Wave Table Synthesizer(Occilator only). I will make Envelope Generator and MML for play music.
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.
WT.cpp
- Committer:
- 117Florian
- Date:
- 2016-02-10
- Revision:
- 10:40bed7449a81
- Parent:
- 7:a478d5cc411e
File content as of revision 10:40bed7449a81:
#include "mbed.h" #include "global.h" #include "WT.h" WT::WT(long interrupt_us) : Occilator(interrupt_us) { //暫定実装 unsigned long src[]= { 0x7FFF, 0xB0FA, 0xDA80, 0xF63F, 0xFFFE, 0xF63F, 0xDA80, 0xB0FA, 0x7FFF, 0x4F03, 0x257D, 0x9BE, 0, 0x9BE, 0x257D, 0x4F03, }; setWave(src); } void WT::setWave(unsigned long wave[16]) { for (int i=0;i<16;i++) { m_Wave[i]=wave[i]; } } unsigned long WT::tick() { Occilator::tick(); myled3=1; return (m_Wave[(m_Angle >> 28) & 0xf]*m_Volume) >> 16; }