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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?`
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
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?
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?
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?
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?
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
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?
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)
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?
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!
...