esp32没有DAC通道，没关系

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https://atomic14.com/2024/01/05/esp32-s3-no-pins.html

So, there’s no DAC on the ESP32-S3.

You would think this would be a bit of a downer if if you want to get audio out and use an analog amplifier.

But it’s actually surprisingly easy to output Pulse Density Modulated audio using Sigma Delta Modulation on the ESP32 and you can recover the audio signal by low pass filtering it - an RC filter can be sufficient for this. And that’s what I’m using in the video.

利用脉冲密度调制把数字音频解码为模拟信号，再用硬件做低通滤波，