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https://github.com/cedargrovestudios/circuitpython_wavebuilder

A CircuitPython class to construct a composite synthio wave table from a collection of oscillators.
https://github.com/cedargrovestudios/circuitpython_wavebuilder

arbitrary-waveform-generator circuitpython circuitpython-community-bundle synthio wave-table waveform-generator waveform-synthesiser

Last synced: about 2 months ago
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A CircuitPython class to construct a composite synthio wave table from a collection of oscillators.

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README 

        
Introduction

------------



.. image:: https://img.shields.io/discord/327254708534116352.svg

    :target: https://adafru.it/discord

    :alt: Discord



.. image:: https://github.com/CedarGroveStudios/CircuitPython_Chime/workflows/Build%20CI/badge.svg

    :target: https://github.com/CedarGroveStudios/CircuitPython_Chime/actions

    :alt: Build Status



.. image:: https://img.shields.io/badge/code%20style-black-000000.svg

    :target: https://github.com/psf/black

    :alt: Code Style: Black



A CircuitPython class to construct a composite ``synthio`` wave table

from a collection of oscillators. The table is created from a list

of oscillator characteristics, sample length, maximum sample

value, a lambda factor, and loop smoothing parameters.



Dependencies

------------

This class depends on:



* `Adafruit CircuitPython `_



Please ensure all dependencies are available on the CircuitPython filesystem.

This is easily achieved by downloading

`the Adafruit library and driver bundle `_

or individual libraries can be installed using

`circup `_.



Installing to a Connected CircuitPython Device with Circup

----------------------------------------------------------



Make sure that you have ``circup`` installed in your Python environment.

Install it with the following command if necessary:



.. code-block:: shell



    pip3 install circup



With ``circup`` installed and your CircuitPython device connected use the

following command to install:



.. code-block:: shell



    circup install cedargrove_wavebuilder



Or the following command to update an existing version:



.. code-block:: shell



    circup update



Usage Example

-------------



.. code-block:: python



    # SPDX-FileCopyrightText: Copyright (c) 2023 JG for Cedar Grove Maker Studios

    # SPDX-License-Identifier: MIT



    import time

    import board

    import synthio

    import audiobusio

    import audiomixer

    from cedargrove_wavebuilder import WaveBuilder, WaveShape



    # Define synth parameters

    SAMPLE_RATE = 22050  # The sample rate in SPS

    WAVE_TABLE_LENGTH = 512  # The wave table length in samples

    SAMPLE_MAXIMUM = 32700  # The maximum value of a sample



    # Define the oscillator wave shape, overtone ratio, and amplitude

    tone = [(WaveShape.Sine, 1.0, 0.6)]



    # Create the wave table and show the debug messages

    wave = WaveBuilder(

        oscillators=tone,

        table_length=WAVE_TABLE_LENGTH,

        sample_max=SAMPLE_MAXIMUM,

        lambda_factor=1.0,

        loop_smoothing=True,

        debug=True,

    )



    # Define the tone's ADSR envelope parameters

    tone_envelope = synthio.Envelope(

        attack_time=0.02 + 0.01,

        attack_level=1.0 * 1.0,

        decay_time=0.0,

        release_time=2.0,

        sustain_level=1.0,

    )



    # Configure synthesizer for I2S output on a Feather S2

    audio_output = audiobusio.I2SOut(

        bit_clock=board.D12, word_select=board.D9, data=board.D6, left_justified=False

    )

    mixer = audiomixer.Mixer(

        sample_rate=SAMPLE_RATE, buffer_size=4096, voice_count=1, channel_count=1

    )

    audio_output.play(mixer)

    mixer.voice[0].level = 0.50



    synth = synthio.Synthesizer(sample_rate=SAMPLE_RATE)

    mixer.play(synth)



    note_1 = synthio.Note(880, envelope=tone_envelope, waveform=wave.wave_table)



    while True:

        # Set the note waveform to sine and play the note

        wave.oscillators = [(WaveShape.Sine, 1.0, 0.6)]

        note_1.waveform = wave.wave_table

        synth.press(note_1)

        synth.release(note_1)

        time.sleep(1)



        # Set the note waveform to square and play the note

        wave.oscillators = [(WaveShape.Saw, 1.0, 0.6)]

        note_1.waveform = wave.wave_table

        synth.press(note_1)

        synth.release(note_1)

        time.sleep(1)



Documentation

-------------

API documentation for this library can be found in `Cedargrove_WaveBuilder `_.



.. image:: https://github.com/CedarGroveStudios/CircuitPython_WaveBuilder/blob/main/media/wavebuilder_api_page1a.png



.. image:: https://github.com/CedarGroveStudios/CircuitPython_WaveBuilder/blob/main/media/wavebuilder_api_page2a.png



For additional detail about ``WaveBuilder``, see `Construct a synthio Waveform Object from a List of Oscillators `_



Attribution: Patch Symbols from PATCH & TWEAK by Kim Bjørn and Chris Meyer, published by Bjooks, are licensed under Creative Commons CC BY-ND 4.0.

Some Patch Symbols were modified to create the synthio symbols ``BlockInput``, ``MixerVoice``, ``Note``, ``Synthesizer``, ``sample``, and ``voice``.



Planned Updates

---------------

* Add wave table file saving.

* Open external file as the fundamental wave table.

* Include other preset wave types.

* Add examples for filtering and applying ``synthio.Math`` to wave tables.



Acknowledgements and Thanks

---------------------------

* Liz Clark, '`Circle of Fifths Euclidean Synth with synthio and CircuitPython`' Adafruit Learning Guide

  for the waveform and noise examples.

* Todd Kurt for essential ``synthio`` hints, tricks, and examples

  (https://github.com/todbot/circuitpython-synthio-tricks).

* Special thanks to Jeff Epler and Adafruit for the comprehensive design and implementation

  of the CircuitPython ``synthio`` module.