Octave wrapper for rtl-sdr

Dimitri Stolnikov horiz0n at gmx.net
Fri May 25 21:42:28 UTC 2012


Hi Kire,

i just discovered your post on reddit  
http://www.reddit.com/r/RTLSDR/comments/u4pjc/measurements_of_e4000_filter_responses/

Thanks a lot for sharing your findings with the community. I'm looking  
forward to see the NF and IMD measurements :).

Also i think the octave code has definitely educational value for me  
personally and likely for everyone else as well.

Dimitri

On Mon, 21 May 2012 23:24:10 +0200, Kire Pudsje <kirepudsje at gmail.com>  
wrote:

> I wrote for myself an octave wrapper for all functions in the header
> file of the rtl-sdr library. Even the async routine generates a
> callback to octave functions. The whole is a 1-to-1 mapping of the
> functions, I tried to stay as close as possible to the C-library.
> I do not know if it just me using octave, but if there is any interest
> in this code, I could place it somewhere.
>
> sample code:
> pkg load rtlsdr
> if rtlsdr_get_device_count()>0
>     dev = rtlsdr_open(0);
>     samprate=2048e3;
>     nsamples=2048;
>     rtlsdr_set_sample_rate(dev, samprate);
>     rtlsdr_set_center_freq(dev, 100e6);
>     rtlsdr_set_tuner_gain_mode(dev, 0);
>     rtlsdr_reset_buffer(dev);
>     buf = rtlsdr_read_sync(dev, nsamples * 2);
>     d = (double(buf) - 128) / 128.0;
>     d = d(1:2:end) + 1i * d(2:2:end);
>     f = (-.5:1/nsamples:.5-1/nsamples) * samprate;
>     plot(f, 20*log10(abs(fftshift(fft(d .* blackman(nsamples)') /  
> nsamples))));
>     rtlsdr_close(dev);
> end




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