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This is how S/PDIF to TTL converter usually looks like. I simulated poor quality smoothed out signal with a sine wave.

enter image description here

enter image description here

Can comeone explain how it really works? Inverter with feedback resistor confuses me a bit. My intuitive approach would be to use a voltage divider to bias inverter's input to it's threshold point. On the schematic above it becomes properly biased automatically.

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R1 provides hysteresis to the comparator so that it will not "dither" when the voltage is close to the threshold.

https://en.wikipedia.org/wiki/Comparator#Hysteresis

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