Times sampling or divides in the Capon method of minvar function.

[xifenglu]

1. Describe the bug
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2. To Reproduce
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• OS: [e.g. Fedora, windows version, mac version]
• Python version. for example 3.7.2 (please provide X.Y.Z numbers)
• Version of spectrum:

you can figure out the version using this python code::

import spectrum
spectrum.version

3.Expected behavior
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4.Screenshots
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5.What you think may explain the pbl

I like this module and it is so powerful. I have one question/confusion.

math:: P_{MV}(f) = \frac{T}{e^H(f) R^{-1}p e(f)}
def minvar(X, order, sampling=1., NFFT=default_NFFT):
.. math:: P{MV}(f) = \frac{T}{e^H(f) R^{-1}_p e(f)}
......
# Invert the psi terms at this point to get PSD values
PSD = sampling / np.real(psi)

It times T in the math, but it times sampling in the PSD calculation inside the minvar function. I believe T=1/sampling. When sampling=1, there is no problem. If sampling !=1, it will get wrong answer for power or PSD. I may misunderstand, but can you please verify that.

Thanks.

Steve