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Q&A

Posts tagged signal-processing

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Q&A H(jω) does not exist for unstable systems, but we still use it when designing controllers - contradiction?

According to Signal processing and linear systems by Lathi, the transfer function $H(j\omega)$ does not exist for systems with poles in the RHP: - This makes sense to me, since $H(j\omega) = \fr...

3 answers  ·  posted 2y ago by Carl‭  ·  edited 8mo ago by Lorenzo Donati‭

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Q&A What does it mean for a signal to have impedance?

What does it mean for signals to have impedance? To me, impedance is kinda like an "extended resistance" that also includes phase shift $$Z = R + jX $$It makes sense to me that components like cap...

3 answers  ·  posted 1y ago by Carl‭  ·  last activity 12mo ago by TonyStewart‭

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Q&A A signal with one mode or with three or more modes

The term "Discrete" uses to describe a signal with two modes, but is there a term to describe a signal with just one mode or with three or more modes? Question update: Also, isn't a wave with just...

3 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

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Q&A Why is the Linear Time-Invariant System (LTI) dominant in Signal processing?

I just want to know why the Linear time-invariant(LTI) systems are a rich class in Signal Processing. Ofcourse there are different systems but still LTI is stressed a lot in academia. Is there any ...

1 answer  ·  posted 3y ago by aditya98‭  ·  last activity 3y ago by Olin Lathrop‭