This repository contains a simple audio synthesiser using numpy and PyAudio to play various waveforms.
Also included is a visualisation UI using pyqtgraph and PyQt5. Add together multiple sine waves with individually configureable frequency and volume, and see and hear the resulting waveform.
Make sure you have python 3.6 and pipenv installed.
Download or clone this repository, navigate inside and run:
pipenv install
Run the UI using:
pipenv run ui
Press the '+' button to add a new sinewave, use the text input or the slider to change the frequency and the dial to change the local volume. Press the '-' button next to a frequency selector to remove it.
To see some preset examples, try any of the following:
pipenv run ui full # show the full harmonic series
pipenv run ui odd # show the odd harmonic series
pipenv run ui square # show a square wave approximation
pipenv run ui triangle # show a triangle wave approximation
pipenv run ui sawtooth # show a sawtooth wave approximation
# the default fundamental of the above is 100Hz.
# combine any preset with a frequency to change this, e.g.
pipenv run square 250You can also use the synthesiser on its own, without the UI, as follows:
from synth import Synth
# Specify notes as a list of sinewave frequencies in Hz
notes = [100, 150, 250]
# Specify volumes for each note as a list between 0 and 1
volumes = [1, 0.75, 0.5]
update_rate = 1 # how many audio frames generated per second
# A high value will let the notes change more frequently,
# but might cause "popping" sounds for complex waveforms.
# A low value tends to have fewer "popping" sounds, but
# won't update to a new note as quickly
# initialise the synth with specific notes
synth = Synth(notes, volumes, update_hz=update_rate)
# start the continuous playback
synth.start()
# change the notes dynamically
input('Press Enter to change chord')
synth.notes = [150, 200, 350]
# control the main output volume scaling
synth.master_volume = 0.75
# prevent the application from terminating
input('Press Enter to end')
# close the audio thread and end the program
synth.stop()