# Ideal Filters

Discussion in 'Homework Help' started by tquiva, Dec 23, 2010.

1. ### tquiva Thread Starter Member

Oct 19, 2010
176
1

Is my answer correct?

2. ### Ron H AAC Fanatic!

Apr 14, 2005
7,049
659
Looks OK, except you evaluated H(∞) at s=1. You should evaluate at s=jω, where ω=∞.

3. ### tquiva Thread Starter Member

Oct 19, 2010
176
1
when I evaluate it for ∞, would I just plus in any number greater than 0 for s? was my answer correct?

4. ### Ron H AAC Fanatic!

Apr 14, 2005
7,049
659
No, you can't substitute a finite number for ∞. Infinity is what it is. Infinite means not finite.
Just remember that ∞ plus or minus any number is still ∞. Also remember that 1/∞=0. You answer of H(∞)≈0 is almost, but not quite correct. I'll let you come back and tell us what you did wrong.

5. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
A bit offtopic, but, why did you change your avatar, Ron? Is that you on the new one?

6. ### Ron H AAC Fanatic!

Apr 14, 2005
7,049
659
I just got bored with the old one (no BS). And yeah, that's me. I am well preserved.