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# Discussion Groups > Comp.DSP

Comp.dsp is a worldwide Usenet news group that is used to discuss various aspects of digital signal processing.

There are 49 threads in our archives.

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## Oppenheim page 135: discrete-time counterpart of singularity functions?` 0

kiki - 2005-08-17 20:28:00
HI all, this is a question regarding Oppenheim Signal & Systems 2nd Edition page 135. In these pages Oppenheim defined a bunch of continuous-time singularity functions. I am tending to conclude...

## question about interchanging limit and operator in system theory 0

kiki - 2005-08-17 19:09:00
Hi all, x'(t)=limit (x(t)-x(t-h))/h, h -> 0 where " ' " denotes the deriviative. Let's use "L" denotes the operator of LTI system Given L(x(t))=y(t), I want to show that L(x'(t)) = y'(t) ...

## any elegant non-guessed solution for this problem? 0

kiki - 2005-08-17 02:29:00
Hi all, Consider a LTI system with the property that if the input x[n]=0 for all n> =10, then the output y[n]=0 for all n> =15, what condition must the impulse response of the system h[n] satis...

## Is there a reference webpage for dsp? 0

kiki - 2005-08-17 00:12:00
Hi all, I am looking for some reference webpage with centralized information for all those equations in DSP that easily forgotten... for example, transform pairs, all different kinds of transfo...

## about convolution- am I right? 0

kiki - 2005-08-16 23:49:00
Hi all, I just want a confirmation and a double check: suppose y[n]=x[n]*h[n], then x[n-1]*h[n-1]=y[n-2], x[n-1]*h[n]=y[n-1], x[n]*h[n-1]=y[n-1], x[n+a]*h[n+b]=y[n+a+b], am I righ...

## how to solve a differential equation with impulse input? 0

kiki - 2005-08-15 02:29:00
Differential equation such as a simple first order non-homogeous equation: y'(t)+2*y(t) = x(t), now x(t)=delta(t), since I want to find the impulse response of this system to the impulse input...

## collection of mathematically elegant tricks -6

kiki - 2005-07-24 14:14:00
Hi all, I am an engineering student who is interested in math. I don't remember how often I have been amazed by nice and elegant mathematical tricks that make difficult problem suddenly very ea...

## How to show y(t)=x(-t+1) is not time-invariant? 0

kiki - 2005-07-23 02:29:00
Can anybody give the proof step-by-step and not handwaving...? As you can see, I still don't quite understand. In the previous post "Basic systems question: Is this system time-invariant?", so...

## How do you prove Delta(2*t)=1/2*Delta(t) 0

kiki - 2005-07-19 02:46:00
Can anybody show how to prove Delta(2*t)=1/2*Delta(t) Where Delta(t) is the delta- function... Is there a proof that does not use the hand-waving approaxing method? Thanks a lot! ...

## Basic systems question: Is this system time-invariant? 0

kiki - 2005-07-17 23:03:00
y(t)=x(2*t - 2) - x(-3*t + 5 ) where x(t) is the input, y(t) is the output of the system. Is this system time-invariant? Thanks a lot! ...
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