Is there anything called uncorrelated filter? I understand to an extent various filter like low pass filter, high pass filer, Wiener  filter Kalman filter etc. I also understand some of this filter will decorrelate/uncorrelate the signal. The question is: is there any filter which does nothing but uncorrelated a signal? What I mean by decorrelate is the following. Consider $x$ is the signal and we apply a filter $w$ to $x$, after the operation we get say $y$ now, I want $y$ to have zero auto-correlation for say $n$ number of samples, preserving the edges as surely those would form correlated section. An obvious answer (as pointed out in comment) of 0 as $w$ is not considered interesting.
I do not know if you are referring to a Whitening filter (check this). A Whitening filter can be viewed as a tool converting the correlated sequence into a white sequence. The application of this can be found in Wiener filter and speech compression. For example, in speech compression, the speech signals are highly correlated, which means they are highly redundant. Whitening them by converting them into white sequences (No redundancy) can reduce the complexity to compress the speech.