On Sat, 15 Jan 2011, Brian Padalino wrote: > > It's all about power, right? So you may sacrifice sample rate for > accuracy, but you can gain those bits back in the digital domain via > filtering. Only if you really want to see more than the 72dB of > dynamic range the ADC supplies do you somewhat get screwed, I think. > I've heard of people recovering very narrowband signals with > narrowband blockers where the desired signal is below the dynamic > range at their fastest sample rate, but through digital filtering were > able to bring the signal out of that noise floor. I haven't done it > myself.
Of course. This is the principle that underlies Sigma-Delta ADCs. In my view wider bandwidth and lower resolution is the way to go because it gives the user a usefull trade off. That is, the user can opt for a full bandwidth of F_s / 2 at the ADC's resolution or a narrower bandwidth with processing gain. The processing gain is F_s / (2 * B) where B is the bandwidth of the discrete filter. Having said that it is usefull to maximize 2 * F_s / b with respect to purchase cost where b is the number of ADC bits. Cheers -- Peter F Bradshaw: http://www.exadios.com (public keys avaliable there). Personal site: http://personal.exadios.com "I love truth, and the way the government still uses it occasionally to keep us guessing." - Sam Kekovich. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
