The Spitz estimate

Equation () assumes that the signal PEF is known in advance. This argument is circular since we are estimating the signal needed to compute 367#367! Nonetheless, () shows that 367#367 can be estimated directly from the data PEF 110#110and the noise PEF 366#366. Again, we assume that we are able to compute a model for the coherent noise we wish to attenuate. In equation, the signal PEF can be estimated as follows:  

 382#382 (150)

In the next section, I show on a simple 1D example that this estimate makes the overlap of the signal and noise operators 380#380 and 381#381impossible