depends sampling rate. Don't change.

Total volume of D/A converter is setting this place.

        gOccilator[0]->setVolume(volume);

By the way, this sample output 0 to 1V(not3.3V) for deforming distortion.

ToDo

  • Envelope generator and LFO(with delay)
  • MML(Music Macro Language)
  • Sample Song(I will make a Japanese Anime music,perhaps)

Project Goal Date

I will make for Comic Market 91(2016.Aug. in Tokyo).And these thing will be written in a Doujinshi.

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