ahiijny / SynthTest

Experimentation with audio synthesis.

SynthTest

Experimentation with audio synthesis.

NOTE

Most of the Arduino stuff in here doesn't work because the Arduino is not fast enough, and also because it doesn't have true analog output. Also, even if it did have true analog output, I'm not sure if piezos are sensitive enough to play sound samples at 256 different instensity levels.

======= C++: ========

1.0. ToneGenerator.dev:
Generates a wave file in the path "Audio/Tone.wav", consisting entirely of a single tone. Params: Sample rate: Duration (ms): for the entire wave file Frequency (Hz): Wave type: 0 = square, 1 = sine, 2 = sawtooth, other = random noise Lookup table resolution: preferably a power of 2 Amplitude: 0 to 127

2.0. WaveDegrader.dev: Reads a wave file, converts to mono channel, and outputs to "Audio/DegradedMono.wav". Params: File path: for the input file Target sample rate:

3.0. PiezoEmulatorExample.dev: (ARDUINO) Basically does the same thing as the CODE06 Arduino example (piezo elements), except this program outputs audio that would have been generated to "Audio/CODE06_Audio.wav".

4.0. PiezoEmulatorMoreNotes.dev: (ARDUINO) Same as [3], except replaces the "ccggaagffeeddc " etc. notes interpretation with midi note values, e.g. {60, 60, 67, 67, 69, 69, 67, 65, 65, 64, 64, 62, 62, 60, -1}.

5.0. PiezoEmulatorWaveForms.dev: (ARDUINO) Same as [4], except uses different possible wave forms, uses a waveform lookup table, and sets the value of the waveform state every sample instead of every time it changes; unlike in [4] and [3].

5.5. PiezoEmulatorToneGenerator.dev: (ARDUINO) Identical to [5] except that it only plays one note for an extended period of time.

6.0 PiezoEmulatorConcurrentTone.dev: (ARDUINO) Uses MIDI-like encoding with notes, delta time, and velocity to allow multiple notes to be played simultaneously. It has 3 channels. It plays a C, E, and G simultaneously.

6.5. PiezoEmulatorConcurrentNotes.dev: (ARDUINO) Identical to [6] except that it plays a sequence of notes instead of just a chord.

7.0 MidiWriter.dev Writes a .mid file based on commands invoked in the source code.

7.5 MidiInterpreter.dev Reads a .mid file, and prints information decoded from the binary data. Params: Midi path: for the input .mid file

======= Arduino: =======

1. [^3.0] CODE_06_Piezo_Elements.ino

2. [^4.0] More_Notes.ino

3. [----] Low_Pass_Filter_Tester.ino: Applies a constant 128 pulse width modulation so that a low-pass filter can be tested, to convert the PWM to an analog voltage (0-5V). Silence = successful.

4. [^5.0] Wave_Forms.ino

5. [^6.0] Concurrent_Tone.ino