67 lines
1.4 KiB
Python
67 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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random.seed(9)
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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(
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attack_time=0.1, decay_time=0.05, release_time=0.2, attack_level=0.8, sustain_level=0.8
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)
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synth = synthio.Synthesizer(sample_rate=48000)
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bend_out = np.linspace(0, 32767, num=SAMPLE_SIZE, endpoint=True, dtype=np.int16)
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def synthesize(synth):
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n = synthio.Note(
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frequency=440,
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waveform=sine,
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ring_waveform=sine,
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ring_frequency=769,
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envelope=envelope,
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bend=synthio.LFO(bend_out, scale=50 / 1200, rate=7),
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)
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print(synth, n)
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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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n.ring_frequency = 0
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print(synth, n)
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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("ring.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)):
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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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