7.37.3 Can you answer these questions?

7.37.3.1 Spectrogram/SpectrogramArray output

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=257585

Is there/ What is the trick to get the output of the STFT as {Fourier coeff., freq, time} format from Spectrogram/SpectrogramArray/anything else? 
[fourier-analysis]
 

asked by spacetime https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=79846 3 votes

7.37.3.2 Go back to a symbolic expression to evaluate derivative

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=257567

I have the following code. 
... 
[calculus-and-analysis] [symbols]
 

asked by Granger Obliviate https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=74326 1 vote

7.37.3.3 Pattern matching at multiple levels

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=257651

Pattern matching is my favorite feature. Is it possible to destructure a symbol but still refer to the whole symbol? I mean something like (this won't work of course) 
... 
[pattern-matching]
 

asked by Diffycue https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46327 4 votes