From Mladen :::
One more from the creations of John Ehlers.
Best described by Ehlers himself:
John Ehlers:
Take EMA of price (better, a 3 Pole filter).
Take the difference (delta) between Price and its EMA.
Take an EMA of delta (or a 3 Pole filter):
Smoothing will help reduce whipsaws.
Ideally, smoothing introduces no major trend mode lag because delta is detrended.
Add the smoothed delta to EMA for a zero lag curve.
Add 2*(smoothed delta) to EMA for a smoother predictive line.