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Issues with Simulink unit delay

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Robert
Robert 2021년 9월 11일
답변: Paul 2021년 9월 11일
ok so apparenlty im stupid or something
all i want to do is phase shift a digital signal. Say i have a square wave signal that can change state every 1mili second.
It can go up or down and down and down or up and up. Think of i like the output of a sampe and hold.
I want to take that signal and shift it to the right by 500uS.
So when the original signal changes state either positive or negative i want the modified signal to follow suite but 500uS later.
I would of thought all i needed to do was a simple 1/z with a sample time of 500uS
However that is not the case.
I expect the modified signal to have the same period of 1mS just shifted.
For some reason when i add the delay of 500uS sometimes it delays it by 500uS other times it delays it by some other amount of time. but more importantly it changes the period of the modifed signal to something else???
I have no clue what is going on. All i want to do is phase shift the thing. I dont understand what im screwing up here.
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Robert
Robert 2021년 9월 11일
No one has any ideas????

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Paul
Paul 2021년 9월 11일
Using a unit delay is probably not what you want, because the output of the delay is held constant until the next sample time.
Instead, it sounds like what you want to use is a Transport Delay block. That block will delay its input by a fixed time, but the outupt might look odd to the eye depending on solver settings, other blocks in the model, how the input and output to the Transport Delay block is used, etc.

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