Generalized Goertzel algorithm

Goertzel algorithm generalized to non-integral multiples of fundamental frequency.

The conventional Goertzel Algorithm can be used to compute individual DFT coefficients. In case we need to compute some values of DTFT (that means, non-integer multiples of the fundamental frequency), slight modification must be done.

There are two files: the conventional and generalized Goertzel algorithm. No toolboxes needed.

The algorithm and its derivation is described in the article accesible at

https://asp-eurasipjournals.springeropen.com/articles/10.1186/1687-6180-2012-56