| I found a good document describing knock detection from TI website (La-Z-Link). I did my thesis work including spectral analysis SW (also digital filtering etc) with ditital signal processors and so I have some technical background in these areas. My guess for not implementing knock detection in high RPMs is that there were not enough affordable computing power and maybe ADCs were not good enough either. As mentioned in pdf, lack of signal processing power was keeping more sophisticated knock detection procedures only in RD use. I don't know HW specifications for Z32 ECU other than is uses 8-bit CPU. So calculation power was just not there. Maybe this is what they mean when they say that the technology was not there. Current digital signal prosessor or MCU's operate at several hundred MHz with (mostly) 32-bit arithmetic so calculation power for example with J&S style detectors is huge compared to old Z32 ecu.
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