[ska]

A tiny percentage of the time occasionally when a successful company makes a N-hundred million purchase of a technology and company and you don't understand why, it's because they have made a mistake.

The smart money, though, is on the main chance: you don't understand the purchase, or the problem domain, or both.

In this case I think you are overestimating the progress in NN and search, and underestimating the signal processing. Have you tried this with any significant corpus?

"Whack it through a FFT and do correlation " seems like one of the obvious solution to the toy problem version, but this is exactly the sort of thing that usually falls apart in practice.