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| From: | Bruno Alvim |
| Subject: | Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 184, Issue 11 |
| Date: | Mon, 12 Feb 2018 15:32:41 -0200 |
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Today's Topics:
1. Customized Block Giving Incorrect Output (Tellrell White)
2. Re: Customized Block Giving Incorrect Output (Michael Dickens)
3. Re: Customized Block Giving Incorrect Output (Tellrell White)
4. Re: Customized Block Giving Incorrect Output (Michael Dickens)
5. Re: Customized Block Giving Incorrect Output (M?ller)
------------------------------------------------------------ ----------
Message: 1
Date: Sun, 11 Feb 2018 21:00:03 -0500
From: Tellrell White <address@hidden>
To: address@hidden
Subject: [Discuss-gnuradio] Customized Block Giving Incorrect Output
Message-ID:
<CA+NbTCbGD+jHchri24HNn+BeYq9kH-UmczbueO0jtiMicHkt_w@ >mail.gmail.com
Content-Type: text/plain; charset="utf-8"
Hello Guys
I've created a customized block that takes in a number of input items and
once that number of input items surpasses a certain number, 1024 of the
input items are taken and stored into a list, and then those items are
converted to dB and lastly compared to a threshold value. If any of the
values are greater than the threshold value, a message is printed
indicating a signal is present, and if none of the values are greater than
the threshold, this is indicated with a message stating "No signal is
present". I've tested the block in both simulation and currently, I'm
testing the block over the air using the N210. The block performed
correctly in simulation, however, over the air, the block gives a response
of "no signal present" regardless of the input. The error message "
python: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0
also printed during runtime. Any suggestions are welcome. Both the
simulation flow graph and the flow graph used over the air are attached.
Tellrell White
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Message: 2
Date: Mon, 12 Feb 2018 09:42:02 -0500
From: Michael Dickens <address@hidden>
To: Tellrell White <address@hidden>, GNURadio Discussion List
<address@hidden>
Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect
Output
Message-ID:
<1518446522.348348.1267994296.address@hidden >messagingengine.com
Content-Type: text/plain; charset="utf-8"
Hi Tellrell - So I'm not sure about the non-sim error / issue, but to me
the larger question is: what are you really trying to do? If you're
trying to detect energy via converting an FFT vector output to dB and
thresholding, on a specific number of items per FFT, then why not just
use vectors throughout to guarantee the # of items is as desired? The
FFT block is, of course, vectorized; so is the "complex to ||^2" block
(or, rather it can be; you're not currently using it in this manner).
Then, you set the energy detector to take in 1 vector of length N (same-
same as the FFT and ||^2) & you're good to go. Maybe I'm missing
something? Hope this is useful. - MLD
On Sun, Feb 11, 2018, at 9:00 PM, Tellrell White wrote:
> I've created a customized block that takes in a number of input items
> and once that number of input items surpasses a certain number, 1024
> of the input items are taken and stored into a list, and then those
> items are converted to dB and lastly compared to a threshold value. If
> any of the values are greater than the threshold value, a message is
> printed indicating a signal is present, and if none of the values are
> greater than the threshold, this is indicated with a message stating
> "No signal is present". I've tested the block in both simulation and
> currently, I'm testing the block over the air using the N210. The
> block performed correctly in simulation, however, over the air, the
> block gives a response of "no signal present" regardless of the input.
> The error message " python: Fatal IO error 11 (Resource temporarily
> unavailable) on X server :0.0> also printed during runtime. Any suggestions are welcome. Both the
> simulation flow graph and the flow graph used over the air are
> attached.
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Message: 3
Date: Mon, 12 Feb 2018 10:17:23 -0500
From: Tellrell White <address@hidden>
To: Michael Dickens <address@hidden>,
address@hidden
Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect
Output
Message-ID:
<CA+NbTCaJTnJcWDGxD=9vs3ipju6xaddress@hidden >gmail.com
Content-Type: text/plain; charset="utf-8"
Michael
Thanks for the response. That's exactly what I'm trying to accomplish. You
mention the "complex to ||^2 can be vectorized. My question is how exactly
do you go about doing that?
