Alfred reply is exactly why I would like to change the sample rate. I am operating at low frequency and would like to be able to look at the signal with a different resolution in the frequency domain (time span = 1/sampling rate, require ring more points in FFT to get resolution). In my career I have done lots of FIR filter design using Surface Acoustic Wave technology and changing the sample rate and number of points was a very important tool. As you know, with FFT you get images folding back into the spectrum (aliasing). Changing the sample rate moves those images to different locations.
I will check out using further decimation filtering. Any information on the use of decimation filtering would be appreciated. Thanks, Mike -----Original Message----- From: Robert McGwier [mailto:[EMAIL PROTECTED] Sent: Monday, November 14, 2005 6:34 PM To: Alfred A. Aburto Jr. Cc: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Reducing the ADC sample rate The reason Matt, Eric, and I are questioning this is that the resampling done in software, is quite nice and completely adequate for this task. Bob Alfred A. Aburto Jr. wrote: > > Matt Ettus wrote: > >>> Is there any other way to decrease the sample rate beside the >>> decim_rate? >>> >> >> >> Why would you want to do that? >> >> Matt >> >> >> > It may not be easy to do hardware wise, but just shifting the sample > rate to fit ones bandwiidth (FFT size and resolution, ...) of interest > seems ideal to me. This is often a problem in biological acoustics for > example because one needs a wide variety of bandwidths for different > species from blue whale to bat, but A/D cards are made at specific > sample rates often not quite meeting the requirements of bandwidth and > resolution ... no doubt similar problems exist in the electromagnetic > spectrum. > Al > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Laziness is the number one inspiration for ingenuity. Guilty as charged! _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
