continuous signal delay

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mado
mado el 6 de Jun. de 2012
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.

Respuestas (3)

Kaustubha Govind
Kaustubha Govind el 6 de Jun. de 2012
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 el 6 de Jun. de 2012
but this unit delay is for digital and my signal is analog
  2 comentarios
Kaustubha Govind
Kaustubha Govind el 7 de Jun. de 2012
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 el 7 de Jun. de 2012
Perhaps you need the Transport Delay block? http://www.mathworks.com/help/toolbox/simulink/slref/transportdelay.html

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mado
mado el 7 de Jun. de 2012
I tried transport delay but the output of this block is zero , i don't know why
  2 comentarios
Kaustubha Govind
Kaustubha Govind el 8 de Jun. de 2012
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 el 8 de Jun. de 2012
thanks , its working

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