Tellrell
On Mon, Feb 12, 2018 at 9:42 AM, Michael Dickens <address@hidden>
wrote:
> Hi Tellrell - So I'm not sure about the non-sim error / issue, but to me
> the larger question is: what are you really trying to do? If you're trying
> to detect energy via converting an FFT vector output to dB and
> thresholding, on a specific number of items per FFT, then why not just use
> vectors throughout to guarantee the # of items is as desired? The FFT block
> is, of course, vectorized; so is the "complex to ||^2" block (or, rather it
> can be; you're not currently using it in this manner). Then, you set the
> energy detector to take in 1 vector of length N (same-same as the FFT and
> ||^2) & you're good to go. Maybe I'm missing something? Hope this is
> useful. - MLD
>
> On Sun, Feb 11, 2018, at 9:00 PM, Tellrell White wrote:
>
> I've created a customized block that takes in a number of input items and
> once that number of input items surpasses a certain number, 1024 of the
> input items are taken and stored into a list, and then those items are
> converted to dB and lastly compared to a threshold value. If any of the
> values are greater than the threshold value, a message is printed
> indicating a signal is present, and if none of the values are greater than
> the threshold, this is indicated with a message stating "No signal is
> present". I've tested the block in both simulation and currently, I'm
> testing the block over the air using the N210. The block performed
> correctly in simulation, however, over the air, the block gives a response
> of "no signal present" regardless of the input. The error message "
>
> python: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0
>
> also printed during runtime. Any suggestions are welcome. Both the
> simulation flow graph and the flow graph used over the air are attached.
>
>
>
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Message: 4
Date: Mon, 12 Feb 2018 10:21:17 -0500
From: Michael Dickens <address@hidden>
To: Tellrell White <address@hidden>, address@hidden
Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect
Output
Message-ID:
<1518448877.1183410.address@hidden >messagingengine.com
Content-Type: text/plain; charset="utf-8"
In GRC, you open the "complex to ||^2" block settings & set the vector
length to whatever you want. I'd advise using a variable that's defined
in GRC, and then use it for any blocks that require the vector setting;
that way you can change the variable value & all blocks are updated with
it. Hope this is useful. - MLD
On Mon, Feb 12, 2018, at 10:17 AM, Tellrell White wrote:
> Thanks for the response. That's exactly what I'm trying to accomplish.
> You mention the "complex to ||^2 can be vectorized. My question is how
> exactly do you go about doing that?
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Message: 5
Date: Mon, 12 Feb 2018 16:36:16 +0000
From: M?ller, Marcus (CEL) <address@hidden>
To: "address@hidden" <address@hidden>,
"address@hidden" <address@hidden>,
"address@hidden" <address@hidden>
Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect
Output
Message-ID: <address@hiddenedu >
Content-Type: text/plain; charset="utf-8"
Just another thought: Why convert every single FFT output vector from
linear to dB with a logarithm (that's a very complicated function!)
just to then compare it to a threshold, if you could also just convert
the threshold to linear once?
Best regards,
Marcus
On Mon, 2018-02-12 at 10:21 -0500, Michael Dickens wrote:
> In GRC, you open the "complex to ||^2" block settings & set the vector length to whatever you want. I'd advise using a variable that's defined in GRC, and then use it for any blocks that require the vector setting; that way you can change the variable value & all blocks are updated with it. Hope this is useful. - MLD
>
> On Mon, Feb 12, 2018, at 10:17 AM, Tellrell White wrote:
> > Thanks for the response. That's exactly what I'm trying to accomplish. You mention the "complex to ||^2 can be vectorized. My question is how exactly do you go about doing that?
>
> _______________________________________________
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