local music fingerprinting in 1/2 a GB?

Huh - Google's Pixel 2 does Shazam/Soundhound style audio fingerprinting locally? And that db for that is only half a GB? I never would have suspected the numbers were like that (even knowing factoids how like a simple formula "does the subsequent note in series go up or down, note by note makes a unique key for melodies in a surprisingly small number of notes")