This slide describes toy software synthesizer. It is made by pure-python, and generates PSG like square-wave form sound from MML.

1. Pure Python
Software synthesizer
2011-06-11
Python mini Hack-a-thon #9
at gumi

2. Who are you?
Ransui Iso @ X-Listing.
I'm Common Lisper,
But use python heavily.

3. I like Chip-Tune Music very much.
Modern DTM system generates very rich sound,
but the system can't generate PIKO-PIKO
sound well.

4. So, I made
a toy software synthesizer
to generate PIKO-PIKO sound.

5. It generates PSG like
square-wave sound.
PSG is 'Programmable Sound Generator”,
which has been commonly use for
computer and game music
In 1980's

6. Square-wave form is good for PIKO-PIKO sound

7. Architecture of Synthesizer
Oscillator
Oscillator
MML
Mixer
Interpreter
Oscillator
Oscillator
Raw PCM
binary data

8. Music Macro Language
● Musical notation scores can translate to MML.
● Note : CDEFGAB and R
● + as #, - as ♭
● Musical Control
● Tempo T
● Volume V
● Octave O
● Default key on length L

9. How to generate MML to PCM data
MML String
Tokenizer Notation Generator
Sequence of Square Wave
Note instance Generator
RAW PCM
Binary data.

10. Splitted output module
Software Synthesizer FIFO Output Driver Software
PyQt
Qt Layer
QtMultimedia
OS Layer
ALSA DIrectSound Esound, etc...

11. Let's see the code!
You can find the python source code at pasetebin.
Raw PCM data generator : http://pastebin.com/h2fxLACS
Sound Output Program : http://pastebin.com/gf0SXULY

12. DEMO
Have you heard of this?

13. Thank you for LISTNING
Happy Hacking!!