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Re: [Discuss-gnuradio] synchronization between blocks


From: Nemanja Savic
Subject: Re: [Discuss-gnuradio] synchronization between blocks
Date: Wed, 29 Jan 2014 18:52:01 +0100

Thank you Tom. The problem is that in the configuration that is attached delay must be arround 600 in order to allign two paths. Next I put a complex delay block in the second path just after the theottle (and removed the existing one) and it works fine with 330 (not perfectly alligned but ok). Is there any other sources of delay that should be accounted.


On Wed, Jan 29, 2014 at 4:02 PM, Tom Rondeau <address@hidden> wrote:
On Wed, Jan 29, 2014 at 4:04 AM, Nemanja Savic <address@hidden> wrote:
Hi all gnuradioers,

I have a problem to adjust delay between two paths in my flowgraph, and thus I have a question. The flowgraph is attached. As can be seen, there are two paths from the input. I would call one signal path and the other would be RSSI path. In signal path, signal is first filtered, demodulated and finally in clk_sync_... block the symbols are sliced. The second path is used only for rssi value. At the moment I have problem to adjust delay in rssi path so that correct rssi value is sampled at the moment of sampling symbol values. The only block that introduces delay is filter and it has 331 taps. So when I set delay to 331, the signal are not aligned. Is delay between this two paths constant during execution or not?

Best,


--
Nemanja Savić

Yes, the delay is constant. But you've set the wrong value. For a symmetric FIR filter like you are using, the delay is (N-1)/2.

Tom





--
Nemanja Savić

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