According to Ehlers, the short term information you can get from a sequence of close prices is limited by the aliasing noise.

Basically, according to Ehlers you can't reliably detect a cycle shorter than 8 bars in time to profit from it.

I would like to try to circumvent that limitation by adding synthetic ticks between the bars. I would like to have a series like the following..

..., close2, (low1 + high1)/2, close1, (low0 + high0)/2, close0

but I can't see an easy way to do it.

Any ideas?

You could shift the series manually. But that would probably not much help with aliasing noise, since the low and high are no real samples. On the other hand, the maximum frequency in a sampled signal is half the sample rate. So you can theoretically detect cycles of 2 bars. In reality, the Ehlers 8 bars limit is more realistic.