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Dimitri Stolnikov horiz0n at gmx.netHi 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