That Law & Order noise-- This is what it is.

Cafe Society
1

“The mark is described as consisting of two musical notes, a strike and a rapid rearticulation of a perfect fifth pitch interval, which in the key of C sounds the notes C and G, struck concurrently.”

That’s how it is trademarked, anyway. Yeup, it is trademarked. Th-chunk!

2

It’s not two different pitches. It’s two of the same pitch.

IMDB says “The distinctive “thunk-thunk” sound effect used in between scenes was created by combining close to a dozen sounds, including that of a group of monks stamping on a floor. The sound is intended to be reminiscent of both a judge’s gavel, and a jail cell door slamming.”

I assume monks don’t stamp any differently from other people, but it don’t sound like stamping to me either.

3

Hey, that is what is written on their trademark and I think they’d know.

4

To clarify that language, Knowed Out; each of the two hits of the “sound” is an identical perfect fifth interval.

5

IMDb trivia is about as useful as a Wikipedia article with no cites.