Unit delay connected to pulse generator

2012 11 24
1 个回答
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I connected pulse generator followed by unit delay to scope, in pulse generator period is 1 sec, pulse width 5%, In unit delay sample time is -1 (inherited)
But the pulses from unit delay are little delayed nearly 0.05 sec(width of actual pulse) and pulse width is 20%
I checked this with a mean block,I expected that unit delay would give delay of 1 sec by default to the pulses with width 5%
what unit delay does here.?

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-11-24
编辑：Azzi Abdelmalek 2012-11-24

1 个投票

You said that Sample time is inherited, which means it's inherited from your step size (variable or fixed). If you want 1s then set a sample time to 1.

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V Vaishnavi Kumar
V Vaishnavi Kumar 2012-11-24
k i ll try... why the pulse width is changed..
Azzi Abdelmalek
Azzi Abdelmalek 2012-11-24
编辑：Azzi Abdelmalek 2012-11-24
I don't think the width can be changed with unit delay block. Check again the width of your pulse, unless the step size is variable. then set a sample time of your unit delay to 1 and check again.
V Vaishnavi Kumar
V Vaishnavi Kumar 2012-11-24
I dint specify any step size first, and matlab took as 0.2 sec by default. Then i gave 1 sec as sample time and the scope showed step output for same pulse input.
I understood that as my sample time is greater than pulse width(0.05 sec) it showed so., i kept sample time as 0.01 sec. now output is similar to input with the delay of 0.01 sec as given.
for the same pulse width with 0.05 sec and 1 sec period, how 1 sec delay could be given
Azzi Abdelmalek
Azzi Abdelmalek 2012-11-24
If your unit dealy sample time is greater then your pulse generator period, the unit delay block will give anything!

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