"Sylvain" wrote in message
...
I just wrote a little bit hastily:
the thing goes biiiiip biiiip biip bip then back to biip

ok, it's a lousy explanation; but Doppler effect it is
(with two ps);

So, it's really that it goes "biiiiipp biiiipp biipp bipp then back to
biipp"?

Just trying to make sure we've got it straight here.