Thanks, Tom. I do intend to decimate the 50MHz input by 50 to have 1MHz. Is that correct?
Also, if I take my 50MHz source USRP, and run it through the filter with decimation and low pass filter set to 15000000 (15MHz) center frequency @ 15000000 (again, 15MHz) Taps = firdes.low_pass(1, samp_rate, 15000000, 100) Will that give me a 30MHz signal to save to a data file and run back through the filter I initially asked about? Thanks. Paul B. Huter On Nov 18, 2013 9:46 AM, "Tom Rondeau" <[email protected]> wrote: > On Mon, Nov 18, 2013 at 10:35 AM, Paul B. Huter <[email protected]> > wrote: > > If I want to use a low-pass filter to look at 1MHz blocks of data, is it > > appropriate to use the following parameters: > > > > low pass filter: 500khz > > center frequency: -500khz (for 1MHz, increments of 1MHz for others) > > Taps: firdes.low_pass(1, samp_rate, 500000, 100) > > > > Paul B. Huter > > For a low pass filter, you specify the passband bandwidth, but it's a > real-valued filter, so it's symmetric about 0. So, yes, if you set the > bandwidth of the filter to 500 kHz, then the filter will filter from > -500 to +500 kHz. > > If you just want to look at 1 MHz of spectrum, I suggest you also > decimate the incoming signal so that you reduce your processing > requirements as well as filter. > > Tom >
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