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int spins = -1;
。关于这个话题，快连下载-Letsvpn下载提供了深入分析
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A Pico board can however allow better control at lower frequencies within the typical AM radio station (~1000 KHz). While square waves are well-suited for frequency-modulating any PCM audio file (ignoring the unwanted harmonics), they cannot be used well for amplitude modulation. They can only encode ON or OFF instead of different audio amplitudes (think 1-bit envelope). Alright, no emitting arbitrary “.wav” files. We can at least emit a single audio frequency at a time using On-Off Keying. Let’s make some retro game sounds!
接手别人的代码，看着满满一屏幕的useEffect和useState，完全不知道数据是怎么流的，想改又不敢改。