I have created with usage of FIR compiler IP a simple low pass filter. The low-pass filter is described by the formula: y(n) = 2y(n-1)-y(n-2)+x(n)-2x(n-6)+x(n-12). It has cut frequency around 11 Hz. I have used it for filtering and denoising a ECG signal.
Here are example signal before and after filtering: