https://blog.k3170makan.com/2018/09/introduction-to-elf-format-elf-header.html
And when you want to avoid lossy Bluetooth, the Muo’s USB-C port can also carry audio. Plug it into a computer (or portable media player), hold and press a couple of buttons, and it works as a 24-bit/48 kHz external speaker (depending on compatibility). There is no 3.5 mm aux input, but the USB-C digital connection covers most use cases.，更多细节参见电影
。PDF资料对此有专业解读
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AirPods 4 with Active Noise Cancellation，这一点在体育直播中也有详细论述