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Re: [Discuss-gnuradio] Delay block controlled by input

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Delay block controlled by input
Date: Wed, 08 Oct 2014 12:07:19 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Hello Carlos,
On 08.10.2014 09:10, Carlos Alberto Ruiz Naranjo wrote:
> I generate the signal from a file (10230000 samples/s) to a file. My
> sampling clock drifts significantly :S
No. Unless I misunderstood you, you have a big misconception:
"sampling clock" is *not* the rate at which your samples pass through
your processing chain (ie. GNU Radio). It is the time base at which they
are measured, or simulated to, mathematically.
The device/software that actually captures the samples and saves them
has a fixed clock. If that clock changes too much a) compensate that in
software, if possible or b) get a better device.
This is digital signal processing. Real world time has *no* meaning
here, everything is measured relative to the interval between two
sampling times. You can process the signal as fast or slow as you want
to (as long as that doesn't lead to things like overflows), and nothing
in the processing chain should care.
> - Picture one: Counter Clock 2 is correct but Counter Clock 1 no.
> Then I should use the second configuration, but it is not allowed because I
> have a loop, right?
I don't understand your graph, sorry :(


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