[sdiy] Fwd: real time FM synthesizer
dmarv at dop.com
Wed Apr 13 03:26:57 CEST 2016
This is a cross post from the python (programming language) list.
Thought some might enjoy it.
-------- Forwarded Message --------
Subject: real time FM synthesizer
Date: Wed, 13 Apr 2016 01:22:15 +0200
From: Irmen de Jong <irmen.NOSPAM at xs4all.nl>
To: python-list at python.org
It seems that Python is fast enough  to create a real time FM music
synthesizer (think Yamaha DX-7). I made one that you can see here:
The synthesizer can create various waveforms (sine, sawtooth, pulse
etc.) and lets you modify them in various ways. You can apply FM
(frequency modulation), PWM (pulse-widthmodulation), volume envelopes,
vibrato, and reverb/echo. It is primarily based around
oscillators that are represented as generator functions in the code.
A GUI is provided that gives access to most of the features
interactively, and lets you play a tune with your created FM instrument
on a piano keyboard.
You will need Python 3.x and pyaudio to be able to hear sound, and
matplotlib if you want to see graphical diagrams of generated waveforms.
I can't create nice music myself but this was a fun project to build and
to learn how FM synthesizers work internally :)
: meaning it can generate and play fairly complex waveforms based on
multiple oscillators and filters in real time in one 44.1 kHz audio
channel. That is on a 3.2 ghz machine. With enough oscillator/filters
combined however it starts to stutter and cannot do it anymore in real
time. However you can still generate those waveforms and save them to a
.wav on disk to play afterwards. The code only uses one CPU core though
so maybe there's room for improvement.
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