continuous signal delay

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mado
mado 2012-6-6
I have continuous signal generated from simulink and i want to make dp = p(k)-p(k-1) where p(k) is the current and p(k-1) is the last value from last reading of simulink.

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回答（3 个）

Kaustubha Govind
Kaustubha Govind 2012-6-6
Feed p(k) into the Unit Delay block to get p(k-1) and subtract the latter from the former to get p(k)-p(k-1).
mado
mado 2012-6-6
but this unit delay is for digital and my signal is analog
  2 个评论
Kaustubha Govind
Kaustubha Govind 2012-6-7
Did you mean to say that Unit Delay is a discrete-time block? Yes, but in your question, you said you need p(k-1), which is a discrete-time representation.
Kaustubha Govind
Kaustubha Govind 2012-6-7
Perhaps you need the Transport Delay block? http://www.mathworks.com/help/toolbox/simulink/slref/transportdelay.html

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mado
mado 2012-6-7
I tried transport delay but the output of this block is zero , i don't know why
  2 个评论
Kaustubha Govind
Kaustubha Govind 2012-6-8
It is probably zero for the length of the delay that you've specified. Increase the simulation stop time to see if the delayed signal is eventually displayed.
mado
mado 2012-6-8
thanks , its working

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