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Knock Frequency filtters explanation

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Hello guys. 

I have a question about Knock frequency filters.

If our frequency centered according to spectrogram at let's say 9.7 khz or something like that. 

We must choose 10khz at software because it's closer to 9.7khz?

Or if we choose 10khz the Ecu sees only 10khz-10.99khz. At 9khz 9-9.99khz etc? 

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