Tsuyoshi TSUCHIMOTO
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.
Diff: Occilator.h
- Revision:
- 3:32094530d55e
- Child:
- 4:2febde858269
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Occilator.h Sat Jan 30 09:26:02 2016 +0000
@@ -0,0 +1,46 @@
+#ifndef _OCCILATOR_H_INCL
+#define _OCCILATOR_H_INCL
+
+#define OCCILATOR_PART_NUM 64
+
+class Occilator
+{
+ public:
+ /**
+ * Constructor(only)
+ * to construct after mbed has started.
+ * this constructor handles interval timer automatically.
+ * @value interrupt_us interrupt span (micro second). it work at first time only.
+ */
+ Occilator(long interrupt_us);
+
+ /**
+ * Destructor
+ * this destructor anatach the interval timer automatically.
+ */
+ ~Occilator();
+
+ /**
+ * Set angle speed(0x100000000 per 1 round)
+ * frequency is depend on interrupt_us
+ */
+ void setOmega(long speed);
+
+ /**
+ * Set volume(0x10000 max volume)
+ * @param volume
+ */
+ void setVolume(int volume);
+
+ /**
+ * advance the Angle and caliculate value this span.
+ * it was called by automatically from interval timer.
+ * @return value on this tick(max 0xffff0000)
+ */
+ virtual unsigned long tick();
+
+ long m_Angle;
+ long m_Omega;
+ int m_Volume;
+};
+#endif
\ No newline at end of file