Deletion of Expansion in spectrograms

Comment: This article looks like a badly copied version of some paper or book based exposition on this topic. A quick look at the article revealed both a wrong title in one of the references and a couple of serious math errors in the first equation. The topic itself is likely notable, as expanding time frequency transforms in terms of spectrograms can speed up computation of these quantities. But the current article would require quite a lot of work to both convert it to an encyclopedic format and to eliminate the other probable errors in the prose and math. Normally, I'd say 'keep' for a notable topic. but it may be better in this case to blow it up per  and start over. I'm on the fence, so no recommendation yet
Stance: comment
Cited policy: Wikipedia:Blow it up and start over (WP:TNT)