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Re: [Discuss-gnuradio] Question about metadata filesink

From: Marcus D Leech
Subject: Re: [Discuss-gnuradio] Question about metadata filesink
Date: Wed, 10 Jul 2019 15:07:04 -0400

The thing to note is that the UHD sends a time stamp only on start of streaming 
and whenever there’s an overrun. 

You can know the time of any given sample by knowing the sample rate and offset 
from the beginning. 

In your case you will have to throw in some more factors to account for FFT 
size and decimation etc.

More later when I get to a real computer. 

Sent from my iPhone

> On Jul 10, 2019, at 2:54 PM, Ellie White <address@hidden> wrote:
> Hello!
> I am working on a radio astronomy project with the Green Bank
> Observatory / NRAO Central Development Lab this summer, utilizing GNU
> Radio and an Ettus Research SDR, and I've got a question regarding how
> to collect metadata information from a filesink.
> I have attached the flowgraph I am using to this email. The project
> requires that I use two computers in tandem for data collection -- one
> is connected to the Ettus -- it is the TCP server, and sends an
> interleaved data stream to the TCP client flowgraph (attached) on the
> machine which will be storing the data. As you can see, I am saving
> integrated spectra to a file. My question is simply, how do I retrieve
> a time stamp corresponding to each spectra using the metadata time
> sink? I have been fiddling with this all afternoon attempting to get
> it to work properly, and I have been able to save data to a file, read
> out spectra (using attached Python program), and display header
> information using the command gr_read_file_metadata in the terminal,
> but this is just showing me a timestamp for the beginning of the data
> collection run, rather than showing me timestamps for each spectrum
> which is saved to file, and I am not sure how to implement this.
> Any advice would be much appreciated! If I can provide any more info
> about my system or what steps I have tried, please let me know. Thank
> you so much for your time -- have a good afternoon!
> Best,
> Ellie
> <ettus-filesink.grc>
> <dataGraphing.py>
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