Goertzel Algorithm direct form

curious_mind · Jun 9, 2019

I was referring to this site https://www.codeproject.com/Articles/841228/Second-Order-Goertzel-and-Reinsch-Algorithm to understand the goertzel algorithm. I am not clear as the article explains that input and output sections are interchanged to make the input stage recursive, while output is computed only once. Can anybody explain how this could be possible.

kripacharya · Jun 15, 2019

I think the article explains exactly this in great detail. The purpose is to not repetitively do the complex calculation except once at the end.

curious_mind · Jun 23, 2019

OK, I do have confusion about the final equation after N iterations. Referring to the link, https://stackoverflow.com/questions/11579367/implementation-of-goertzel-algorithm-in-c
Where does real = (q1 - q2 * cosine); imag = (q2 * sine); come from?

Goertzel Algorithm direct form

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Goertzel Algorithm direct form

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