[SciPy-Dev] Add detrend=None for scipy.signal.welch et al.

[Maximilian Singh]

Hey all,

I suggest to add the possibility to turn off the 'detrend' functionality
in scipy.signal.welch and scipy.signal.periodogram, e.g. by giving
'detrend=None' as parameter.  Although detrending is an useful option,
there are also use cases where DC should not be suppressed.

Do you agree that this is common enough to be added?

-Max
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