The prototype you see in the picture above is based on: the PCM2707C from Texas Instruments which takes care of the USB communication and outputs I2S audio data the PCM1794A, a 132dB SNR 24-bit ...
as the signals can be processed inside the headphones. That said, you can already pick up very good battery-powered noise-canceling headphones that sport a 3.5mm audio connector. So really, USB ...
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