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Re: [Discuss-gnuradio] gnuradio on ubuntu touch

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] gnuradio on ubuntu touch
Date: Wed, 06 Aug 2014 15:51:05 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

The overflow is not a result of buffering; in fact, buffering helps.

overflows happen because at any bottleneck in your processing chain,
samples start to stagnate, causing back pressure. When all buffers are
filled, there's nothing the rtl source can do but drop samples. That's
an overflow.

A computationally intense filter might also lead to overflows, but here
it's because your CPU can't keep up with the sample rate, whereas with
the file sink, your storage can't sustain the write rates.


On 06.08.2014 15:44, rejunte wrote:
> I tried what Vanush said and just connected RTL-SDR Source to a Null Sink and
> got no overflows. 
> I'm using a class 10 sd card, that must be the problem.
> I did some demodulation with no problem, but when I add a Low Pass Filter,
> the overflow happens again.
> Would the filter do the same thing as the file sink and buffer the data
> causing the overflow?
> --
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> http://gnuradio.4.n7.nabble.com/gnuradio-on-ubuntu-touch-tp49315p49799.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
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