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Stefan Sydow st at metafly.infoHello Michael, Am 14.07.2012 21:23, schrieb Michael Karcher: > This filter has a quite flat passband in the interesting range for DAB > (-768kHz..+768kHz) but by far not enough attenuation at 1280kHz (which > will alias to 768kHz at a sampling rate of 2048kHz) to get satisfactory > adjacent channel rejection. The experimentally observed alias rejection > is good enough, which lead to the conclusion that there is another > low-pass filter, which might be part of the resampling unit. I've got a passband of nearly 2MHz with the original coefficients. Did I miss a factor 2 somewhere? I tried to construct a narrower filter using the gnuradio function. Here is a python script to construct the FIR register and plot the frequency response. Maybe the script is also helpful to you. Regards, Stefan -------------- next part -------------- A non-text attachment was scrubbed... Name: fir_coeff.py Type: text/x-python Size: 2520 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120715/2f94643f/attachment.py>