It is digital filters. Look at this thread
Digital Filters (basic explanation) :
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Indicators of FTLM (Fast Trend Line Momentum) and STLM (Slow Trend Line Momentum)
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Main difference of FTLM and STLM from classical technical instrument Momentum is that for its calculation not the close prices but smoothed (leveled) in the result of filtration values of the trend line are used. In the result FTLM and STLM turn out more leveled (smoothed) and regular functions than the classical instrument Momentum, and therefore have more forecasting value.
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And look at this thread as well
Trading Strategies Based On Digital Filters