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Communicate Outside the Box

Inspired by "Drug containers - total isolation" from Michal58. The intended solution is unrelated, though, according to the author.

In the present level, you must send half of the output to the exit labelled "B", while following the same rythm as the "C" output. The problem is to learn when a "C" output is coming. You get a signal in a conduit, but this conduit ends in a closed-off area: you can't make any block pass through the "field" at the top of the area. How are you going to pass information from this signal outside the enclosed area?

At least one older level explored using a lifter, but there is another way---lifters are disabled here.