[Discuss-gnuradio] mean value block

[konvak]

hi all,
         I would be interested in getting and displaying some 
statistical information (mean, variance...) about received signal (let's 
say for educational purposes to try to determine what kind of modulation 
I am receiving). Is there any way to get let's say the mean value of the 
signal without writing a new block. The only thing I came across is 
gr.probe_signal_f() to get the value of the signal. Is it possible to 
get _every_ sample with this, somehow I don't think it would work. So do 
I really need a new block?

thanks for any suggestions and help,
tomas