Marcus, Thanks for reply. That is make sense, so the point become how to convert the signal to baseband.
On Fri, Jan 21, 2011 at 11:11 AM, Marcus D. Leech <mle...@ripnet.com> wrote: > On 01/20/2011 09:42 PM, James Jordan wrote: > > Hi Tom, > > This is very old topic. I have read a DSP book. But I find that I > > still not very understand channelizer. > > Why in channelizer use low pass filter, in my imagine channelizer will > > use band pass filter to filter each > > channel like that: 600Mhz baseband signal have 4 channel each channel > > have 100Khz bandwidth. > > so the channel freq is: 599.8Mhz 599.9Mhz 600Mhz 600.1Mhz. So I need 4 > > bandpass filter to filter each > > channel but actually the channelizer use lowpass filter, so why? > > > > > I know you've asked Tom, but he's on the road. I haven't looked at the > Gnu Radio channelizer, but one > way to implement a channelizer is to convert all the signals to > baseband, then low-pass filter.That > way, all channels are at baseband when you're done. > > Does that make sense? > > > > > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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