Frequency of N24/World pips

Hi

Does anyone know the frequencies of the pips on the countdowns and titles for World and News Channel?
From my analysis the lower toned one is ~475 and higher toned one is ~925, but I'd just like exact figures if anyone would have them.

Apologies if I seem a bit pedantic :p
Many thanks

How about 462 and 932? Those coincide with A#/Bb notes an octave apart.

https://pages.mtu.edu/~suits/notefreqs.html

Thanks Steve
I want to make some countdown and title "inspired recreations", similar to what Martin's done