|From:||Carlos Alberto Ruiz Naranjo|
|Subject:||Re: [Discuss-gnuradio] Delay block controlled by input|
|Date:||Wed, 8 Oct 2014 13:33:10 +0200|
If you don't have hardware involved, you have no 'clock'. And as such,
it can't drift.
On 10/08/2014 12:29 PM, Carlos Alberto Ruiz Naranjo wrote:
> Sorry, I have explained bad: S
> I have the signal saved in a file and 10230000 samples are one second
> (in the real world).
> In the first graph I have two clocks (counters samples). When passing
> 102300 samples it increase0.01 seconds.
> In the first watchthis time controls the position of the satellite and
> hisdelay in this time. It allows to know what signal time is passing in
> the delay block.
> But I have a problem: clock 2 (a test clock) and clock 1 haven't the
> same time; it has a drift.
> Then, I must use clock 2 (
> count the samples in the delay block output, not input). But it creates
> a loop.
> 2014-10-08 12:07 GMT+02:00 Marcus Müller <address@hidden
> 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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