Hi Tom,
well, you need to fix the fact that you're trying to feed streams with different rates
into the same Visualization, that's just not /sensible/, DSP-wise. So, what's the purpose
of doing that? To me, it's quite intuitive that when I have something that shows me my
signal, and that something just gets the signal as sequence of numbers, that it's gotta be
all the same rate. But you're intentionally breaking with that notion here, so I *bet* you
have an intent there, and thus me saying "well don't do that, then" isn't going to solve
your problem.
Best regards,
Marcus
On 12.10.23 18:12, tom sutherland wrote:
Any solution to the problem of running out of date in one path?
Tom
On Thursday, October 12, 2023 at 11:02:06 AM CDT, discuss-gnuradio-requ...@gnu.org
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Today's Topics:
1. Some GRC files run with no errors but don't plot (tom sutherland)
2. Re: Some GRC files run with no errors but don't plot
(Marcus Müller)
----------------------------------------------------------------------
Message: 1
Date: Thu, 12 Oct 2023 11:36:24 +0000 (UTC)
From: tom sutherland <alphatoz...@yahoo.com>
To: "discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org>
Subject: Some GRC files run with no errors but don't plot
Message-ID: <1055450876.6185365.1697110585...@mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"
I have a simple grc file that shows the difference in Interpolation and Decimation using
the Rational Re-sampler blocks. The program runs once, a "Time Sink" shows the
signals(once) and then stops plotting and the Frequency Sink does not show a frequency
plot at all. I've had other programs that do similar things, runs but nothing shows,
once and freezes or for a few cycles and stops. Any thoughts on causes and /or how to
solve/debug it would be appreciated. I am running GRC 3.10.5.0 on a Windows 10
Enterprise 12th Gen i7 machine with 32GB RAM. I've attached the grc/py and plot files.
Thanks...Tom
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------------------------------
Message: 2
Date: Thu, 12 Oct 2023 13:59:07 +0200
From: Marcus Müller <marcus.muel...@ettus.com>
To: discuss-gnuradio@gnu.org
Subject: Re: Some GRC files run with no errors but don't plot
Message-ID: <d126e12d-4b3d-4cfa-89a1-b04489a37...@ettus.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
I think I can explain!
Both sinks need to always consume the same number of input items from all their
inputs.
So, even if you disabled the time sink, the upper sink would quickly grind to a
halt,
because the "lowest rate" Rational Resampler (interp=1,decim=4) would not be
able to
produce the samples needed to keep up with the "highest rate" resample
(interp=4,
decim=1). Both resamplers work on the same input, just that the lowest-rate one
takes 16×
the amount of input to produce the same amount of output as the highest-rate
one. Since
both share the same input, and that input has a finite buffer, this can't work
for long.
So, your flow graph has an architectural shortcoming, either way.
The time sink hits that bug you've built quicker, because it has no throttle in
the way.
Best,
Marcus
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