Figure 1From: Goertzel algorithm generalized to non-integer multiples of fundamental frequencyThe picture at the top shows the sum of two harmonic signals with frequencies 770 and 1477 Hz. It is 205 samples obtained with fs = 8000 Hz. The bottom picture shows the spectrum of the signal: the DFT coefficients (1) are depicted with black fill, the red ones are the values of DTFT for a non-integer mesh of frequencies (22).Back to article page