[Scipy-tickets] [SciPy] #1105: Logarithmic chirp frequency sweep incorrect

SciPy Trac scipy-tickets@scipy....
Mon Feb 15 12:28:02 CST 2010


#1105: Logarithmic chirp frequency sweep incorrect
-----------------------------------------+----------------------------------
 Reporter:  johntryan                    |       Owner:  somebody
     Type:  defect                       |      Status:  apply   
 Priority:  normal                       |   Milestone:  0.8.0   
Component:  scipy.signal                 |     Version:  0.7.0   
 Keywords:  chirp logarithmic frequency  |  
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Comment(by warren):

 I just checked matlab's chirp here:

 http://www.mathworks.com/access/helpdesk/help/toolbox/dspblks/ref/chirp.html

 The method they call 'logarithmic' is what I have implemented as
 'geometric'.  So perhaps we should just replace the old formula in the
 'logarithmic' method with the correct formula for a true logarithmic (aka
 geometric, aka exponential) sweep.  That's my preference now.  I kept the
 old formula in there for backwards compatibility, but I'm now convinced
 this is actually undesirable.

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1105#comment:10>
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