sample_rate/fft_size/N = fft_rate
N = sample_rate/fft_size/fft_rate
The fftsink_nongl.py wants to decimate the stream of fft vectors by N to
achieve fft rate (aka frames per second).
If you tell fftsink_nongl.py a sample rate that is greater than your
actual sample rate, then N will be too large, and the frame rate will be
very slow.
-Josh
adib_sairi wrote:
> Dear All,
> I am exploring the fftsink_nongl.py file because i want to modify it to be
> the sensing method of my project. in the fft_sink_c class, there is a signal
> processing block call keep_one_in_n. I think that this block is use to
> slowing down the sampling of the spectrum sense, am I correct? if i remove
> this block from the flow graph, the output value will be unexpected
> (unreliable). can any one tell me what is actually happen? what did i need
> if i want to remove this block? because this block make my sensing speed
> extremely slow..
>
> best regards,
> Adib
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