Re: [Discuss-gnuradio] Need help to understand code of sync:decimator block

[Miklos Maroti]

Hi Kunal,

Use a decimating FIR filter with taps [0.2, 0.2, 0.2, 0.2, 0.2] and
decimation 5. It will be faster than anything you are about to write.

Miklos

On Sat, Mar 8, 2014 at 12:03 PM, kunal sankhe <address@hidden> wrote:
> Hello Marcus,
>
> Sorry for my vague explanation. I want to write a block which will calculate
> moving average for a block of samples. I have only one input in this case. I
> am providing my data serially using vector to stream converter. I want to
> calculate average of a block of 5 samples.
>
> eg. from vector source {1,2,3,4,5,6,7,8,9,10}, i will get stream of
> integers.
>
> Now I want to calculate average for first 5 samples i.e. 3 and then it
> should calculate average of {6,7,8,9,10} which is 8. So i should get desired
> output as {3,8}.
>
> So I should get output for a block containing 5 samples. It should again
> consider block of 5 next samples and calculate average.
>
> Please let me what changes do I need to make.
>
> Thanks,
> Kunal
>
>
> On Sat, Mar 8, 2014 at 3:23 PM, Marcus Müller <address@hidden> wrote:
>>
>> -----BEGIN PGP SIGNED MESSAGE-----
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>> Hello Kunal,
>>
>> You don't want to use set_history in this case:  you want to produce 1
>> output for 5 input, so you use a decimator; that's all you need to do. Drop
>> the set_history.
>> For reference: history is when for every input item you need the last 5
>> items before,
>> http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules#set_history
>> Greetings,
>> Marcus
>> - --
>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
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>
>
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