Hi.

Can anyone please explain this indicator as my French is limited. See: http://hk-lisse.over-blog.com and the Blog Post on the 14th May 2009 (bottom 1/3rd of the page)

The original French description is:

“Dans le dernier article sur l’algorithme de Goertzel, le programme permettait de retrouver les 2 périodes des cycles qui avaient la meilleure réponse.  Je l’ai complèté et corrigé pour qu’il sorte également l’amplitude correcte du cycle ainsi que la phase : cela afin de pouvoir redessiner la courbe.
Dans l’exemple ci-dessous, le signal (en noir) est une sinusoïde de période 11 ajoutée à une sinusoïde de période 19 (d’amplitude 2) avec un décalage de phase (90),  le tout avec une pincée de bruit..   Les 2 courbes (rouge et bleue) sont reconstruites par le programme, il reste à les superposer pour avoir le signal sans bruit.”

Which I have “translated” as:

“In the last article on the Goertzel algorithm, the program allowed to find the 2 periods of cycles that had the best answer/fit. I completed and corrected it to also ensure the correct amplitude of the cycle and the phase in order to redraw the curve. In the example below, the signal (black) is an 11 period sinewave added to a 19 period sinewave (amplitude 2) with a phase shift (of 90 degrees), all with only a tiny bit of noise. The two curves (red and blue) are reconstructed by the program, it remains to superimpose to have the signal without noise.”

But this translation doesn’t really help me fully understand the indicator and how to use it or what to set the value of K to?
I am not clear in how this algorithm indicator helps predict the turning points in a market although I am familiar with John Ehler’s MESA Cycle/Phase concepts. I guess a good translation would be a start. It seems John Meyer gets good trading system results with high % of winning trades with good profit factors using the Goertzel Algorithm.

Any help would be great,
Thanks in advance,

ProRealTime Code:

//k = the frequency already found//
// sous prgm goertzel  biss //

a=barindex
sig=sin(360*a/11)+2*sin(360*a/19+90)
b=SQRT(barindex*(b+1))
b=abs((b-ROUND(b))*4)
c=b-1
sig=sig+c
n=200
pr=sig
alpha=2*cos(360*1/k)
q1=0
q2=0

for i=n downto 0//fenêtre de 200 barres
q3=pr[i]+alpha*q1-q2
q2=q1
q1=q3
next

amp=sqrt(square(q1)+square(q2)-alpha*q1*q2)
real=q1-(alpha*q2)/2
imag=q2*sin(360*1/k)
phas=atan(imag/real)

if real<0 then
phas=phas+180
elsif real>=0 and imag<0 then
phas=phas+360
endif

return (2*amp/n)*sin(360/k+phas[1]+90),sig