Dobrý den, měl bych technický dotaz - proč se uvádí frekvence 40kHz? Slyší v tomto spektru někdo? Myslím tím lidi :-) já končím u cca 15-16kHz a to mám velmi dobrý sluch. To můžete napsat i 1MHz a dolnopropustní filtr to spolkne, ale napsat to můžeme také...
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