Signal Processing and Mathematica (filters)

Click For Summary

Discussion Overview

The discussion revolves around a problem related to signal processing using Mathematica, specifically focusing on calculating the bandwidth of a filter defined by a given transfer function. Participants explore methods to determine the bandwidth where the magnitude of the filter exceeds a certain threshold.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Homework-related

Main Points Raised

  • One participant presents a filter function and requests assistance in calculating the bandwidth where the magnitude exceeds a specific value.
  • Another suggests defining the bandwidth condition in terms of the filter function and possibly using Mathematica code for clarity.
  • A participant inquires about the possibility of plotting the bandwidth region to identify minimum values.
  • Another participant indicates that finding minima is unnecessary and emphasizes the need to express the problem in terms of real numbers to identify the bandwidth interval.
  • A later reply mentions that they resolved the issue by plotting the magnitude of the filter alongside the threshold and reading the intersection points, noting that the solution was not exact but satisfactory.

Areas of Agreement / Disagreement

Participants appear to have differing views on the necessity of finding minima versus simply identifying the bandwidth interval. The discussion includes multiple approaches and interpretations without a clear consensus on the best method.

Contextual Notes

Some assumptions regarding the definitions of bandwidth and the interpretation of the filter function may be implicit. The discussion does not resolve these assumptions or clarify all mathematical steps involved.

1sprit
Messages
3
Reaction score
0
Mathematica problem:

Filter:

H(jw)=(3.84+5 (j w))/(5+j (1.11 w^2))

Bandwidth where:

|H|>1/Sqrt[2]*Hmax

Calculate the bandwidht

Tips or solution would be much appriciated

Thanks
 
Physics news on Phys.org
Suggested starting point: define the bandwidth condition in terms of the given function, maybe in Mathematica code if that is the way you want to work this out. Spell it out - ambiguous (needs interpretation) as you present it.
 
Thank you!

Is it possible to plot the region of the bandwidth and look at the minimums?

Svensk? :)
 
You don't need to find any minima - it's a matter of finding the interval that satisfies the bandwidth definition. For that you need to express things as real numbers, which is what the suggestion about spelling things out was about.

Och, ja, jag är svensk :-)
 
Tack för svar

Jag löste det genom att plotta |H| tillsammans med Hmax/Sqrt[2] och avläsa skärningspunkterna. Blev inget exakt svar men det får duga :D
 

Similar threads

Replies
16
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 12 ·
Replies
12
Views
4K
  • · Replies 11 ·
Replies
11
Views
3K
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K