a7da245ad0
This class allows much more expressive sound synthesis: * tremolo & vibrato * arbitrary frequency * different evelope & waveform per note * all properties dynamically settable from Python code
101 lines
2.3 KiB
Python
101 lines
2.3 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 wave
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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,
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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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synth = synthio.Synthesizer(sample_rate=48000)
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def synthesize(synth):
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random.seed(3)
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target_notes = [synthio.midi_to_hz(n + o) for n in (60, 64, 67, 70) for o in (-12, 12, 0)]
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print(target_notes)
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notes = [
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synthio.Note(frequency=random.randint(60, 20000), waveform=sine, envelope=envelope)
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for note in target_notes
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]
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synth.press(notes)
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target = synthio.midi_to_hz(72)
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factor = 0.98
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for i in range(600):
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yield 1
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for ni, ti in zip(notes, target_notes):
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print(ni.frequency, ti)
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break
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for ni, ti in zip(notes, target_notes):
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ni.frequency = (ni.frequency * factor) + (ti * (1 - factor))
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synth.release_all()
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yield 36
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def synthesize2(synth):
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n = synthio.Note(
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frequency=synthio.midi_to_hz(60),
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tremolo_depth=0.2,
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tremolo_rate=2,
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waveform=sine,
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envelope=envelope,
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)
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synth.press((n,))
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yield 360
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synth.release_all()
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yield 36
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def synthesize3(synth):
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n = synthio.Note(
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frequency=synthio.midi_to_hz(60),
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vibrato_depth=0.1,
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vibrato_rate=8,
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waveform=sine,
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envelope=envelope,
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)
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synth.press((n,))
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yield 360
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synth.release_all()
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yield 36
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def synthesize4(synth):
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n = synthio.Note(
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frequency=synthio.midi_to_hz(60),
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tremolo_depth=0.1,
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tremolo_rate=1.5,
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vibrato_depth=0.1,
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vibrato_rate=3,
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waveform=sine,
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envelope=envelope,
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)
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synth.press((n,))
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yield 720
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synth.release_all()
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yield 36
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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("tune-noenv.wav", "w") as f:
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f.setnchannels(1)
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f.setsampwidth(2)
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f.setframerate(48000)
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for n in chain(synthesize2(synth), synthesize3(synth), synthesize4(synth)):
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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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