At a quick skim I believe they said that there were 
phase-data and non phase-data available versions.


>>> At a quick glance it looks more related to a fixed 
>>> frequency
>>> plus harmonics DFT.
>>> It would be "faster" than an FFT only because it covers 
>>> a
>>> restricted Spectrum. If I'm correct then an even quicker
>>> method would be to implement an FFT subset targeted at
>>> specific frequencies.

>> "FFT subset targeted at specific frequencies" is an 
>> accurate
>> description of a Goertzel filter.

> You might add that it's missing phase data, no?


        R 

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