# Frequencies for Fourier coefficients [duplicate]

I have been given the task of calculating the frequencies to which the fourier coefficients correspond.

So my input is a discrete signal [1,4,0,1], which gives me [3, 0.5+1.5i, -2, 0.5-1.5i].

What is an intuitive way to calculate the frequencies from this result (Or can I see them already based on the coefficients)?

## marked as duplicate by corey979, mikado, Johu, m_goldberg, Community♦Sep 24 '18 at 8:22

• You'll need to know the sampling rate $sr$ (in samples/sec). The first frequency is always DC (0-frequency). Then the frequency of the $n$th bin is sr/n (in Hz). – bill s Sep 23 '18 at 16:20