Created
October 26, 2021 08:06
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sounddeviceでリアルタイムにサイン波を出力
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import numpy as np | |
import sounddevice as sd | |
samplerate = 44100 | |
frequency = 440.0 | |
amplitude = 0.6 | |
sd.default.samplerate = samplerate | |
sd.default.device = 'MacBook Proのスピーカー' | |
start_idx = 0 | |
try: | |
# framesのブロック単位でsin波を出力 | |
# ブロック単位の処理なのでブロックをまたいでどこまで処理したかをstart_idxに記録しておく | |
def callback(outdata, frames, time, status): | |
global start_idx | |
# サンプル単位 | |
n = (start_idx + np.arange(frames)) | |
# (samples, channels) | |
n = n.reshape(-1, 1) | |
# サイン波は時間単位 t = n / samplerate にしてから生成 | |
outdata[:] = amplitude * np.sin(2.0 * np.pi * frequency * n / samplerate) | |
# 次のブロックの開始地点を移動 | |
start_idx += frames | |
with sd.OutputStream(callback=callback): | |
input() | |
except KeyboardInterrupt: | |
exit(1) |
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