[Scipy-tickets] [SciPy] #1812: Erratic phase plot for high order filters

SciPy Trac scipy-tickets@scipy....
Sat Jan 12 20:56:48 CST 2013


#1812: Erratic phase plot for high order filters
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 Reporter:  kitmonisit  |       Owner:  somebody   
     Type:  defect      |      Status:  new        
 Priority:  normal      |   Milestone:  Unscheduled
Component:  Other       |     Version:  0.11.0     
 Keywords:              |  
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Comment(by kitmonisit):

 I'm sorry about the list formatting in the original post. Here is a more
 readable version:

 1. Set up specifications[[BR]]
 2. Convert Hz to rad/s (w is "omega")[[BR]]
 3. Normalize w from 0 to 1[[BR]]
 4. Calculate required filter order and natural frequency
 (scipy.signal.buttord)[[BR]]
 5. Calculate zeros, poles, and gain (scipy.signal.butter)[[BR]]
 6. Create LTI system (scipy.signal.lti)[[BR]]
 7. Compute Bode plots (scipy.signal.lti.bode)[[BR]]
 8. Convert w back to f and scale appropriately[[BR]]
 9. Plot stuff to "plot.pdf"

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1812#comment:1>
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