title: Is there a major difference between the two scipy Hilbert transforms?
body: <p>I was looking for Hilbert transforms in the scipy package and I noticed there are two versions of the Hilbert transform--one in <a href="https://docs.scipy.org/doc/scipy-0.16.1/reference/generated/scipy.fftpack.hilbert.html" rel="nofollow"><code>scipy.fftpack</code></a> and the other in <a href="https://docs.scipy.org/doc/scipy-0.16.1/reference/generated/scipy.signal.hilbert.html" rel="nofollow"><code>scipy.signal</code></a>. I saw that they differ in the outputs being complex conjugates, but are there any other fundamental difference between the two Hilbert transforms I should be aware of before using one version or the other? Nothing particularly jumped out at me when I looked at the source-code.</p>