283 lines
6.8 KiB
Python
283 lines
6.8 KiB
Python
import random
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import audiocore
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import synthio
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from ulab import numpy as np
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import adafruit_wave as wave
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h = np.array(
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[
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-0.001229734800309099,
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-0.008235561806605458,
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-0.015082497016061390,
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-0.020940136918319988,
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-0.024981800822463429,
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-0.026464233332370746,
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-0.024803890156806906,
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-0.019642276775473012,
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-0.010893620860173042,
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0.001230341899766145,
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0.016221637398855598,
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0.033304135659230648,
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0.051486665261155681,
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0.069636961761409016,
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0.086570197432542767,
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0.101144354207918147,
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0.112353938422488253,
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0.119413577288191297,
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0.121823886314051028,
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0.119413577288191297,
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0.112353938422488253,
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0.101144354207918147,
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0.086570197432542767,
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0.069636961761409016,
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0.051486665261155681,
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0.033304135659230648,
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0.016221637398855598,
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0.001230341899766145,
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-0.010893620860173042,
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-0.019642276775473012,
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-0.024803890156806906,
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-0.026464233332370746,
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-0.024981800822463429,
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-0.020940136918319988,
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-0.015082497016061390,
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-0.008235561806605458,
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-0.001229734800309099,
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]
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)
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filter_coeffs = np.array(h[::-1] * 32768, dtype=np.int16)
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def randf(lo, hi):
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return random.random() * (hi - lo) + lo
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SAMPLE_SIZE = 1024
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VOLUME = 14700
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sine = np.array(
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np.sin(np.linspace(0, 2 * np.pi, SAMPLE_SIZE, endpoint=False)) * VOLUME, dtype=np.int16
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)
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square = np.array([24000] * (SAMPLE_SIZE // 2) + [-24000] * (SAMPLE_SIZE // 2), dtype=np.int16)
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noise = np.array(
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[random.randint(-32768, 32767) for i in range(SAMPLE_SIZE)],
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dtype=np.int16,
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)
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envelope = synthio.Envelope(
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attack_time=0.1, decay_time=0.05, release_time=0.2, attack_level=1, sustain_level=0.8
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)
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instant = synthio.Envelope(
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attack_time=0, decay_time=0, release_time=0, attack_level=1, sustain_level=1
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)
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synth = synthio.Synthesizer(
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sample_rate=48000, envelope=None, filter=filter_coeffs, channel_count=2
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)
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def synthesize(synth):
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print(
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"""you can use arbitrary waveforms, including ones calculated on the fly or read from wave files (up to 1024 points)"""
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)
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waveform = np.zeros(SAMPLE_SIZE, dtype=np.int16)
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chord = [
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synthio.Note(synthio.midi_to_hz(n), waveform=waveform, envelope=envelope)
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for n in (60, 64, 67, 70)
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]
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synth.press(chord)
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for i in range(256):
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ctrl = i / 255
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waveform[:] = np.array(square * (1 - ctrl) + sine * ctrl, dtype=np.int16)
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yield 4
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def synthesize2(synth):
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print("""Envelope controls how notes fade in or out""")
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chord = [
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synthio.Note(synthio.midi_to_hz(n), waveform=sine, envelope=instant)
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for n in (60, 64, 67, 70)
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]
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for i in range(4):
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for c in chord:
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synth.release_all_then_press((c,))
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yield 24
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synth.release_all()
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chord = [
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synthio.Note(synthio.midi_to_hz(n), waveform=sine, envelope=envelope)
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for n in (60, 64, 67, 70)
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]
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for i in range(4):
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for c in chord:
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old = (c,)
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synth.release_all_then_press((c,))
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yield 24
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def synthesize3(synth):
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print("""A noise waveform creates percussive sounds""")
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env = synthio.Envelope(
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attack_time=0,
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decay_time=0.2,
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sustain_level=0,
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)
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notes = [
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synthio.Note(
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frequency=synthio.midi_to_hz(1 + i),
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waveform=noise,
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envelope=env,
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)
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for i in range(12)
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]
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random.seed(9)
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for _ in range(16):
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n = random.choice(notes)
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d = random.randint(30, 60)
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synth.press((n,))
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yield d
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def synthesize4(synth):
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print("""Tremolo varies the note volume within a range at a low frequency""")
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chord = [
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synthio.Note(synthio.midi_to_hz(n), waveform=sine, envelope=None) for n in (60, 64, 67, 70)
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]
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synth.press(chord)
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for i in range(16):
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for c in chord:
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c.tremolo_depth = i / 50
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c.tremolo_rate = (i + 1) / 4
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yield 48
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yield 36
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def synthesize5(synth):
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print("""You can add vibrato or frequency sweep to notes""")
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chord = [synthio.Note(synthio.midi_to_hz(n), waveform=sine) for n in (60, 64, 67, 70)]
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synth.press(chord)
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for i in range(16):
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for c in chord:
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c.bend_depth = 1 / 24
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c.bend_rate = (i + 1) / 2
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yield 24
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synth.release_all()
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yield 100
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for c in chord:
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synth.release_all()
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c.bend_mode = synthio.BendMode.SWEEP_IN
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c.bend_depth = randf(-1, 1)
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c.bend_rate = 1 / 2
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synth.press(chord)
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yield 320
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def synthesize6(synth):
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print("""Ring modulation multiplies two waveforms together to create rich sounds""")
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chord = [
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synthio.Note(synthio.midi_to_hz(n), waveform=square, ring_waveform=sine, envelope=envelope)
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for n in (60,)
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]
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synth.press(chord)
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yield 200
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random.seed(75)
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for _ in range(3):
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synth.release_all()
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yield 36
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for note in chord:
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note.ring_frequency = note.frequency * (random.random() * 35 / 1200 + 8)
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synth.press(chord)
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yield 200
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def synthesize7(synth):
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print("""FIR filtering can reproduce low, high, notch and band filters""")
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chord = [
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synthio.Note(synthio.midi_to_hz(n), waveform=square, filter=False)
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for n in (60, 64, 67, 70)
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]
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for i in range(4):
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for c in chord:
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synth.release_all_then_press((c,))
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yield 24
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synth.release_all()
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for note in chord:
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note.filter = True
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for i in range(4):
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for c in chord:
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synth.release_all_then_press((c,))
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yield 24
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def synthesize8(synth):
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print("""Notes can be panned between channels""")
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chord = [
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synthio.Note(synthio.midi_to_hz(n), waveform=square, envelope=envelope)
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for n in (60, 64, 67, 70)
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]
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synth.press(chord)
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for p in range(-10, 11, 1):
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for note in chord:
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note.panning = p / 10
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yield 36
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def delay(synth):
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synth.release_all()
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yield 200
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def chain(*args):
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for a in args:
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yield from a
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# sox -r 48000 -e signed -b 16 -c 1 tune.raw tune.wav
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with wave.open("demo.wav", "w") as f:
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f.setnchannels(2)
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f.setsampwidth(2)
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f.setframerate(48000)
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import array
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for n in chain(
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synthesize(synth),
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delay(synth),
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synthesize2(synth),
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delay(synth),
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synthesize3(synth),
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delay(synth),
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synthesize4(synth),
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delay(synth),
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synthesize5(synth),
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delay(synth),
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synthesize6(synth),
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delay(synth),
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synthesize7(synth),
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delay(synth),
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synthesize8(synth),
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):
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for i in range(n):
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result, data = audiocore.get_buffer(synth)
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f.writeframes(data)
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