Re: [Discuss-gnuradio] Moving Average Block

[Marcus Müller]

Hi Pedro,

is nothing but the moving average over the squared magnitude.
Sadly, your formula
doesn't specify what T signifies; is T used as a single sum over N samples' squared magnitudes, or is it something running (i.e. you get as many Ts as you consider samples.

I just assume you really are looking for a moving average, in which case your flow graph is correct.

Timothée told me to use stream to vector, but if I pack them, each 100 samples will become one single information, right? What I need is more like a controller that gives me 100 samples at a time.

Really, I'm not sure where the formula you attached came from, or what you mean, or if what you mean is what you need...
Maybe you could just write down, explicitely, what *each* output sample should be (which is why I wrote rather than ).


Best regards,
Marcus

On 12.01.2016 17:27, Pedro Gabriel Adami wrote:

Dear all,

In addition to my previous response, I'm attaching an image that shows the formula I'm trying to build in gnuradio (using blocks). But instead of n = 0 and N-1, I need n = 1 and 100 (100 samples). The second picture shows how I tried to do in Gnuradio, but the moving average block does not get 100 samples the way I need (as we could see in the previous answers).

Timothée told me to use stream to vector, but if I pack them, each 100 samples will become one single information, right? What I need is more like a controller that gives me 100 samples at a time.

Please, I appreciate if you could give me some tips.

Thanks in advance.

2016-01-08 14:47 GMT-02:00 Timothée COCAULT <address@hidden>:

Whoops, just noticed I didn't reply to all when I answered so my message and Pedro's response were not forwarded to the mailing list :

Le jeu. 7 janv. 2016 à 20:28, Pedro Gabriel Adami <address@hidden> a écrit :

Dear, Timothée,

Thank you so much. I am doing some tests and I've realized that the results are a little strange. That is why I asked.

Let me ask you one more thing: Do you know some block that is capable to retain N samples, so I can use them and after that, it retains the next N samples? Like a variable where I can "save" the information for a short period of time, but my Gnuradio does not have a "variable sink".

Thanks in advance.

Em 07/01/2016 17:18, "Timothée COCAULT" <address@hidden> escreveu:

Hi Pedro,

When you're not sure, the best solution is often to look at the code.

If you look at the work function in gr-blocks/lib/moving_average_XX_impl.cc.t, you see that the block first sums the history (of length 100 in your case).

For each additional input items, it adds the new item and subtracts the n-100 item, and outputs the current sum.

So it will first calculate 1+...+100, then 2+...+101 and so on.

Regards,

Timothée. 

 

I don't understand exactly your question but you can use a stream to vector to group your items in packets of size N, and plug it into a probe signal

--

Atenciosamente,

Pedro Gabriel Adami

Graduando do 5º período de Engenharia de Controle e Automação no Instituto Nacional de Telecomunicações - Inatel

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