to get a moving average like filter on ADC data in microcontrollers, i like to use the following code:

average = average   ((new_value - average)>>2);

it works nicely and super fast and I can adjust the filterstrength just by changing the amount of right-shift.

My question is now: has this filter a name?

cheers :)

CodePudding user response：

Somewhere between Cumulative Moving Average and Weighted Moving Average

CodePudding user response：

In general terms, it can be a specific case of Savitzky-Golay method as well. It is a low pass filter with the following explantion:

A Savitzky–Golay filter is a digital filter that can be applied to a set of digital data points for the purpose of smoothing the data, that is, to increase the precision of the data without distorting the signal tendency. This is achieved, in a process known as convolution, by fitting successive sub-sets of adjacent data points with a low-degree polynomial by the method of linear least squares. When the data points are equally spaced, an analytical solution to the least-squares equations can be found, in the form of a single set of "convolution coefficients" that can be applied to all data sub-sets, to give estimates of the smoothed signal, (or derivatives of the smoothed signal) at the central point of each sub-set.