DC Components and Frequency

1. What is DC frequency component?
2. How do you calculate the DC component of a signal?
3. How do you find frequency components?

What is DC frequency component?

“DC” stands for “direct current”, in contrast to the sinusoids, which “alternate”, though we use this term even if the signal isn't a current. In a sense, the DC component is like the “zero frequency component”, since cos(2π·0·t) = 1.

How do you calculate the DC component of a signal?

In order to calculate DC component of AC source, one is required to find the fourier series of the periodic AC source and the constant coefficient denotes the DC component value. DC value of half-sinusoidal signal is (peak voltage)/pi. DC value of general waveform can be seen easily on the display of digital CRO.

How do you find frequency components?

If x is an point segment of , one way to determine its frequency content is to take its discrete Fourier transform (DFT) by using the fast Fourier transform (FFT) to compute it: >> X=fft(x); This gives us an component vector , which in general will be complex valued.