Fourier seriyasining birinchi harmonikasi signalning eng past chastotali sinusoidal to'lqin hisoblanadi. Bu to'lqinning amplitudasi va davri kabi signalning asosiy ma'lumotlarini o'z ichiga oladi. Ushbu to'lqin signalning past chastotali komponenti deb ham nomlanadi.
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