synthio: add a noise program to the manual tests
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tests/circuitpython-manual/synthio/note/noise.py
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71
tests/circuitpython-manual/synthio/note/noise.py
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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 = 14700
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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,
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decay_time=0.2,
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sustain_level=0,
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)
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synth = synthio.Synthesizer(sample_rate=48000)
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def randf(lo, hi):
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return random.random() * (hi - lo) + lo
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def synthesize(synth):
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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=envelope,
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bend_mode=synthio.BendType.SWEEP,
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bend_depth=random.choice((-1, 1)),
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bend_rate=randf(4, 12),
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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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print(n, d)
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synth.press((n,))
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yield d
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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("noise.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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