Talk:Spectral envelope

Abuse Incident
This page has been subject to an unprecendented kind of repeated vandalism: two users, one in Singapore and one in India, appear to be using this page as a substitute for personal email. They write in a combination of English and other languages. In an attempt to stop this, the page has been temporarily protected. If you wish to make a valid contribution to this article, contact an administrator. -- Tim Starling 05:15 10 Jun 2003 (UTC)

Unprotected. I will monitor via my watchlist, if it starts up again it can be re-protected... Evercat 02:48 20 Jun 2003 (UTC)


 * Thanks Evercat. I think they got the message. They didn't just switch pages, did they? -- Tim Starling 02:54 20 Jun 2003 (UTC)

Hard to tell since they were on dynamic IPs, but I don't think so. Hopefully they found a more sensible way to communicate their secret love, or whatever it was... :-) Evercat 02:58 20 Jun 2003 (UTC)
 * Actually I looked into this a while back, and the one in Singapore was a dynamic IP, but the India one seemed static. I blocked that IP for a week and the problems stopped for a week.  This evening 203.145.172.50 created a new page, Linearprediction, with the same sort of stuff in it. - Hephaestos 05:26 21 Jun 2003 (UTC)

Scope
There's some ambiguity in the purpose of this page (an important topic, imo). Has Spectroscopy Project has laid clame to it? The definition comes from the citation by Schwartz, using the term in an acoustic context. I'm not invested in any particular context, but I think the scope should be made clear. For now, I'll assume its more broad interpretation. Jimmy Hers (talk) 02:58, 1 November 2013 (UTC)

Summary
I'm trying to figure out exactly what an envelope is and find the current definition unclear:
 * "A spectral envelope is a curve in the frequency-amplitude plane, derived from a Fourier magnitude spectrum. It describes one point in time (one window, to be precise)."

Is the following a correct interpretation?
 * A spectral envelope is a curve in the frequency-amplitude plane of a time series at one point in time within the series. Such a curve is most easily derived by conversion of a window bracketing a point in time to the frequency domain by application of a Fourier transform. Jimmy Hers (talk) 02:58, 1 November 2013 (UTC)