[Scipy-tickets] [SciPy] #1105: Logarithmic chirp frequency sweep incorrect
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Mon Feb 8 15:38:29 CST 2010
#1105: Logarithmic chirp frequency sweep incorrect
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Reporter: johntryan | Owner: somebody
Type: defect | Status: needs_review
Priority: normal | Milestone: 0.8.0
Component: scipy.signal | Version: 0.7.0
Keywords: chirp logarithmic frequency |
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Comment(by warren):
In my patch, 'logarithmic' still computes the sweep using the previous
formula. As I mentioned in item 1 of my list of changes, this sweep gives
f(0) = f0 + 1, and I agree that this is wrong. (Where I said "instance
frequency" I meant "instantaneous frequency".)
I implemented the sweep that you and I agree is the preferred one with the
name 'geometric'. This sweep is also referred to as 'exponential'; see,
for example:
http://en.wikipedia.org/wiki/Chirp
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Ticket URL: <http://projects.scipy.org/scipy/ticket/1105#comment:6>
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