59 lines
1.4 KiB
Python
59 lines
1.4 KiB
Python
import sys
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sys.path.insert(
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0, f"{__file__.rpartition('/')[0] or '.'}/../../../../frozen/Adafruit_CircuitPython_Wave"
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)
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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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SAMPLE_SIZE = 1024
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VOLUME = 32767
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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(attack_time=0.05, decay_time=8, release_time=0.25, sustain_level=0)
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fast_decay_envelope = synthio.Envelope(
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attack_time=0.05, decay_time=0.25, release_time=0.25, sustain_level=0
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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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notes = (synthio.Note(frequency=440, waveform=sine, envelope=envelope),)
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synth.press(notes)
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yield 360
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notes[0].envelope = fast_decay_envelope
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yield 180
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synth.release_all()
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def synthesize2(synth):
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notes = (synthio.Note(frequency=440, waveform=sine, envelope=envelope),)
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synth.press(notes)
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yield 360
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synth.release_all()
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yield 180
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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("envelope.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(synthesize(synth), synthesize2(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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