PySchaeffer

Introduction

PySchaeffer provides a set of Python 3 functions for sound generation.

In order to Keep It as Simple and Stupid as possible :

• No library is needed.
• No real time.
• Sampling rate is fixed to 44100Hz.
• No stereo

Conventions

• All durations are in ms.
• Sounds are represented by Python lists of float numbers (between -1.0 and 1.0)

Functions

Generators

• Silence, white noise, sine, PWM
• Additive synthesis
• Frequency Modulation : phasor, sine, wavetable
• Karplus-Strong, DTMF, Morse code

Effects

• Amplification, shift, normalisation, envelope, ADSR
• IIR Filters, including designs for Bandpass, Hi/Lo-pass, Hi-Lo-shelf
• Freeverb and associated filters (filtered feedback comb filters, ...)
• Convolution : naive and fast (FFT based)
• Variable (interpolated) delay, Speed change

Analysis

• Discrete Cosine Transform
• Fast Fourier Transform (and inverse)
• Filter frequency response
• Envelope detector

Speech

• Formant filters (presets).
• Basic Text-to-Speech using diphones.

I/O

• MIDI input
• WAV input/output