On Wed, 16 Mar 2005, Dinkar Bhat wrote: > I joined this group recently and have learnt a lot.
Join the crowd (that are learning a lot) > I had a rather > fundamental question. Suppose I sample the > IF output (say, centered at 40 Mhz) of a tuner/mixer tuned to a ATSC DTV > channel (6Mhz wide), and I want to detect the > pilot frequency which is added to the channel during transmission, would > I have to sample the IF > at much higher than 2*Nyquist fy? The reason I ask is that the pilot If the IF is bandlimited (say 40 +- 4Mhz) you can sample at a much lower rate using 'bandpass sampling', use a slower ADC and get fy translation at the same time. For example, a tuner we use is centered at 36Mhz, our ADC samples at 64Mhz ( < 2* IF ) but the IF appears to be at 28Mhz ( 32 - ( IF - 32 )). --Chuck _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
