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Hello,
Why can the cby operator have a different clock than the x or y streams?

in * TF "Emb. Sys. and Rob." by (220 points)

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(x cby y) is essentially y shifted one step to the right (ignoring the initial value that comes from x). Hence, all values including the boxes move one step to the right. Typically, that moves a box to a place where before there was no box and a place where there was no box may become a real value. Hence, the clocks of y and (x cby y) are usually different ones. Note that the clock is a boolean stream that is 0 if the value is a box, and 1 otherwise.
by (166k points)

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