Is there an application where it is required to predict turning-points of a signal that is like a sinusoid with constant frequency, variable amplitude and some noise (Gaussian additive noise)? The amplitude of the noise should be less than 10% of the amplitude of the original sinusoid every "oscillation".
Reason I ask is that I think I found an interesting causal filter for this very specific situation, but I have no imagination for the moment on how it could be usefull.
My causal band-pass filter turns earlier than the turning point of the clean sinusoid, so it's like the filter has a negative lag. And the computation time is short, less than my code using FFT (in R: statistics software).
I'm a hobiest in DSP so please excuse my ignorance. My knowledge about filters comes mainly from finance (econometrics).
To the man with a hammer, the entire world looks like a nail..
Thanks for any suggestions.