Time Shifting & Stretching: Questions Explained

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SUMMARY

The discussion focuses on time shifting and stretching in signal processing, specifically addressing the relationships between functions y(t) and x(t). It confirms that if y(t) = x(3t), then x(t) = y(t/3) is correct. However, for the equation y(t) = (-1/2)x(-3t + 2), the proposed transformation x(t) = -2y(t/3 - 2) is incorrect. The correct transformation involves substituting variables to derive the accurate relationship between x(t) and y(t).

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I have a question regarding time shifting, stretching etc. For example:

if I have y(t) = x(3t) does that mean that x(t) = y(t/3)?

if I have y(t)=(-1/2)x(-3t+2) does x(t) = -2y(t/3 -2) ?
 
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lennybogzy said:
I have a question regarding time shifting, stretching etc. For example:

if I have y(t) = x(3t) does that mean that x(t) = y(t/3)?

Yes.

if I have y(t)=(-1/2)x(-3t+2) does x(t) = -2y(t/3 -2) ?

No. Let u = -3t+2 so t = (-1/3)(u-2). This gives

y((-1/3)(u-2))=(-1/2)x(u)

-2y((-1/3)(u-2)) = x(u). Replace the u by t and it's a little different than what you wrote.
 
brilliant! thanks
 

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