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https://bravikov.wordpress.com/2016/10/11/%d1%87%d0%b0%d1%81%d1%82%d0%be%d1%82%d0%b0-%d1%81%d1%80%d0%b5%d0%b7%d0%b0-%d0%b8-%d1%87%d0%b0%d1%81%d1%82%d0%be%d1%82%d0%b0-%d1%81%d0%be%d0%bf%d1%80%d1%8f%d0%b6%d0%b5%d0%bd%d0%b8%d1%8f/
Частота среза и частота сопряжения