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Re: [Discuss-gnuradio] Streaming Funcube Dongle Pro+ over UDP

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Streaming Funcube Dongle Pro+ over UDP
Date: Sun, 11 Aug 2013 17:48:44 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8

Hi Vanush,

I was not aware of the gr-fcdproplus project; however, in practice, the only 
difference is really the 192k sampling rate of that audio device (I can't 
really see why the dl1ksv did not patch that functionality into gr-fcd, but 
that's completely his choice. It's easier, anyway, to isolate all that control 
device handling into a hardware-specific source).

Let's assume you have your file source that reads the 16 (signed) integers coming from 
the sound card; that file source should have "short" set as its output type 
(that's 16 bit :) ), as it simply reads raw bytes.
You convert those using "short to float";
I and Q samples are interleaved. So you take "Deinterleave", get two parallel 
These, you combine using float to complex.
Quite straightforward :)



On 08/11/2013 05:14 PM, Vanush Vaswani wrote:

yeah, makes sense to use OS functionality thats available.
One question - how does one pack the samples back into complex within gnuradio 
(or grc)?
FYI, I am referring to OOT block gr-fcdproplus, not gr-fcd. The funcube dongle 
pro+ has an improved quadrature sampling rate of 192 KHz.

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