Looking for half duplex simulation algorithm

[Ronen Yacov]

Hi Everybody,

I'm working in an application which enables clients to transmit audio
to each other in full duplex.
We want to make the system half duplex - what we are going to do is
compare the incoming
Audio wave to the outgoing, and if the outgoing wave is stronger - we
are going to broadcast.
If not, (Outgoing < Incoming) then we are going to block it.
Is Anyone familiar with algorithm how do such comparison ( what to
convert - average, pick ?)

Thanks,
Ron