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Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 178, Issue 2

From: Zenki
Subject: Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 178, Issue 2
Date: Thu, 24 Aug 2017 19:16:38 +0000

On Thu, Aug 24, 2017 at 6:05 AM <address@hidden> wrote:
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Today's Topics:

   1. Re: Doppler detection (Marcus M?ller)
   2. Qt GUI: Water falls the wrong direction (Marcus M?ller)
   3. Re: [GSoC 17] DAB: Updates (Matthias Br?ndli)


Message: 1
Date: Thu, 24 Aug 2017 10:31:03 +0200
From: Marcus M?ller <address@hidden>
To: address@hidden
Subject: Re: [Discuss-gnuradio] Doppler detection
Message-ID: <address@hidden>
Content-Type: text/plain; charset=utf-8

Dear Andrew,

Hm, this is all getting confusing; an uncommented screenshot doesn't
help. Why would you want to pull the doppler shifted signal from a plot
(which is a reduced representation of your signal), if you have access
to the original signal?

Also, you're still very much only describing in, at least for me, who
has not worked on the same radars as long as you did, admittedly, very
vague terms what you want to *do*, not *what problem* you need help with.

Can you please simply write a question that is very coherent? It might
help if you imagine you're writing to someone who has no idea of what
your signals are, or in fact, someone who's completely ignorant of
Doppler radar; we simply might not be as smart as you think we are, or
we simply might not implicitly assume the same things that you can
assume. In fact, your descriptions aren't really enlightening to us.

I know that will make your email a lot longer, but, having (hopefully)
helped quite a few people on the mailing list, taking a step back and
describing a problem from the ground up *really* makes a lot of
difference for people trying to assist you.

Best regards,



Message: 2
Date: Thu, 24 Aug 2017 12:16:51 +0200
From: Marcus M?ller <address@hidden>
To: GNURadio Discussion List <address@hidden>
Subject: [Discuss-gnuradio] Qt GUI: Water falls the wrong direction
Message-ID: <address@hidden>
Content-Type: text/plain; charset="utf-8"; format=flowed

Hi Folks,

while discussing the DABstep GUI's developer mode, we noticed that the
QT GUI Waterfall sink doesn't fully deserve that name. It's a waterrise


Is there a (maybe unexposed) property to change the direction of flow?



Message: 3
Date: Thu, 24 Aug 2017 14:35:00 +0200
From: Matthias Br?ndli <address@hidden>
To: address@hidden
Subject: Re: [Discuss-gnuradio] [GSoC 17] DAB: Updates
Message-ID: <address@hidden>
Content-Type: text/plain; charset=windows-1252

Hello Marcus, Hello all,

On 19/08/17 15:00, Marcus M?ller wrote:
> So, if you'd want to wrap that, you'd be very much more than welcome! In
> fact, I'd head over to [1], and look at mp4_encode_sb , rip out the DAB+
> specific parametrizations and put in the DRM specific ones (but I'm,
> alas, not aware which those are).

FDK-AAC defines additional AOTs that are DRM+ specific, in the same way
it does for DAB+. The code even contains some remnants of DRM+ logic,
but I cannot assess how much is missing. It should be possible to modify
the library to be compatible with both DAB+ and DRM.

The frame lengths might be the same because both use the 960 transform
length, however the framing at the output is probably different, as we
had to add the DAB+ one.

I'd be happy to accepts patches for this against the fdk-aac fork at

Supporting an open-source implementation of DRM+ is very much in-line
with the goals of the Opendigitalradio association!



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End of Discuss-gnuradio Digest, Vol 178, Issue 25
Yao-Cheng Lin
Graduate Student
School of Aeronautics and Astronautics
Purdue University

Neil Armstrong Hall of Engineering
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West Lafayette, IN 47907

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