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

SciPy Trac scipy-tickets@scipy....
Sat Feb 6 19:21:38 CST 2010


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

Comment(by warren):

 Correction: I left out the factor of 2*pi*f0 in the last equation for the
 phase;
 it should be

     phase = 2*pi * f0 * ((f1/f0)**(t/t1) - 1) * t1 / log(f1/f0)

 And the only constraint is that f0 and f1 are *nonzero* and have the same
 sign.

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Ticket URL: <http://projects.scipy.org/scipy/ticket/1105#comment:2>
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