Re: [Discuss-gnuradio] Use of bin_statistics

[adib_sairi]

Firas A. wrote:
> 
> 
> Important Note:
> Beside tunning time depends on the hardware (RF syenthesizer speed),
> one should remameber that the time needed to collect 1024 samples 
> with decimation rate=8 (minimum USRP decimation) is 128 usec
> 
> while :
> 
> Time needed to collect 1024 samples with decimation rate=256 (maximum 
> USRP decimation) is 4.096 msec
> 
> This means that the tune delay in the case of decimation rate =256 
> should be larger than that used for deimation = 8.
> 
> 

i have a question regarding the above quote, if we are taking 1024 bin FFT,
do we need to have 1024 of signal samples?

and i have another question, regarding the FFT block, i try to come out with
the equation on what is actually this block (gr_fft_vcc)  do in the code,
but i cannot trace the whole code (in c++). if we open the c++ code and we
can see that the only thing that gr_fft_vcc class do is calling set_window
function but no "work" class inside.. so which file/class actually does
implement the fft computing? is it in gr_fft__vcc_fftw.cc? i am sorry to ask
this question.. hope anyone can help =) thanks..

Adib


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