Re: [Discuss-gnuradio] gnuradio on ubuntu touch

[Vanush Vaswani]

On those single board computers I don't bother writing to SD. I just route it through the network (assuming large enough bandwidth) to another graph or Python script that dumps it to a disk with faster storage bus.

You can use gr-zmqblocks for that.

On Wed, Aug 6, 2014 at 11:51 PM, Marcus Müller <address@hidden> wrote:

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.

Greetings,
Marcus

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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