Laplace Transform Time Shift Property

Click For Summary
SUMMARY

The Laplace Transform Time Shift Property states that L{f(t-T)} = e^{-sT} F(s) for T ≥ 0. However, for T < 0, this property does not hold due to the definition of the Laplace transform, which requires the function to be defined for non-negative time. Instances where T < 0 lead to undefined behavior in the transform, as the function f(t-T) may not exist in the required domain. Therefore, the time shift property is only valid for non-negative shifts.

PREREQUISITES
  • Understanding of Laplace transforms and their properties
  • Familiarity with the concept of time shifting in signal processing
  • Knowledge of the frequency domain variable 's'
  • Basic calculus and differential equations
NEXT STEPS
  • Study the implications of time shifting in Laplace transforms with T ≥ 0
  • Explore examples of functions where the Laplace transform fails for T < 0
  • Learn about the relationship between time-domain and frequency-domain representations
  • Investigate other properties of the Laplace transform, such as linearity and convolution
USEFUL FOR

Students and professionals in engineering, mathematics, and physics who are studying signal processing or control systems, particularly those focusing on the properties of Laplace transforms.

bran_1
Messages
17
Reaction score
0

Homework Statement


I’m being asked to prove if and why (what instances in which) T<0 for the Laplace transform property of time shifting doesn’t hold.

Homework Equations


L{f(t-T)}=e^-aT* F(s)

The Attempt at a Solution


I know that for T<0 there are instances where the property cannot hold, but I cannot think of an example where the property would fail. (I know the “if”, but not the “why”)
 
Physics news on Phys.org
It should be ## e^{-sT} F(s) ## rather than (-aT) in the exponent
 
scottdave said:
It should be ## e^{-sT} F(s) ## rather than (-aT) in the exponent
Yes, typo on my part. Its supposed to be ‘s’, the frequency domain variable, and T, the time shift.

Would you happen to have any insight to the original problem?
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 79 ·
3
Replies
79
Views
7K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 4 ·
Replies
4
Views
6K