[Scipy-tickets] [SciPy] #902: need high, stop, pass options to signal.firwin
SciPy Trac
scipy-tickets@scipy....
Wed Oct 20 14:58:03 CDT 2010
#902: need high, stop, pass options to signal.firwin
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Reporter: tpk@… | Owner: somebody
Type: enhancement | Status: needs_review
Priority: normal | Milestone: 0.9.0
Component: scipy.signal | Version: 0.7.0
Keywords: |
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Comment(by tpk@…):
Replying to [comment:15 warren.weckesser]:
> In the scaling calculation, because m is now properly symmetric, every
term in exp(-1.j*pi*m*scale_frequency) contains its complex conjugate, so
the sum will be real (other than normal machine precision issues). In
fact, we can change the calculation of the sum to
> s = numpy.sum(h*cos(pi*m*scale_frequency))
> and avoid complex numbers entirely.
OK, I see it now... makes sense. I like the "cos" implementation too.
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Ticket URL: <http://projects.scipy.org/scipy/ticket/902#comment:18>
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