Ray Burkholder wrote:
Might want to write a new
"energy detector" algorithm in dsp.c though based on a wideband/low Q
resonator approach (move the pole way in towards the origin)
as opposed to
narrow band goertzels (pole on the unit circle). More robust
for this type
of work.
Where does one go to learn this terminology and the math to implement it?
Apparantly not to this source. :-) A Goertzel filter finds one output
bin of a DFT. Since the width of the bins in a DFT is directly related
to the number of samples you include in a processed block, the width of
the Goertzel is too. A Geortzel is as wide or as narrow as you want it
to be. Oh, and k does not need to be an integer, unless you are trying
to evaluate phase. That is a common misconception. There is a sliding
window version of a Goertzel filter, but this has the same
characteristics as the standard version, as it is just a trick for
calculating a continuous stream of Goertzels efficiently.
Regards,
Steve
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