Tsuyoshi TSUCHIMOTO / Mbed 2 deprecated Synthesizer

Wave Table Synthesizer(Occilator only). I will make Envelope Generator and MML for play music.

Dependencies:   mbed

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) from IC Clip or Breedboard.

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 7 waveforms.

  • OCC_NONE,
  • OCC_SQUARE,
  • OCC_SINE,
  • OCC_SAW,
  • OCC_WT,
  • OCC_NOISE,
  • OCC_TRIANGLE,

WT means WaveTable Synthesizer.Use "setWave()" function at first.Wavetable will copy in instance.

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 90(2016.Aug. in Tokyo).And these thing will be written in a Doujinshi.

Diff: Square.cpp

Revision:
5:3a753cf68fac
Parent:
4:2febde858269
--- a/Square.cpp	Sat Jan 30 09:52:44 2016 +0000
+++ b/Square.cpp	Tue Feb 02 18:42:49 2016 +0000
@@ -4,4 +4,17 @@
 
 Square::Square(long interrupt_us) :  Occilator(interrupt_us)
 {
+}
+
+unsigned long Square::tick()
+{
+    Occilator::tick();
+    if (m_Angle & 0x80000000)
+    {
+        return (0xffff*m_Volume) >> 16;
+    }
+    else
+    {
+        return 0;
+    }
 }
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