Re: [Discuss-gnuradio] Filter bank and massive “DDD” messages

[Luis Grajales]

Hi Martin,

Thank you for your message.

I was looking into the null sink blocks documentation and I couldn't find any method or function where I can get an intermediate value into this block. Then, I just verified data at the input of this block, which is the confirmation of the streaming at the output of each channel. For this case I used a file sink block.

Please let me know if I need to do something else, or what is your general idea of the streaming verification into a null sink blocks.

Thanks again,

Luis

2015-06-23 18:20 GMT+02:00 Martin Braun <address@hidden>:

Luis,

can you please confirm/deny that streaming e.g. into a null sink works?

Thanks,
Martin

On 23.06.2015 09:16, Luis Grajales wrote:
> Hi,
>
>
> I'mtrying to filter 14 frequency bands (channels), which are
> dispersingwithinspectrum of 25 MHz (from 2 MHz - 27 MHz to be more

> specific) and each band has a different bandwidth. For example: 1th
> channel with 198 KHz (bandwidth), 2nd channel with 360 kHz, 3. channel
> with 650 kHz, and so on.
>
>
>
> Until now, I have tried 3 scenarios on GRC in order to get these 14
> channels and verify that the first step of my project (filtering) is
> working.  For testing, I used just 4 of the 14 channels to see its
> functionality and CPU requirement.
>
>
>
> General configuration:
>
>
> USRP N200 ----------- channelizer --- [ch1]           -----GUI FFT Sink
>
>                                                 ----[ch2 - ch4]   ----
> Null Sink
>
>
> USRP setup ->  samp_rate= 25 MHz, and Center Freq = 14,2 MHz.
>
>
> Scenario 1: channelizer = 4 band pass filters.
>
> Scenario 2: channelizer = 4 Xlating FIR filters.
>
> Scenario 3: channelizer = Polyphase channelizer,  5 equal channels of 5 MHz.
>
>
>
> For the 3 configurations I got massive “DDDDD..” at the console output.
> Moreover:
>
> Scenario 1:  CPU 100% and stop the application.
>
> Scenario 2:  CPU between 75 % and 95 %.
>
> Scenario 3:  CPU between 53 % and 95 %
>
>
>
> Therefore, I really appreciate if you could give me some tips to avoid
> this massive “DDD” messages or alternatives to optimize the resource
> consumption for the filter bank, due to the results showed that the band
> pass filter (scenario 1) will not be a good option for me, or maybe I
> did something wrong.
>
>
>
> In the attached files you will find the 3 different GRC configurations.
>
>
> Thanks in advance,
>
>
> Luis Grajales
>
>
>

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