>> Obviously there must be some sort of hashing involved ... but how? We're 
>> talking a file that has been encoded with a lossy algorithm, and while 
>> the data resembles the original, it is not the original ...
>
> Hmm, interesting. This ought to be highly infeasible.

Actually I have a phone book entry on my phone, which you can call, hold 
your phone up to some random speaker (be it in your car, on the TV, etc) for 
10 seconds, then a few seconds later it texts you back the artist and song 
name.  It's pretty neat and has worked every time I've tried it.

Maybe it works in the frequency domain, so takes the fourier transform of 
the sample, then uses some fuzzy matching algorithm to see what it matches 
up with?

> (But then, so should identifying a CD by it's serial number, and 
> apparently that is a "solved problem".)

What do you mean? Isn't the whole idea of a *serial* number that you can 
identify which one it is?

Post a reply to this message